National 5 (Scotland) · National 5 Chemistry

Rates, Acids and Nature's Chemistry

15 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 15 questions

  1. 24 cm³ of gas is collected in 30 seconds during a reaction. What is the average rate?
  2. On a graph of volume of gas against time, one reaction line is steeper than another. What does this show?
  3. Why does raising the temperature increase the rate of a reaction?
  4. What does a catalyst do?
  5. Why does powdered calcium carbonate react faster with acid than the same mass of marble chips?
  6. In a reaction 12 cm³ of gas has formed after 20 s and 30 cm³ after 60 s. What is the average rate between 20 s and 60 s?
  7. What happens to the pH of a hydrochloric acid solution when it is diluted with water?
  8. Which substances are always produced in a neutralisation reaction between an acid and an alkali?
  9. Which salt is made when sulfuric acid reacts with sodium hydroxide?
  10. Copper(II) oxide reacts with dilute nitric acid. Which salt is formed?
  11. Solutions of hydrochloric acid and ethanoic acid have the same concentration. The hydrochloric acid has the lower pH. Why?
  12. What colour does litmus solution turn in an alkali?
  13. What is the molecular formula of an alkane with five carbon atoms?
  14. Bromine water is shaken with a hydrocarbon and changes from orange to colourless. What does this show?
  15. What is the name of the alkene with four carbon atoms?

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