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Heat energy changes in chemical reactions

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Question 34

An instant heating pad contains a solid chemical and a small inner pouch of water.

A diagram of an instant heating pad. The outer rectangular pack is labelled 'INSTANT HEAT PACK' and 'DISPOSABLE - SINGLE USE'. Inside, there is a solid powder layer, and a smaller, fragile sealed inner pouch containing water is embedded in the middle.

When the inner pouch is squeezed and broken, the water mixes with the solid chemical in an exothermic reaction.

Give the reason why this heating pad can only be used once.

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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