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Heat energy changes in chemical reactions

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Question 13

A scientist investigates the temperature change when anhydrous calcium chloride dissolves in water.

They use the following method:

  1. Pour 75 cm3 of distilled water into a vacuum-insulated flask.
  2. Add 8.5 g of anhydrous calcium chloride and quickly seal the flask with a stopper containing a temperature probe.
  3. Record the maximum temperature reached.

Calorimeter setup

The scientist cannot work out the temperature increase using this method.

State what the scientist must do before Step 2 to be able to work out the temperature increase.

[1]

Heat energy changes in chemical reactions Questions

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

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