Rate Of Reaction
A quiz to assess your understanding of the whole topic.
- 1.When solid sodium thiosulfate reacts with dilute HCl, sulfur and sulfur dioxide gas are produced. Which of the following cannot alter the rate of this reaction?
- A.
The particle size of sodium thiosulfate
- B.
The concentration of hydrochloric acid
- C.
The pressure applied to the reaction mixture
- D.
The temperature of the reaction mixture
- 2.Which of the following acids will produce the fastest initial speed of reaction when 1.0 g of calcium carbonate is added to it? (Assume that the experiments are carried out at the same temperature)
- A.
50.0 cm3 of 1.0 mol/dm3 nitric acid
- B.
50.0 cm3 of 1.0 mol/dm3 sulfuric acid
- C.
50.0 cm3 of 1.0 mol/dm3 hydrochloric acid
- D.
100.0 cm3 of 1.0 mol/dm3 ethanoic acid
- 3.Which of the following statements is true of catalyst?
- A.
A catalyst must be a compound.
- B.
A catalyst increases the yield of a product in a chemical reaction.
- C.
The mass of a catalyst before and after a chemical reaction is the same.
- D.
A catalyst increases the speed of a reaction by lowering the enthalpy change of a chemical reaction.
- 4.A catalyst increases the rate of a reaction by lowering the ______________ energy of a reaction.
- 5.Copper (II) oxide is a black solid. It catalyses the decomposition of hydrogen peroxide. Some hydrogen peroxide was shaken with copper (II) oxide in a test tube. When the reaction had stopped, the test tube contained
- A.
A blue solution only
- B.
A black solid and a blue solution
- C.
A black solid and a colourless solution
- D.
A brown solid and a colourless solution
- 6.Which of the following solutions would give the greatest initial rate of reaction and largest volume of gas when reacted with 1.0 g of calcium carbonate?
- A.
50.0 cm3 of 2.0 mol/dm3 sulfuric acid
- B.
50.0 cm3 of 2.0 mol/dm3 HCl
- C.
100 cm3 of 1.5 mol/dm3 HCl
- D.
25.0 cm3 of 2.5 mol/dm3 HCl
- 7.When an excess of calcium carbonate is added to dilute HCl, the reaction gradually becomes slower and finally stops. Which statement best explains why this happens?
- A.
An insoluble layer of calicum chloride is formed on the calcium carbonate.
- B.
The concentration of HCl gradually reduces to zero.
- C.
The pieces of calcium carbonate gradually become smaller.
- D.
The calcium carbonate is covered by bubbles of carbon dioxide.
- 8.When a piece of calcium metal is added to dilute hydrochloric acid, the reaction is seen to be faster after 60 seconds than after only 10 seconds. What could explain this observation ?
- A.
The piece of calcium is smaller at 60 seconds than at 10 seconds.
- B.
The concentration of the hydrochloric acid increases during the reaction.
- C.
The reaction is catalysed by hydrogen ions from the acid.
- D.
Heat is produced in the reaction, which raises the temperature and so increases the rate.
- 9.
Aqueous hydrogen peroxide decomposes to give oxygen gas. Two experiments were carried out to measure the rate of production of oxygen gas from aqueous hydrogen peroxide. The following graph was obtained.Which of the following sets of solutions have been used?- A.
Experiment I: 75 cm3 of 1.0 mol/dm3 hydrogen peroxide; Experiment II: 50 cm3 of 1.0 mol/dm3 hydrogen peroxide
- B.
Experiment I: 75 cm3 of 0.5 mol/dm3 hydrogen peroxide Experiment II: 25 cm3 of 1.0 mol/dm3 hydrogen peroxide
- C.
Experiment I: 25 cm3 of 1.0 mol/dm3 hydrogen peroxide Experiment II: 75 cm3 of 0.5 mol/dm3 hydrogen peroxide
- D.
Experiment I: 100 cm3 of 1.0 mol/dm3 hydrogen peroxide Experiment II: 50 cm3 of 1.0 mol/dm3 hydrogen peroxide
- 10.One way to monitor the rate of a reaction is to measure the loss of mass of the reactants over a period of time. Which of the following reaction's rate cannot be monitored using this method?
- A.
Decomposition of aqueous hydrogen peroxide
- B.
Reaction of Mg with dilute HCl
- C.
Reaction of copper (II) sulfate with aqueous sodium hydroxide
- D.
Reaction of copper (II) carbonate wtih dilute HCl
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