10b Rate of Reaction II

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Question 1 of 6

1. Question
1 point(s)
The equation below shows a reaction to produce hydrogen gas.

3H₂SO₄ + 2Al → Al₂(SO₄)₃ + 3H₂

Which of the following will increase the rate of the reaction?
- 1. I. Increase the temperature of the mixture
- 2. II. Increase the concentration of the sulphuric acid
- 3. III. Use aluminium powder instead of granular aluminium.
- 4. IV. Increase of the volume of the sulphuric acid
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Question 2 of 6

2. Question
1 point(s)
The figure shows the energy profile diagram for the decomposition reaction of Potassium chlorate(V). Which of the following is true about curve P and Q?
- 1. Curve P represent the reaction occurs at a higher temperature.
- 2. Curve Q is produced when higher pressure is exerted on Potassium chlorate(V).
- 3. With the present of curve Q, decomposition of potassium chlorate(V) become faster.
- 4. With the present of curve Q, more oxygen is produced at the end of the reaction.
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Question 3 of 6

3. Question
1 point(s)
2H₂O₂ → 2H₂O + O₂

The equation above show the decomposition of hydrogen peroxide. The rate of this reaction decreases over time because
- 1. the product of the reaction increases over time
- 2. the temperature of hydrogen peroxide decreases over time
- 3. the concentration of hydrogen peroxide decreases over time
- 4. the volume of hydrogen peroxide decreases over time
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Question 4 of 6

4. Question
1 point(s)
2 experiments are carried out to study the rate of reaction between calcium carbonate and nitric acid to produce carbon dioxide gas. The quantity of reactant used are as follow:

Experiment 1: Excess calcium carbonate and 25 cm³ of 1 mol/dm³ nitric acid
Experiment 2: Excess calcium carbonate and 50 cm³ of 0.5 mol/dm³ nitric acid

Which of the following graphs represents the 2 experiments
- 1.
- 2.
- 3.
- 4.
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Question 5 of 6

5. Question
1 point(s)
Hydrogen peroxide solution is decomposed by using manganese (IV) oxide as catalyst. Three experiments were carried out using a fixed amount of manganese (IV) oxide. The results are shown in the graph. The solutions used were :

(a) 25 cm³ of 2.0 mol/dm³ hydrogen peroxide;
(b) 50 cm³ of 1.0 mol/dm³ hydrogen peroxide;
(c) 50 cm³ of 2.0 mol/dm³ hydrogen peroxide;

Which curve did each solution pro-duce?
- 1. (a) P
  (b) R
  (c) Q
- 2. (a) P
  (b) Q
  (c) R
- 3. (a) Q
  (b) R
  (c) P
- 4. (a) R
  (b) P
  (c) Q
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Question 6 of 6

6. Question
1 point(s)
Which of the following are the characteristics of a catalyst?
- 1. I. It can change the rate of reaction.
- 2. II. It does not change the amount of the product at the end of the reaction.
- 3. III. Its chemical properties may change at the end of the reaction.
- 4. IV. It may undergoes physical change after a reaction.
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