10a Rate of Reaction I

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Question 1 of 12

1. Question
1 point(s)
Which of the following is true about the rate of a reaction?
- I. The rate of a reaction is a measure of how fast the reaction occurs.
- II. The rate of a reaction is high if the reaction happen very fast.
- III. The rate of a reaction is always constant over time until the reaction complete.
- IV. The rate of reaction can be determined by measuring the amount of reactant/product changes in 1 unit of time.
Correct

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Question 2 of 12

2. Question
1 point(s)
Which of the followings is not the unit of the rate of a reaction?
- sˉ¹
- mol dm⁻³
- g sˉ¹
- cm³ sˉ¹
- mol sˉ¹
Correct

Incorrect
Question 3 of 12

3. Question
1 point(s)
The following chemical equation shows the reaction of calcium carbonate with sulphuric acid.

CaCO₃(s) + H₂SO₄(aq) → CaSO₄(aq) + CO₂(g) + H₂O(l)

Which of the followings are suitable to be used to find the average rate of the reaction.
- I. Measure the volume of carbon dioxide released over the time taken
- II. Measure the volume of the CaSO₄ formed over the time taken
- III. Measure the decrease of the mass of the mixture over the time taken
- IV. Measure the decrease of the mass of CaCO₃ over the time taken
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Question 4 of 12

4. Question
1 point(s)
Which of the following methods can be used to find the rate of a reaction?
- I. Formation of precipitate in one unit of time
- II. Volume of gas released in one unit of time
- III. Increase of the mass of the reactants in one unit of time
- IV. Change of colour in one unit of time
Correct

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Question 5 of 12

5. Question
1 point(s)
The diagram above shows the set-up of the apparatus used to investigate the decomposition rate of hydrogen peroxide. Which of the following is the graph obtained when the reading of the compression balance is plotted against time?
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Question 6 of 12

6. Question
1 point(s)
The figure shows the graph of the volume of hydrogen gas released against time for the reaction between granulated zinc and hydrochloric acid. The amount of zinc used is in excess. Graph M is obtained when 25 cm³ hydrochloric acid of concentration 1 mol/dm³. is used. Which of the following must be done to produce curve N?
- Cool the hydrochloric acid.
- Replace granulated zinc with zinc powder.
- Add more hydrochloric acid to the solution.
- Use sulphuric acid of same concentration instead of hydrochloric acid.
Correct

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Question 7 of 12

7. Question
1 point(s)
The graph below shows the volume of oxygen gas released over time in a chemical reaction. Why the volume of the oxygen remains unchanged after 5 minutes?
- The pressure of oxygen gas become too low after 5 minute.
- The oxygen released has dissolved in water.
- The rate of reaction become very low after 5 minute.
- One of the reactants of this reaction has finish.
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Question 8 of 12

8. Question
1 point(s)
The graph shows the volume of carbon dioxide produced against time in a chemical reaction. Find the rate of reaction at 3 minutes.
- 8.25 cm³/min
- 3.50 cm³/min
- 4.85cm³/min
- 12.05 cm³/min
Correct

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Question 9 of 12

9. Question
1 point(s)
CHEM1003010

The graph shows the volume of gas released in a reaction against time. Which of the following statement is not true about the reaction?
- The rate of reaction at t₂ is higher than at t₃.
- The reaction completely stop at t₄.
- The rate of reaction increases over time.
- The volume of the gas collected in the end of the reaction is V₄.
Correct

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Question 10 of 12

10. Question
1 point(s)
13.0g of zinc reacts completely with excess hydrochloric acid in 5 minutes. Find the average of the reaction. [ Relative atomic mass of Zinc = 65]
- 0.04 mol/min
- 2.60 mol/min
- 0.84 mol/min
- 1.25 mol/min
Correct

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Question 11 of 12

11. Question
1 point(s)
2HCl(aq) + Na₂S₂O₃(aq) → 2NaCl(aq) + S(s) + SO₂(g) + H₂O(l)
The equation above represents the reaction between dilute hydrochloric acid and sodium thiosulphate. Given that sulphur precipitate was produced after 40 seconds. What is the rate of the reaction?
- 0.025 sˉ¹
- 0.05 sˉ¹
- 0.075 sˉ¹
- 0.10 sˉ¹
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Question 12 of 12

12. Question
1 point(s)
The graph shows the volume of carbon dioxide produced against time in a chemical reaction. Find the rate of reaction for the first 4 minutes.
- 7.0 cm³/min
- 3.0 cm³/min
- 3.6 cm³/min
- 6.0 cm³/min
Correct

Incorrect