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Unit 1 Revision: Reaction Rates

Unit 1 Revision: Reaction Rates. Q.1 When green copper carbonate is added to hydrochloric acid solution a rapid reaction takes place in which a gas is given off and a blue solution is formed. Give two pieces of information which would prove that a chemical reaction had taken place.

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Unit 1 Revision: Reaction Rates

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  1. Unit 1 Revision: Reaction Rates Q.1 When green copper carbonate is added to hydrochloric acid solution a rapid reaction takes place in which a gas is given off and a blue solution is formed. Give two pieces of information which would prove that a chemical reaction had taken place. Answer:- 1) In the reaction a gas is formed. 2) In the reaction there is a colour change – the green copper carbonate changes to a blue solution.

  2. Q2. When silvery magnesium ribbon is burned in air the magnesium combines with oxygen in the air to form white magnesium oxide. In the reaction heat and light energy are given out. (a) Give two pieces of information that shows that a chemical reaction has taken place. (b) What word is used to describe a reaction in which energy is given out? (c) Write a word equation for the reaction. Answers:- • 1. Colour change (Silver magnesium to white powder). 2. Energy given out. (b) Exothermic. (c) Magnesium + Oxygen  Magnesium oxide Burning magnesium in air

  3. Q3.Barium chloride and sodium sulphate solutions are both colourless. When the two solutions are mixed a white solid called barium sulphate is formed. (a) Give one piece of information which shows that a chemical reaction had taken place. (b) Which of the chemicals mentioned is the precipitate? Answers:- (a) Solid being formed in the reaction when the chemicals present in the two solutions react together. (b) The barium sulphate is the precipitate. A precipitate is an insoluble solid formed when two solutions are mixed. Mixing solutions of barium chloride and sodium sulphate

  4. Q4. (a) Identify the two experiments which can be used to investigate the effect of concentration on the rate of the reaction. (b) Identify the experiment with the fastest reaction rate. Answers • C and D. (b) F

  5. Q5. Matthew added manganese dioxide to hydrogen peroxide solution, oxygen was produced. Manganese dioxide is a catalyst. (a) What is the purpose of a catalyst? (b) What will be the mass of the manganese dioxide at the end of the reaction? (c) What would happen to the rate at which oxygen gas is given off if the temperature was raised to 35oC? Answers: (a) A catalyst speeds up a reaction. (b) 0.1 g (A catalyst is not used up in a reaction). (c) The rate of oxygen gas production will increase.

  6. Q6 . Zinc reacts with dilute sulphuric acid. Identify the two factor which will speed up the reaction. A Using a larger volume of acid B Diluting the acid with water C Using a larger beaker D Heating the acid E Using a catalyst Answers:- D and E.

  7. Samples of three metals were each heated and placed in jars of oxygen. The correct order of reactivityof the metals, putting the most reactive first is A 1, 3, 2 B 1, 2, 3 C 2, 3, 1 D 2, 1, 3

  8. Unit 1 Revision: Chemical structures Q.1 Answer:-

  9. Unit 1 Revision: Chemical structures Which of the following metals would be a solid at 1000o C? ( You may wish to use page 5 of the data booklet to help you) A aluminium B calcium C iron D magnesium Answer:-

  10. Unit 1 Revision: Chemical structures Q.1 Answer:-

  11. Unit 1 Revision: Chemical structures Q.1 Answer:-

  12. Unit 1 Revision: Chemical structures Q.1 Answer:-

  13. Unit 1 Revision: Chemical structures Q.1 Answer:-

  14. Unit 1 Revision: Acids and Bases Q.1 Answer:-

  15. Unit 1 Revision: Acids and Bases Which of the following is formed when dilute hydrochloric acid is added to potassium hydroxide solution A water B oxygen C hydrogen D carbon dioxide Answer:-

  16. Unit 1 Revision: Acids and Bases Q. A student used pH paper and a colour chart to find the pH of some household substances. The results table is shown below. Give the entry for the pH of water. 1 How was the colour chart used to give a pH value? 1 Answer:-

  17. Unit 1 Revision: Acids and Bases The graph shows that the level of carbon dioxide in the atmosphere is falling. The government has set targets to reduce carbon dioxide levels. Why is it important to reduce carbon dioxide levels in the atmosphere? 1 In what year will the government reach its target? 1ps Answer:-

  18. Unit 1 Revision: Acids and Bases The table shows the pH values of some common solutions. Name the two acids. 1ps Name the solution which is neutral 1ps Answer:-

  19. John added an alkali (potassium hydroxide) to an acid (sulphuric acid) and measured the pH using a pH meter. This was repeated until he achieved a neutral solution. Suggest a pH of the acid solution at the beginning. _______________________________________________________ When John achieved a neutral solution, what would the pH be? _______________________________________________________ Name the salt formed in this reaction. _______________________________________________________ Suggest an alternative way to measure the pH, rather than using a pH meter. Unit 1 Revision: Acids and Bases Answer:-

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