Exothermic & Endothermic Reactions (CIE IGCSE Chemistry: Co-ordinated Sciences (Double Award))

Topic Questions

3 hours29 questions
11 mark

Extended tier only

The graph below shows a reaction profile for the reaction between methane and oxygen. 

 ~Bui1Oy6_1

What does the label X represent?

  • Activation energy

  • Overall energy change

  • Reactants

  • Progress of the reaction

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21 mark

What is the reading on the following thermometer?

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  • 28.3 oC

  • 28.6 oC

  • 29.2 oC

  • 28.5 oC

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31 mark

A student adds a small amount of ammonium chloride to a beaker of water. The temperature of the water decreases from 21 oC to 17 oC.

Which type of reaction has occurred and why?

  type of reaction reason
A exothermic heat is released
B exothermic heat is absorbed
C endothermic heat is released
D endothermic heat is absorbed

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    41 mark

    The energy level diagram below shows the relative energies of the reactants and products in a reaction.

    q4-5-1-easy-cie-igcse-chemistry

    Which row correctly describes the type of reaction and corresponding energy change?

      type of reaction energy change
    A endothermic heat is released
    B endothermic heat is absorbed
    C exothermic heat is released
    D exothermic heat is absorbed

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      51 mark

      Calcium and hydrochloric acid react to produce calcium chloride and hydrogen gas. The energy level diagram for the reaction is shown below.

      q5-5-1-easy-cie-igcse-chemistry

      Which statement about this reaction is not correct?

      • The temperature of the surroundings increases.

      • The reaction is endothermic.

      • The products have less energy than the reactants.

      • Energy is released during the reaction.

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      11 mark

      Which of the following processes is endothermic?

      • Reacting sodium with water.

      • The use of petrol in an engine.

      • Distilling crude oil.

      • Burning fossil fuels.

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      21 mark

      Extended tier only

      In all chemical reactions, bonds in the reactant species are broken and new bonds are formed in the products. Which statement is correct?

      • Bond breaking requires energy and is thus an exothermic process.

      • Bond breaking requires energy and is thus an endothermic process.

      • Bond breaking releases energy and is thus an exothermic process.

      • Bond breaking releases energy and is thus an endothermic process.

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      31 mark

      Which is true about chemical energy changes?

         Reaction type Energy flows Temperature of surroundings
      A exothermic to the surroundings increases
      B exothermic from the surroundings decreases
      C endothermic to the surroundings decreases
      D endothermic from the surroundings increases

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        4
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        1 mark

        Extended tier only

        The reaction profile for making nitrogen monoxide, NO, is shown below:

         u~9ImaV8_2

        What is the activation energy for this reaction?

        • +140 kJ

        • +180 kJ

        • +320 kJ

        • -330 kJ

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        51 mark

        Endothermic reactions can be used in emergency sports injury treatment packs.

        What is true about these packs?

        • Absorb energy from the surroundings and transfer it to the injury

        • Can be re-used

        • Usually contain ammonium nitrate and water in separate compartments

        • Cause the temperature of the surroundings to increase

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        11 mark

        Extended tier only

        An energy level diagram is shown below.

        q5-5-1-hard-cie-igcse-chemistry

        Which row is correct for the points labelled 1, 2 and 3?

          1 2 3
        A activation energy energy change reactants
        B energy change activation energy products
        C energy change activation energy reactants
        D activation energy energy change products

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