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BRRRR, IT'S COLD!

Mix lemon juice and baking soda to make an endothermic reaction

Suitable For

Grade 2

Difficulty

2

Time Required

 <12 Hours

Supervision

Advised

What’s it about?

A ‘chemical reaction’ is simply the breaking apart of substances to form new substances. Energy is required to break down substances, and it is most often released when new substances are formed. Some chemical reactions called an ‘endothermic reaction’, also absorb energy or ‘heat’ in order to proceed, and the temperature of the reaction drops, as can be seen in the following science experiment:

Topics covered

Chemical reaction, Exothermic reaction, Endothermic reaction

What will I need?

  • PLASTIC CUP
  • LEMON JUICE
  • BAKING SODA
  • SPOON
  • SMALL THERMOMETER
  • STOP WATCH

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

This science experiment is an example of an endothermic reaction, a type of chemical reaction that absorbs heat, a type of energy, from its surroundings. The ‘baking soda’ requires energy to dissolve and they take the heat or ‘energy’ out of the lemon juice. The juice loses heat in the process and its temperature decreases.

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