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More Science Lessons (KS3/Checkpoint 1)
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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Energy is needed for life processes such as growth and repair, movement and control of body temperature in mammals.
Respiration is a chemical reaction that happens in all living cells, including plant cells and animal cells. It is the way that energy is released from glucose so that all the other chemical processes needed for life can happen. Do not confuse respiration with breathing.

The word equation for this chemical reaction is
glucose + oxygen → carbon dioxide + water

Testing for Carbon Dioxide in Inhaled and Exhaled Breath
If carbon dioxide is present, it reacts with the limewater (calcium hydroxide dissolved in water) to produce insoluble calcium carbonate that will turn the water milky.

To show experimentally that carbon dioxide is given out during respiration in animals and plants

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
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