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Exothermic and endothermic reactions

8th grade (Year 9 in England) · 16 questions · Common Core: NGSS.MS-PS1-6, NGSS.HS-PS1-4 · England: KS3 Chemistry: Energetics, KS4 Combined Science: Energy changes in chemistry

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Date

Score/ 16

  1. Question 1

    The temperature of a reaction mixture changes from 20 °C to 29 °C. What is the temperature change? (Use a minus sign for a fall.)

    Answer°C

  2. Question 2

    Is this exothermic or endothermic: citric acid reacting with sodium hydrogencarbonate (sherbet)?

    • A. exothermic
    • B. endothermic

  3. Question 3

    In an exothermic reaction, the energy of the products is…

    • A. exactly the same as the reactants
    • B. zero
    • C. higher than the energy of the reactants
    • D. lower than the energy of the reactants

  4. Question 4

    The temperature of a reaction mixture changes from 21 °C to 6 °C. What is the temperature change? (Use a minus sign for a fall.)

    Answer°C

  5. Question 5

    Is this exothermic or endothermic: a self-heating hand warmer?

    • A. exothermic
    • B. endothermic

  6. Question 6

    Breaking chemical bonds…

    • A. gives out energy (exothermic)
    • B. takes in energy (endothermic)
    • C. has no energy change
    • D. creates new atoms

  7. Question 7

    The temperature of a reaction mixture changes from 19 °C to 32 °C. What is the temperature change? (Use a minus sign for a fall.)

    Answer°C

  8. Question 8

    Is this exothermic or endothermic: magnesium reacting with acid?

    • A. exothermic
    • B. endothermic

  9. Question 9

    A self-heating can of coffee uses which kind of reaction?

    • A. exothermic
    • B. nuclear
    • C. photosynthesis
    • D. endothermic

  10. Question 10

    The temperature of a reaction mixture changes from 20 °C to 5 °C. What is the temperature change? (Use a minus sign for a fall.)

    Answer°C

  11. Question 11

    Is this exothermic or endothermic: citric acid reacting with sodium hydrogencarbonate (sherbet)?

    • A. exothermic
    • B. endothermic

  12. Question 12

    What is activation energy?

    • A. the energy in a battery
    • B. the minimum energy particles need to react when they collide
    • C. the energy of light
    • D. the energy given out by a reaction

  13. Question 13

    The temperature of a reaction mixture changes from 18 °C to 8 °C. What is the temperature change? (Use a minus sign for a fall.)

    Answer°C

  14. Question 14

    Is this exothermic or endothermic: a self-heating hand warmer?

    • A. exothermic
    • B. endothermic

  15. Question 15

    What is activation energy?

    • A. the energy in a battery
    • B. the energy of light
    • C. the energy given out by a reaction
    • D. the minimum energy particles need to react when they collide

  16. Question 16

    The temperature of a reaction mixture changes from 21 °C to 16 °C. What is the temperature change? (Use a minus sign for a fall.)

    Answer°C

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  1. 9 °C
  2. endothermic
  3. lower than the energy of the reactants
  4. -15 °C
  5. exothermic
  6. takes in energy (endothermic)
  7. 13 °C
  8. exothermic
  9. exothermic
  10. -15 °C
  11. endothermic
  12. the minimum energy particles need to react when they collide
  13. -10 °C
  14. exothermic
  15. the minimum energy particles need to react when they collide
  16. -5 °C