IGCSEChemistryCambridge (CIE)Exam Questions6. Chemical ReactionsChemical Change & Rate of Reaction

Chemical Change & Rate of Reaction (Cambridge (CIE) IGCSE Chemistry)

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Chemical Change & Rate of Reaction

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Chemical Change & Rate of Reaction

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1
Sme Calculator1 mark

The rate of a reaction was monitored by recording the volume of gas produced every 5 seconds.

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What is the mean rate of reaction in the first 10 seconds of the reaction, in cm3/s?

  • 2.9

  • 3.0

  • 3.5

  • 2.5

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21 mark

Which of the following processes represents a physical change?

  • Acid base neutralisation

  • Metal displacement reactions

  • Boiling ethanol

  • Combustion of magnesium

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31 mark

Physical and chemical changes are different processes. Which of the following rows correctly identifies characteristics of each one?

  • chemical change - no new substance formed
    physical change - change of state

  • chemical change - no new substance formed
    physical change - involves electron transfer

  • chemical change - new substance formed
    physical change - involves electron transfer

  • chemical change - new substance formed
    physical change - change of state

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41 mark

A student was measuring the rate of reaction using the apparatus in the diagram.

ms3-6-1-easy-cie-igcse-chemistry

What reaction is the student studying?

  • CaO + H2SO4 → CaSO4 + H2O

  • Mg(OH)2 + 2HCl → MgCl2 + 2H2O

  • Fe + H2SO4 → FeSO4 + H2

  • KCl + AgNO3 → KNO3 + AgCl

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51 mark

A student was investigating the rate of reaction between iron and a solution of sulfuric acid. Two experiments were performed, P and Q, in which the volume of hydrogen was recorded at regular intervals.

q5-6-1-easy-cie-igcse-chemistry

Which change could explain the difference in results between P and Q?

  • The student added a catalyst in P.

  • Larger pieces of iron were used in P.

  • Less concentrated acid was used in P.

  • Larger quantities of both reactants are used P.

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11 mark

A student was investigating the rate of reaction between a solid base and a solution of sulfuric acid. Two experiments were performed, S and T, in which the mass of the reaction flask was recorded as shown in the graph.

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Which of the following changes could explain the difference in results between S and T?

  • The sulfuric acid is less concentrated in T.

  • The sulfuric acid is more concentrated in T.

  • A higher temperature is used in S.

  • Larger sized particles are used in T.

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21 mark

Which graph correctly shows the effect of increasing the temperature on the rate of reaction between magnesium and sulfuric acid in which neither reactant runs out?

q2-6-1-medium-cie-igcse-chemistry

  • Option A

  • Option B

  • Option C

  • Option D

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31 mark

A student reacts a metal carbonate with nitric acid and measures the volume of carbon dioxide gas released at regular intervals. The results of the experiment are shown in the graph.

q3-6-1-medium-cie-igcse-chemistry

Between which two measurements was the reaction the fastest?

  • 0 and 2 minutes

  • 2 and 4 minutes

  • 4 and 6 minutes

  • 10 and 12 minutes

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41 mark

Magnesium metal reacts with an excess of hydrochloric acid solution to form magnesium chloride and hydrogen:

Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)

Which of the following will not increase the rate of this reaction?

  • Increase the temperature of the acid

  • Increase the surface area to volume ratio of the pieces of magnesium

  • Increase the concentration of the hydrochloric acid

  • Increase the volume of hydrochloric acid solution used

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51 mark

Catalysts are often used in chemical reactions.

Which letter represents two correct features of catalysts?

  • Feature 1 - Lower activation energy for the reaction
    Feature 2 - More products made in total

  • Feature 1 - Alternative pathway for the reaction is provided
    Feature 2 - Not used up over the course of the reaction

  • Feature 1 - Makes industrial processes cheaper
    Feature 2 - Metal catalysts are cheap to buy

  • Feature 1 - Reduce the overall energy change of the reaction
    Feature 2 - Can be present in biological systems as enzymes

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11 mark

A student was investigating the rate of reaction between acid and metals. The experimental set-up is shown below.

q1-6-1-hard-cie-igcse-chemistry

Which test tube would give the quickest reaction?

  • Option A

  • Option B

  • Option C

  • Option D

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21 mark

The graph shows the results of two separate reaction rate investigations using excess calcium carbonate and sulfuric acid.

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Which statement explains the difference between the results?

  • The temperature was higher in experiment 2.

  • Experiment 2 was allowed more time to react.

  • Same volume of a more concentrated acid was used in experiment 2.

  • More calcium carbonate was used in experiment 2.

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31 mark

Which of the following statements explains how increasing temperature increases the rate of a reaction?

  • Increasing the temperature increases the kinetic energy of the particles so there are a smaller number of successful collisions.

  • Increasing the temperature increases the kinetic energy of the particles so there are a larger number of unsuccessful collisions.

  • Increasing the temperature decreases the kinetic energy of the particles so there are a larger number of successful collisions.

  • Increasing the temperature increases the kinetic energy of the particles so there are a larger number of successful collisions.

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41 mark

Which of the following statements best describes the activation energy of a reaction?

  • The minimum energy released when colliding particles react.

  • The minimum energy required for particles to react when they collide.

  • The maximum energy required for particles to react when they collide.

  • The maximum energy released when colliding particles react.

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51 mark

Which of the following statements correctly describes the effects of increasing concentration on the rate of a reaction?

  • Increasing the concentration increases the rate of reaction as there are more successful collisions between particles per unit time.

  • Increasing the concentration increases the rate of reaction as there is more space between particles.

  • Increasing the concentration increases the rate of reaction as there are more collisions between particles per unit time.

  • Increasing the concentration increases the rate of reaction as there are more collisions between particles at the beginning of the reaction.

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