Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Rates of Reaction
164 practice questions
Topics covered
- Experiments to measure the rate of reaction19 practice questions
- Explaining what's happening19 practice questions
- Changing the surface area of the reactants19 practice questions
- Changing the concentration of the reactants19 practice questions
- Changing the pressure on the reaction19 practice questions
- What are catalysts?19 practice questions
- How does a catalyst work?20 practice questions
- Catalysts in industry19 practice questions
Practice questions
71–80 of 164
Question 71
1 mark · Normal
Answer and check →Which of the following is the concentration (in mol/dm³) of a solution made by mixing 6.0 cm³ of 2.00 mol/dm³ hydrochloric acid with 19.0 cm³ of distilled water to make a total of 25.0 cm³?
- A.0.30 mol/dm³
- B.0.40 mol/dm³
- C.0.48 mol/dm³
- D.0.60 mol/dm³
Question 72
2 marks · Normal
Answer and see the solution →A reaction between powdered magnesium and dilute hydrochloric acid releases 0.30 g of hydrogen in the first 20 seconds. Calculate the average rate of production of hydrogen gas in g/s.
Question 73
4 marks · Normal
Answer and see the solution →Look at the following graph, which shows the rate of reaction (y-axis, in g/s) against concentration of hydrochloric acid (x-axis, in mol/dm³) for a certain reaction.
Rate of reaction vs concentration of HCl (a)[1 mark]Describe the shape and position of the line on the graph.
(b)[1 mark]What does this show about the relationship between the concentration of hydrochloric acid and the rate of reaction?
(c)[2 marks]If the concentration is doubled, what happens to the rate of reaction? Explain your answer.
Question 74
2 marks · Hard
Answer and see the solution →A student investigates the reaction between calcium carbonate and hydrochloric acid. State, with a reason, what happens to the rate of reaction if the concentration of hydrochloric acid is reduced to a third, assuming all other conditions remain the same.
Question 75
5 marks · Hard
Answer and see the solution →A student prepares dilute hydrochloric acid for a reaction by adding water to a known volume of 2.50 mol/dm³ hydrochloric acid. She then uses the solution to react with marble chips.
(a)[2 marks]She mixes 10.0 cm³ of 2.50 mol/dm³ acid with 30.0 cm³ of water to make 40.0 cm³ of solution. Calculate the concentration, in mol/dm³, of the hydrochloric acid after dilution.
(b)[2 marks]She repeats the process, using 25.0 cm³ of 2.50 mol/dm³ acid topped up with water to 40.0 cm³. Calculate the new concentration, in mol/dm³, after dilution.
(c)[1 mark]State the formula used to calculate the final concentration when diluting a solution.
Question 76
2 marks · Hard
Answer and see the solution →An experiment produced 0.46 g of carbon dioxide in the first 20 seconds during the reaction of marble chips with dilute hydrochloric acid. Calculate the average rate of carbon dioxide production, giving your answer in g/s. Show your working.
Question 77
1 mark · Easy
Answer and see the solution →State what happens to the rate of a reaction between two gases when the pressure is increased.
Question 78
3 marks · Easy
Answer and see the solution →A student wants to increase the rate of a reaction involving only liquids. She decides to increase the pressure.
(a)[2 marks]Explain why this change in pressure will have little effect on the rate of reaction.
(b)[1 mark]Describe how the particles in a liquid are arranged.
Question 79
2 marks · Easy
Answer and see the solution →A reaction between two gases at a certain pressure takes 16 minutes. When the pressure is doubled, the rate of reaction doubles. Calculate the new time taken for the reaction to complete at the higher pressure.
Question 80
2 marks · Easy
Answer and see the solution →Explain why increasing the pressure does not significantly affect the rate of reaction for a reaction involving only solids.