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8.2 Heat energy changes in chemical reactions

8.2 Heat energy changes in chemical reactions

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Question 35

An outdoor adventurer tests a portable hand-warming pack containing anhydrous calcium chloride and water. They record the following data during the activation:

  • Initial temperature of the water = 5.5 ∘C5.5\text{ }^{\circ}\text{C}5.5 ∘C
  • Maximum temperature reached after mixing = 48.2 ∘C48.2\text{ }^{\circ}\text{C}48.2 ∘C

Explain, using these temperature measurements, the type of energy change that occurs when anhydrous calcium chloride dissolves in water.

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8.2 Heat energy changes in chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /8.2 Heat energy changes in chemical reactions

94 exam-style questions on Edexcel GCSE Chemistry 8.2 Heat energy changes in chemical reactions, covering 8.2.1 Exothermic and endothermic changes, 8.2.2 Bond breaking, bond making and overall energy change, 8.2.3 Calculating energy change from bond energies, and 8.2.4 Activation energy and reaction profiles. Each one has a worked solution and a mark scheme showing where the marks go.

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