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

1. Steel pans sometimes blacken because of the sulfur coming from the proteins in eggs reacting with ions to form iron (II) sulfide. The equation for the reaction is shown below. Fe (s) + S (s)  FeS (s) What mass of iron (II) sulfide is formed from using the pans to fry a hundred eggs each containing 0.032 g of sulfur? A 0.88 g B 8.8 g C 88 g D 5.6 g

2. A solution contains 8.20 g/dm3 of the acid H3ZO3. 25.0 cm3 of this solution reacted with an equal volume of 0.100 mol/dm3 NaOH. The equation for the reaction was NaOH + H3ZO3  NaH2ZO3 + H2O What is element Z? A nitrogen B phosphorus C silicon D sulfur

3. An aqueous solution of a salt was placed in a test tube and sodium hydroxide was added from a burette. The height of the precipitate formed in the tube was measured from various volumes of alkali added and a graph was shown below: height of precipitate volume of alkali added Which of the following salts would show this behaviour? I aluminium sulfate II zinc sulfate III ammonium sulfate A I only B I and II only C II and III only D I, III and III

Miracle Learning Centre Answer to Chemistry Tuition Question on Mole Concept . (O Level Chemistry Tuition/ IP Chemistry Tuition) 1.B 2.B 3.B 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.