10c Rate of Reaction III

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Question 1 of 10

1. Question
1 point(s)
A solid reactant with smaller size can react faster because
- its particles have higher kinetic energy.
- it has lower activation energy.
- it provide bigger surface for the collision with the particles of another reactant.
- it can dissolve faster in the solution.
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Question 2 of 10

2. Question
1 point(s)
Food can be kept longer in the refrigerator. This is because the
- lack of oxygen in the refrigerator slows down the decomposition of food by bacteria
- lower temperature in the refrigerator slows down the decay of food
- rate of bacterial reproduction is lowered in the dark condition inside the refrigerator
- process of food decay releases heat, which is subsequently absorbed by the refrigerator
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Question 3 of 10

3. Question
1 point(s)
In an experiment, a student found that the higher the temperature of the reactant, the higher the rate of the reaction. Which of the following statement can explain the finding of the student?
- The number of effective collisions between the particles of the reactants is higher at higher temperature.
- The frequency of effective collisions between the particles of the reactants is higher at higher temperature.
- The activation energy of the reaction is lower at higher temperature.
- The chemical bonds of the reactants can be broken easily at high temperature.
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Question 4 of 10

4. Question
1 point(s)
The figure shows the energy profile diagram of the reaction between X and Y to form substance Z. What is the activation energy of the reaction?
- 500 kJ/mol
- 1000 kJ/mol
- 1500 kJ/mol
- 2000 kJ/mol
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Question 5 of 10

5. Question
1 point(s)
2Fe²⁺ + Br₂ → 2Fe³⁺ + 2Br^–

The equation above shows the reaction between iron(II) ion and liquid bromine to produce iron(III) ion and bromide ions. It was found that the change of colour from green to brown become faster if the temperature of the solution is increased. This was owing to
- I. The activation energy of the reaction become lower
- II. The frequency of collision between iron(II) ion and bromine molecule become higher
- III. The kinetic energy of the iron(II) ions and bromine molecules has increased.
- IV. The frequency of effective collision between iron(II) ions and bromine molecules has increase
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Question 6 of 10

6. Question
1 point(s)
The higher the concentration of the reactants, the higher the rate of reaction.

Which of the following give the best explanation about the statement above?
- The higher the concentration, the lower the activation energy of the reaction. Therefore, the higher the frequency of the effective collisions.
- The higher the concentration, the higher the number of particles per unit volume and hence the higher the frequency of the collisions between the particles.
- The higher the concentration, the higher the average kinetic energy of the particles of the reactants and hence the higher the frequency of the effective collisions.
- The higher the concentration, the easier the reaction take place. Therefore, the higher the number of effective collisions.
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Question 7 of 10

7. Question
1 point(s)
Which of the following are correct about a catalyst in a reaction.
- I. A catalyst can increase/reduce the rate of a reaction.
- II. Catalyst provides an alternative path with different activation energy for the reaction to occur.
- III. Presence of catalyst may change the frequency of effective collision of the reaction.
- IV. Catalyst does not take part in the reaction.
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Question 8 of 10

8. Question
1 point(s)
Which of the following pairs is correct about the use of catalysts in a chemical processes?
- Catalyst: Aluminium oxide
  Process: Production of sulphuric acid in the Contact process
- Catalyst: Iron
  Process: Production of ammonia in the Haber process
- Catalyst: Nickel
  Process: Production of nitric acid in the Ostwald process
- Catalyst: Vanadium(V) oxide
  Process: Production of margarine via hydrogenation
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Question 9 of 10

9. Question
1 point(s)
Which of the following statements about the contact process are correct?
- I. Vanadium(V) oxide is used to increase the yield of sulphur trioxide
- II. The process is carried out at 500 °C and 1 atm.
- III. The rate of reaction between sulphur dioxide and oxygen is increased at a higher temperature
- IV. The production of sulphur trioxide becomes faster at low pressure
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Question 10 of 10

10. Question
1 point(s)
CHEM1005010
Which of the following statements are correct about effective collision?
- I. It is the collision that absorbs energy from the surrounding.
- II. It is the collision that release energy to the surrounding.
- III. It is the collision that causes reaction to happen.
- IV. The higher the frequency of effective collision, the higher the rate of reaction.
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