Miracle Learning Centre

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.