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Exothermic endothermic test with answers for grade 8 science (free PDF download)

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Quick answer: An exothermic reaction releases energy to its surroundings, so the temperature rises, as in a hand warmer or a burning candle. This grade 8 science test on exothermic endothermic has 8 questions worth 20 marks, to do in 45 minutes: definitions, classify and temperature change. The mark scheme is on a separate page; free printable PDF.

Exothermic endothermic test with answers for grade 8 science (free PDF download)

Also, this test lasts 45 minutes and is worth 20 marks. use c = 4.2 J/(g °C) for water. Then, show the formula and substitution in calculations, give units, and write complete sentences in the explanations.

Level: Grade 8 science (Year 9 · Class 8) · Curriculum: MS-PS1-6

Time: 45 minutes · 8 questions · Total: 20 marks · Calculator allowed

Question 1 Definitions (2 marks)

  1. Define an endothermic reaction. (1 mark)
  2. In addition, give one everyday example. (1 mark)

Question 2 Classify (2 marks)

  1. In addition, state whether burning methane in a Bunsen burner is exothermic or endothermic. (1 mark)
  2. Afterwards, state whether dissolving ammonium nitrate in water is exothermic or endothermic. (1 mark)

Question 3 Temperature change (3 marks)

A mixture goes from 18.5 °C to 27.0 °C.

  1. Calculate ΔT. (1 mark)
  2. Moreover, state the type of reaction and give a reason. (2 marks)

Question 4 Energy calculation (3 marks)

Use c = 4.2 J/(g °C). A reaction warms 80 g of water by 7.5 °C.

  1. Also, calculate the energy gained by the water. (2 marks)
  2. Then, the same energy warms 160 g of water. Then, calculate the temperature rise. (1 mark)

Question 5 Cold pack graph (3 marks)

The graph shows the temperature of an instant cold pack.

Graph of temperature against time for an instant cold pack: 22 degrees Celsius at the start, a minimum of 5 degrees at 3 minutes, then a slow rise to 19 degrees at 20 minutes0510152004812162024Time (min)Temperature (°C)
Temperature of an instant cold pack.
  1. In addition, state the lowest temperature reached. (1 mark)
  2. Moreover, calculate the fall from the start. (1 mark)
  3. Explain why the temperature rises later. (1 mark)

Question 6 How a hand warmer works (3 marks)

  1. Explain why a hand warmer gets warm and later stops. (3 marks)

Question 7 Energy diagram (2 marks)

Afterwards, the diagram shows energy levels for a reaction.

Energy diagram: reactants at a higher level of 150 kilojoules and products at a lower level of 110 kilojoulesEnergyReactantsProductsEnergy levels: reactants 150 kJ, products 110 kJ
Energy levels for a reaction.
  1. State whether the reaction is exothermic or endothermic. (1 mark)
  2. Moreover, calculate the energy transferred in kJ. (1 mark)

Question 8 Correct the idea (2 marks)

  1. A player says ‘a cold pack puts cold into my knee’. Explain what really happens. (2 marks)

See the exothermic endothermic test answers and mark scheme

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