Get Good Tutors From Best Physics Tuition in Singapore

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A Child's Guide to Tuition Center Success

Going to a tuition center may be lots of things to a toddler. they'll have lots of fun and learn lots, however there'll even be moments of worry, confusion and perhaps even defeat. There square measure lots of guides and articles out there to assist oldsters navigate the schooling expertise, however little or no info is given on to youngsters. it's them longing the expertise, therefore this guide is devoted to them.

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Open Minds Bring action

The best factor you'll do whereas attending a tuition centre is to stay your mind hospitable the ways your academics square measure exploitation to assist you learn. you will want some subjects square measure boring otherwise you might not like some activities, however you must hear your teacher and keep targeted on category regardless.

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Expect Challenge

The studies you're taking up during a tuition center should not be simple. you must expect to feel challenged and perhaps a little confused right from the primary day. If they simply offer you work that's simple, you may ne'er improve! you've got to challenge yourself and tackle issues that appear troublesome so as to beat the obstacles and extremely learn the fabric.

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Focus on Your Successes

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Types of Tutoring Services

Sometimes, you need help with a subject and don't know where to go to. Some students go for combined studies or study with their friends. However, your friends might not be there every time to help you with chemistry homework or explain a difficult chemistry concept to you. You might need to get professional tutoring to help you with your chemistry woes. Fortunately, there are a lot of options available these days which can help make the subject easier and more enjoyable for you.

Private tutoring

Private tutoring is perhaps the most sought by children and their parents for ease and convenience. The tutor is chosen by the child and parents themselves and will work according to the set timetable. The tutor can work on the weak study areas of a child thus making sure the child quickly grasp concepts and does not lag being in class. The tutor may come to your home or you may have to go to another location for tuition.

Tutoring centers

Tutoring centers can give private study lessons or tutoring sessions for small groups. If you and your friends have difficulty with a subject, you can register with a tutoring center that can teach you in a group. Some tutoring centers also provide the facility of online sessions. Students can also email or fax them the problem to receive help with the assignment. They can provide short-term or long-term teaching solutions with a wide range of subjects taught.

Online tutoring

You can also get online chemistry tutoring. Online chemistry tutoring allows you to interact one-on-one with your tutor via video-conferencing or other options. Qualified teachers can teach you no matter where you or your tutor is located. You can listen to the tutor via headset and type at the same type. Online tutoring gives you access to presentations, guest seminars, quizzes and videos to make your study more interesting. You can select your tutor online after considering all the key factors such as hourly rate, teacher's experience and his/her style of teaching. Some online tutoring services also let you take trial classes for some days before you decide you want to go for online tutoring or not.

Best Chemistry Tuition in Singapore

Miracle Learning Centre Pte Ltd started in 2008 as a centre specializing in Mathematics and Science. Centrally and conveniently located in Bukit Timah, it has seen a steady increase in the number of students yearly for all levels, with a goal of achieving excellence in Mathematics and Science subjects. Majority of our teachers are ex-school teachers who are extremely patient, caring and well-versed in their particular subject area. Parents can be rest assured knowing that our teachers will always do their best to help every student excel and improve. Miracle Learning Centre focuses mainly on the concepts at the beginning. Then we further explain the concepts through questions in the worksheets. Nearly all our teachers are ex-school teachers. Our teachers are extremely patient and caring. They are well-versed in their particular subject area and always do their best to help every student. Our class size is small and it helps us to cater to each student’s needs.

How a Tuition Centre Benefits Young Minds

There is no shame in admitting that two children given the same opportunity at an education may end up with very different results. Not every child will learn the same way or at the same pace. In some situations, they need a little help to get along. Some parents seek to place their children in exclusive schools. For most, test scores are an indicator as to whether that child will qualify for admission. Maybe a student has most of the basics down, but science is too hard. Enhancing their knowledge will benefit them greatly when it comes time to take entrance exams. This is where a good tuition centre provides an excellent start to a child's education.

One of the first things that bring the thought of a tuition centre to mind is when a child brings home poor grades. If the child and their teacher are not able to work well together, consider switching the classroom. If there is still an issue with the level of learning, decide whether outside help is necessary. There may be just one subject that leaves a student scratching their heads in confusion, but this issue may extend to a variety of subjects. Children take on embarrassment quite readily when singled out. While attending a tuition centre, they are surrounded by other students who suffer from similar learning problems. Knowing they are not alone helps ease the transition and increases learning potential.

Parents who have attempted to resolve the issues of learning on their own find that it is harder. Children often respond well to outside influences. Tutors are able to best teach a child the study skills and critical thinking skills necessary to further their education. Class size is also important. Nurturing students individually is impossible in classes where overcrowding is normal. A learning centre that focuses on a small student to teacher ratio will see their pupil success rates skyrocket.

The key idea when looking for a tuition centre is to make sure the staff is well educated. Show no fear in asking for references. Also request test score results to see what the percentage of improvement is among current and former students. Ensure that the subject in which a child needs the most assistance is available. There are some centres that focus on just a few subjects. If the syllabus does not take care of the area most needed, look for another centre that addresses that subject.

Miracle Learning Centre Physics Tuition Question on Sound. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

The figure below shows the oscilloscope trace from a concrete slab without any cavity. The pulses are obtained from the receiver. The voltage-gain of the oscilloscope is set at 2 mV/division and the time base at 0.05 ms/division.

(a) What is ultrasound? ………………………………………………………………………………………………. ……………………………………………………………………………………………….

(b) Estimate the time represented by the distance between pulses X and Y. time : …………………………..

(c) What does the time calculated in part (b) represent? ………………………………………………………………………………………………. ……………………………………………………………………………………………….

(d) Calculate the thickness of the concrete slab if the speed of ultrasound in concrete is 4 000 m/s. thickness : …………………………..

(e) What are the peak voltages of pulses X and Y? X : ………………………….., Y : …………………………..

(f) Why is pulse Y shorter than pulse X? ………………………………………………………………………………………………. ……………………………………………………………………………………………….

(g) The oscilloscope is detached from the concrete slab and connected to an alternating current (a.c.) generator, as shown below.

Miracle Learning Centre Science Tuition Question on Food Chain/Web. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

1 The cane toad, a native of Africa, was introduced into the sugar cane plantations of Australia. The cane toad has the following characteristics:

• It was able to adapt to many different environmental conditions. • It has a poison in its skin, which is deadly to predators. • A single female can produce 30 000 eggs in one year. • It can live up to 30 years. • The cane toad was thought to provide an effective agent for a biological method of pest control. The food web below shows the feeding relationships in the sugar cane plantation.

(a) Based on only the food web shown above, give one reason why the cane toad was an effective agent for a biological method of pest control. ________________________________________________________________ ______________________________________________________________[1]

(b) State two advantages of using the cane toad to control the sugar cane pests compared to using a pesticide. ________________________________________________________________ ______________________________________________________________[2]

(c) After using the cane toad for some time, scientists realised that they had upset the ecosystem in the plantations. Suggest two populations of organisms that were affected and how the cane toads affect these populations. ________________________________________________________________ ________________________________________________________________

(d) Scientists are carrying out genetic engineering to make the sugar cane plant itself resistant to pests. (i) Explain what is meant by the term genetic engineering. ________________________________________________________________ ______________________________________________________________[1] (ii) Describe how genetic engineers can produce pest-resistant sugar cane plants once they found the pest-resistant gene. ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ______________________________________________________________[5] [Total: 13]

Miracle Learning Centre Answer to Science Tuition Question on Food Chain/Web. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

Learn from our Science Tuition Questions and Answers. Miracle Learning Centre Call 6463 8756 or sms 8128 8342/9839 9908. (Specialist in Science and Maths) for Primary, Secondary and JC levels. Miracle Learning Centre specialises in Science tuition, Maths tuition, Chemistry tuition and Physics tuition classes.

Best Chemistry Tuition in Singapore

To get a well read chemistry tutor can be one of the most important steps for getting good grades in chemistry. As far the Singapore education system is concerned the grade which you get at every level will take you to the next level. If you have decided to make a build a career in science then Chemistry would play an important role and in order to get the knowledge of the concepts you need to get the services of the teacher who holds very good knowledge in the subject. Parents often face this issue that their children do not score well in spite of regular attendance and proper notes in school. This is because they lack the proper knowledge of the subject which can only be attained if proper guidance is given.

Individual chemistry tutor Singapore

It is impossible to reach full potential on a subject without understanding it to the fullest. The approach which is involved in the individual chemistry tutor will cover the concept of each question along with the brief explanations and details in accordance with the syllabus.

This approach includes discussion with the students regarding their strength and weaknesses. The students would ideally learn effective methods of study, official course syllabus and answering skills.

Best chemistry tutor Singapore

Moreover a professional tutor should have expertise in providing Physics and Chemistry tutorials .The student should be able to understand the questions and should not only memorize or learn by heart the steps of answering the questions.

Best Chemistry Tuition in Singapore

Miracle Learning Centre Chemistry Tuition Question on Electrolysis. (O Level Chemistry) Write the answers in the blanks provided.

1 A constant current was passed through aqueous copper (II) sulfate using inert electrodes as shown in the diagram. (a) Name a suitable material for the inert electrodes. ……………………………………………………………………………… (b)(i) At which electrode was copper deposited? ……………………………………………………………………………… (ii) Write an equation to represent the above reaction. ……………………………………………………………………………… (c)(i) What was observed at the other electrode? ………………………………………………………………………………

(ii) Write an equation to represent the reaction happening at this electrode. ……………………………………………………………………………… The electrode at which the copper was deposited was removed at intervals, washed, dried and weighted. The results are shown in the table below. Time / min Mass of cathode / g Total increase in mass / g 0 7.55 0.00 10 8.00 0.45 20 8.45 0.90 30 8.90 40 9.35 50 9.80 60 9.80 (d) (i) Complete the table by calculating the total increase in mass after each 10 minute interval. ……………………………………………………………………………… (ii) Plot a graph showing the increasing mass of the cathode over time.

iii) How long did it take for 1.60g of copper to be deposited? ………………………………………………………………………………

(iv) Suggest why the last two readings were the same. ……………………………………………………………………………… Answer 1a) Carbon; or Platinum; (b)(i) B; (ii) Cu2+ + 2e → Cu; (c)(i) Bubbles of gas; (ii) 4OH- → 2H2O + O2 + 4e (d)(i) 1.35, 1.8, 2.25, 2.25; (ii) 1 mark for correct plotting of points; (iii) 36 – 37 min; (iv) No more copper is being deposited; Learn from our Chemistry Tuition Question and Answers. Miracle Learning Centre Call 6463 8756 or sms 9839 9908. (Specialist in Science and Maths)

Learn The Importance of Physics Tuition in Singapore

With the constant developing of modern technology in Singapore, physics tuitions (basic, combined chemistry-physics, O level and other levels of studying it) are a top priority in the Singapore curriculum. This is due to the top grade that it has as a subject needed in getting qualification for scientific based diplomas not to mention careers. The training and its various areas of study are revised to take account of any new developments. This is required to lead to new discoveries that can change up the course of life in Singapore and the wide world at large.

It is a science that typically tries to depict how nature functions using mathematics. Physics tuition describes as coaching of physics in a learning school by a highly trained tutor. Combined chemistry-physics tuition is a phrase that identifies as a mix of chemistry and physics as course taught in a learning institute by a veteran educator. O level physics tuition identifies as mentoring of physics in a learning institution at the O level of learning. These are generally some of the value of the different physics' variation in Singapore Evolution of Modern technology.

Reliance on technology in Singapore has its foundation in it. A wide range of technologies that are evolving Singapore can be traced to the importance that comes along with physics analysis. As an example, scientific studies on semiconductors have been a roaring success such that they compose the main component of the majority electronic devices from computers to robots and communication systems. As the advancement of major electronics, physics comes hardy to further improve such discoveries with new breakthrough discoveries.

Advancement of problem-solving skillsets

A physics learner commonly comes with superb quantitative, analytical, and problem solving skillsets. Those students hold the capability to analyze and synthesize large volumes of data and send out their deep study in an easily understandable nature. When confronted with a given problem, such students they are taught how to consistently key out all factors that add to the presence of the problem and figure out how those elements interact in so as to solve the problem at hand. These are highly helpful skills which can be applied in many careers. More significantly, many employers in Singapore are starting to identify this reality and are therefore taking into consideration hiring graduates who've been trained in various levels of studying it.

It is a fact that different degrees of physics tuition in Singapore and the entire world are very tough. Students face loads of pressure when pursuing various courses so that they can earn good grades. With the toughness that comes together with physics, they may often choose other courses and subjects over it. Nevertheless, it is of uttermost importance to always keep in mind the benefits which come along with studying it at school. Students who have ambitions of being involved in developing various technologies are therefore advised to learn it.

Miracle Learning Centre Science Tuition Question on Wave Properties. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

1. The following diagram shows the full-sized plan view of a water-filled pool after a stone was dropped at point C. A water wave with a frequency of 5.0 Hz and an amplitude of 2.0 cm was formed.

a) On the grid below, draw the displacement-time graph of the above water wave. Number the axes clearly. Your diagram should show two complete cycles.

b) Water waves are transverse waves. Explain what you understand by “transverse waves”. _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________

c) Determine the wavelength and the speed of the water wave.

2. (a The figure shows the graph of the variation of the displacement of a wave with distance along the wave at a particular time. State the value for

(i) the amplitude of the wave. ____________________________________________________ (ii) the wavelength of the wave. ____________________________________________________

(b) The figure below shows the graph of the variation of the displacement of the same wave with time at a particular point along the wave. State the value for (i) the period ____________________________________________________ (ii) the frequency of the wave. ____________________________________________________ (iii) Hence, calculate the speed of the wave drawn in the two figures above.

Miracle Learning Centre Answer to Science Tuition Question on Wave Properties. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition) 1. a) Correct height. Correct width At least 2 waves and good scale b) Transverse waves travel in a direction that is perpendicular to its direction of vibrations. b) Wavelength = 1.0 cm v = f x λ = 5.0 x 1.0 = 5.0 cm/s 2.(ai) 0.6 m (aii) 5.0 m (aiii) 1.25 s (aiv) f = 1/T = 1/1.25 = 0.8 Hz (av) v = fλ = 0.8 x 5.0 = 4 m/s Learn from our Science Tuition Questions and Answers. Miracle Learning Centre Call 6463 8756 or sms 8128 8342/9839 9908. (Specialist in Science and Maths) for Primary, Secondary and JC levels. Miracle Learning Centre specialises in Science tuition, Maths tuition, Chemistry tuition and Physics tuition classes.

Miracle Learning Centre Chemistry Tuition Question on Energy Changes. (O Level / IP Chemistry)

1. Hydrazine, N2H4 is commonly used as a rocket fuel. Ethanol is also a fuel which can be in cars. (a) (i) Draw a ‘dot and cross’ diagram to show the bonding in hydrazine. Your diagram should show all the electrons present.

(ii) The combustion of one mole of hydrazine produces nitrogen and water vapour as the only products. The overall energy change is 662 kJ/mol. Construct a labelled energy level diagram for the combustion of hydrazine.

(b) (i) Write down a balanced chemical equation (with state symbols) showing the complete combustion of ethanol.

(ii) Calculate the overall energy involved in the combustion of 1 mole of ethanol using the table of bond energies as shown.

(iii) Discuss if hydrazine or ethanol is a better fuel.

Miracle Learning Centre Answer to Chemistry Tuition Question on Energy Changes. (O Level / IP Chemistry)

(b) (i) C2H5OH (l) + 3O2 (g)  2CO2(g) + 3H¬2O(l)

(ii) Energy absorbed during bond breaking = 5(412) + 348 + 360 + 464 + 3(496) = 4720 kJ/mol Energy released during bond forming = 2(2)(774) + 3(2)(464) = 5880 kJ/mol Enthalpy change = 4720 – 5880 = - 1160 kJ/mol

(iii) Ethanol is a better fuel as it releases more energy than hydrazine when burnt.

Learn from our Chemistry Tuition Questions and Answers. Miracle Learning Centre Call 6463 8756 or sms 8128 8342/9839 9908. (Specialist in Science and Maths) for Primary, Secondary and JC levels. Miracle Learning Centre specialises in Chemistry tuition, Physics tuition, Maths tuition and Science tuition Classes.

Miracle Learning Centre Chemistry Tuition Question on Redox Reactions. (O Level / IP Chemistry)

1 (a) A sample of manganese oxide was analysed and it was found that 11.0 g of manganese had combined with 4.8 g of oxygen. Find the empirical formula of the oxide.

(b) The reaction between manganese (IV) oxide and concentrated hydrochloric acid produces chlorine gas. MnO2 + 4 HCl MnCl2 + Cl2 + 2 H2O

(i) In terms of changes in oxidation states, state and explain which substance is behaving as an oxidising agent in this reaction. ……………………………………………………………………………..………... ……………………………………………………………………………………..
(ii) Explain how aqueous potassium iodide can be used to confirm that manganese (IV) oxide is an oxidising agent. ……………………………………………………………………………..………... ……………………………………………………………………………………..
(iii) 50 cm3 of chlorine gas was produced in the reaction at room temperature and pressure. What was the mass of MnO2 used?

(iv) The chlorine gas produced is bubbled into a solution of sodium bromide. Write an ionic equation for the reaction and describe the observations that will be made. ……………………………………………………………………………..………... ……………………………………………………………………………..………... ……………………………………………………………………………………..
Miracle Learning Centre Answer to Chemistry Tuition Question on Redox Reactions. (O Level / IP Chemistry) 1 (a) Mass (g) No. of moles Simplest ratio Mn 11.0 0.2 1 O 4.8 0.3 1.5 Empirical formula: Mn2O3

(b) (i) MnO2. The oxidation state of Mn decreases from +4 in MnO2 to +2 in MnCl2. Oxidising agents are reduced during reaction.
 (ii) KI is a reducing agent. The presence of an oxidizing agent like MnO2 will oxidize KI, causing it to turn from colourless to brown.
 (iii) No. of moles of Cl2 = (50/1000)/24 = 2.0833 x 10-3 No. of moles of MnO2 = 2.0833 x 10-3 Mass of MnO2= 2.0833 x 10-3 X (55 + 2 x 16) = 0.181g (to 3 s.f.)
 (iv) Cl2 + 2Br -  Br2 + 2Cl- The colourless solution will turn reddish-brown. Learn from our Chemistry Tuition Questions and Answers. Miracle Learning Centre Call 6463 8756 or sms 8128 8342/9839 9908. (Specialist in Science and Maths) for Primary, Secondary and JC levels. Miracle Learning Centre specialises in Chemistry tuition, Physics tuition, Maths tuition and Science tuition Classes.

Miracle Learning Centre Physics Tuition Question on Practical Electricity. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

Fig 11.1 shows a plug fitted with a 13 A fuse.

(i) Explain why a fuse is included the plug. [1] ……………………………………………………………………………..…………………………………………………………………………….. (ii)What is wrong with the way this plug has been wired and how should the mistake be rectified? [2] ……………………………………………………………………………..…………………………………………………………………………….. ……………………………………………………………………………..

Fig 11.2 shows a metal electric kettle which can be used to boil water. The power rating of the kettle is 0.5 kW.

Which part of the kettle should be connected to the earth pin of the plug? [1] ………..…………………………………………………………………………….

Water of mass 0.80 kg, at a temperature of 25°C is to be heated. Calculate the time taken for the water to be heated to a temperature of 90°C. [3] (Take specific heat capacity of water to be 4200 J/kg/°C)

State one assumption that you made in (ii). [1]

The cost of 1 kWh of electrical energy is 25 cents. How much will it cost to operate the heater for 45 minutes. [2]

Miracle Learning Centre Answer to Science Tuition Question on Practical Electricity. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition) 1 (a)(i) When the current flowing in the live wire is higher than the fuse rating, it will melt and stop current flow and protect the appliance from overheating [A1] (ii) The fuse is connected to the neutral wire [A1]. The fuse should be connected to the live wire. [A1] (b)(i) Metal casing/body of the kettle. [A1] (ii)

(iii) No heat loss to surroundings [A1].

(iv)

Learn from our Science Tuition Questions and Answers. Miracle Learning Centre Call 6463 8756 or sms 8128 8342/9839 9908. (Specialist in Science and Maths) for Primary, Secondary and JC levels. Miracle Learning Centre specialises in Science tuition, Maths tuition, Chemistry tuition and Physics tuition classes.

Miracle Learning Centre Physics Tuition Question on The D.C motor (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

1) The figure shows a cross-sectional view of a simple d.c. motor. The circles represent the sides of a rectangular coil which is placed between the poles of a permanent magnet. The current in the right-hand side of the coil flows into the diagram; the current in the left-hand side of the coil flows out of the plane of the diagram.

a Draw lines to indicate the direction of the force experienced by each side of the coil. [2] b Explain how the forces you have shown in a make the coil rotate. [2] ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. c State two ways in which the turning effect experienced by the coil could be increased. In each case, explain why the turning effect is increased. [4] ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. d State two ways in which a practical motor will be different from the simple motor drawn in the figure above. [2] ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. …………………………………………………………………………………………..

Miracle Learning Centre Answer to Science Tuition Question on The D.C motor. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

The figure shows a cross-sectional view of a simple d.c. motor. The circles represent the sides of a rectangular coil which is placed between the poles of a permanent magnet. The current in the right-hand side of the coil flows into the diagram; the current in the left-hand side of the coil flows out of the plane of the diagram.

Draw lines to indicate the direction of the force experienced by each side of the coil. [2] 1 mark each for correct direction of arrow (ii) Explain how the forces you have shown in i make the coil rotate. [2]

(iii) State two ways in which the turning effect experienced by the coil could be increased. In each case, explain why the turning effect is increased. [4]

(iv) State two ways in which a practical motor will be different from the simple motor drawn in the figure above. [2]

Miracle Learning Centre Chemistry Tuition Question on Organic Chemistry. (O Level / IP Chemistry)

1. Hydrogen gas is required in the production of margarine. The word equation for the production of margarine is shown below: Vegetable oil + Hydrogen gas  Margarine Which of the following options correctly lists the nature of vegetable oil, the type of reaction occurring and the catalyst used? Nature of vegetable oil Type of reaction Catalyst used A. unsaturated compound substitution reaction manganese(IV) oxide B. saturated compound addition reaction phosphoric acid C. saturated compound substitution reaction iron D. unsaturated compound addition reaction nickel

2. The fermentation of glucose can produce ethanol. Why must the temperature be kept at approximately 37C? A. Ethanol has a low boiling point and is volatile. B. The living enzymes will be destroyed at a higher temperature. C. Oxygen may diffuse into the mixture if the temperature is too cold. D. The speed of reaction will be too fast to control.

3. Ethanoic acid and propanoic acid are members of the same homologous series of carboxylic acids. Which one of the following is not the formula of another member of this homologous series? A. C4H9CO2H B. C11H23CO2H C. C17H33CO2H D. C20H41CO2H

Miracle Learning Centre Answer to Chemistry Tuition Question on Organic Chemistry. (O Level / IP Chemistry) 1)D. Vegetable oil is an alkene. It undergoes addition reaction to form an alkane. The conditions needed for this hydrogenation reaction is 2000C and Ni catalyst. 2)B. 3)C. Learn from our Chemistry Tuition Questions and Answers. Miracle Learning Centre Call 6463 8756 or sms 8128 8342/9839 9908. (Specialist in Science and Maths) for Primary, Secondary and JC levels. Miracle Learning Centre specialises in Chemistry tuition, Physics tuition, Maths tuition and Science tuition Classes.

Miracle Learning Centre Chemistry Tuition Question on Atoms. (O Level Science Tuition /IP Science Tuition /Secondary Science Tuition)

1. The ion of element A contains 12 protons, 12 neutrons 10 electrons. (a) How is an ion formed? (b) Which particles in this ion have (i) a positive charge (ii) no charge (c) What is the nucleon number (mass number) of the ion? (d) Use the Periodic Table to identify element A. (e) What is the number of electrons present in element A? (f) Draw the electronic structure for this ion. (g) A student claimed that element A can exist as molecules. Do you agree? Explain your answer.

2. Use the data in the table to answer the questions that follow.

(a) Which substance is a solid at a temperature of 20°C and a liquid at a temperature of 150°C? ____________________________________________________________

(b)(i) Which substance is a gas at a temperature of –250°C? ____________________________________________________________ (ii) Which of the following diagrams, A – D best represents the structure of a molecule of the substance you have named in (b)(i)? Answer = _____________ (c) How many atoms are there in one ethanol molecule? ____________________________________________________________ (d) State one similarity and one difference between the molecules of hydrogen and hydrogen chloride. ____________________________________________________________ ____________________________________________________________ ____________________________________________________________

Miracle Learning Centre Answer to Science Tuition Question on Atoms. (O Level Science Tuition /IP Science Tuition /Secondary Science Tuition) 1(a) Ion is formed when an atom loses electron or gains electrons (b)(i) Protons (ii) Neutrons (c) 24 (d) Magnesium

2(a) Iodine (b)(i) Hydrogen (ii) B (c) 9 (d) Similarity: both are diatomic molecules / each molecule is made up of 2 atoms chemically combined together. Differences: made up of different atoms of elements. Learn from our Science Tuition Questions and Answers. Miracle Learning Centre Call 6463 8756 or sms 8128 8342/9839 9908. (Specialist in Science and Maths) for Primary, Secondary and JC levels. Miracle Learning Centre specialises in Science tuition, Maths tuition, Chemistry tuition and Physics tuition classes.

Miracle Learning Centre Science Tuition Question on Kinetic Theory. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

1. The diagram shows a car traveling at a constant speed of 30 m/s on a level road. At this speed the car has to overcome a total force of 600 N opposing the car.

a) State the value of the driving force produced by the engine for a constant speed of 30 m/s. _________________________________________________________

b) Explain why the car slows down when it climbs a hill, even though the driving force is unchanged. _________________________________________________________ _________________________________________________________ _________________________________________________________

c) When on the level road and travelling at 30 m/s, the driving force is removed and the car starts to decelerate. If the mass of the car is 800 kg, calculate the deceleration of the car due to the opposing force.

2. A gas in an enclosed container is heated uniformly. Assuming the volume of the container is constant, use the kinetic theory to explain the effect of this heating on the pressure which the gas exerts on the container. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________

Miracle Learning Centre Answer to Science Tuition Question on Kinetic Theory. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition) 1. a) 600 N b) Some of the kinetic energy is converted into gravitational potential energy. c) Deceleration = Retarding Force / mass = 600 / 800 = 0.75 m/s2 2. When the gas in a container is heated, the gas particles gain kinetic energy and move more rapidly. Thus, they hit against the walls of the container with greater force AND greater frequency. As p = F/A, the pressure exerted on the walls of the container rises. Learn from our Science Tuition Questions and Answers. Miracle Learning Centre Call 6463 8756 or sms 8128 8342/9839 9908. (Specialist in Science and Maths) for Primary, Secondary and JC levels. Miracle Learning Centre specialises in Science tuition, Maths tuition, Chemistry tuition and Physics tuition classes.

Miracle Learning Centre Science Tuition Question on Thermal Energy (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

1) The figure below shows two identical glass cylinders containing equal volumes of water, initially at room temperature. Identical electric heaters were placed in the cylinders, near the top in cylinder A and near the bottom in cylinder B.

The heaters were switched on at the same time. The readings of the thermometers then changed as shown in the figure below.

a) Explain how heat is spread in a liquid by convection. _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________

b) On the figure above, label A or B to indicate the heating curves for the corresponding cylinders. Explain why one cylinder has a slower rate of increase in temperature than the other. _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________

2) A baby’s milk bottle containing some milk is heated in a bottle warmer. The bottle warmer has foam filled walls and a shiny outer casing as shown.

The warmer is heated by a 100 W heating element. The heating element raises the temperature of the water in the warmer to 40°C. (a) State the difference between the terms ‘thermal energy’ and ‘temperature’. …………………………………………………………………………………….. …………………………………………………………………………………..

(b) Explain why the rate of thermal energy loss from the bottle warmer can be reduced by (i) the foam filled walls, and ……………………………………………………………………………… (ii) the shiny casing. ………………………………………………………………………………

(c) The warmer contains 0.50 kg of water at a temperature of 25°C. The warmer is set to switch off when the water reaches 40°C. When there is no bottle in the warmer, calculate the time taken to raise the temperature of the water to 40°C. (specific heat capacity of water = 4200 J/(kg°C)) time taken = ……………………..

(d) Give a reason why the water will take a longer time to heat up in reality compared to the answer you obtained in (c). …………………………………………………………………………………….. …………………………………………………………………………………..

Miracle Learning Centre Answer to Science Tuition Question on Thermal Energy. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition) 1. a) When a liquid is heated, it expands and its density decreases. Hence, it floats up and colder liquid, which is denser, sinks to take its place, thus forming convection currents. b) A has the gentler curve. The temperature of A increases slowly as the heat from the heater can only reach the bottom of the container by conduction. As liquids are poor conductors of heat, the temperature of A increases slowly.

2) A baby’s milk bottle containing some milk is heated in a bottle warmer. The bottle warmer has foam filled walls and a shiny outer casing as shown.

The warmer is heated by a 100 W heating element. The heating element raises the temperature of the water in the warmer to 40°C.

(a) State the difference between the terms ‘thermal energy’ and ‘temperature’. Temperature is a measure of degree of hotness of a body. Thermal energy of a body represents the total kinetic energy of the atoms or molecules in the body.

(b) Explain why the rate of thermal energy loss from the bottle warmer can be reduced by (i) the foam filled walls, and Foam contains trapped air and air is a poor conductor of heat. (ii) the shiny casing. Shiny surfaces are poor emitters of radiant heat.

(c) The warmer contains 0.50 kg of water at a temperature of 25°C. The warmer is set to switch off when the water reaches 40°C. When there is no bottle in the warmer, calculate the time taken to raise the temperature of the water to 40°C. (specific heat capacity of water = 4200 J/(kg°C)) time taken = …………………….. (d) Give a reason why the water will take a longer time to heat up in reality compared to the answer you obtained in (c). There is some heat loss to the surroundings by convection. Learn from our Science Tuition Questions and Answers. Miracle Learning Centre Call 6463 8756 or sms 8128 8342/9839 9908. (Specialist in Science and Maths) for Primary, Secondary and JC levels. Miracle Learning Centre specialises in Science tuition, Maths tuition, Chemistry tuition and Physics tuition classes.