Science C3 Revision OCR
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Explain what is meant by the law of conservation of mass?
Atoms cannot be created or destroyed the mass stays the at the start and end of an reaction.
Why does the mass seem to change during some reactions?
Some substances can leave or enter the reaction mixture in a non-enclosed system.
What are half equations?
Half equations are equation where how an ion or atom goes to an atom or an ion showing if it loses or gains electrons
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