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Heat energy changes in chemical reactions

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Question 72

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.

[2]

Heat energy changes in chemical reactions Questions

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

Practise Edexcel GCSE Chemistry Heat energy changes in chemical reactions with exam-style questions for Foundation and Higher tier. 130 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank