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What is the law of conservation of mass?
No atoms are lost or made during a chemical reaction
In a chemical reaction, is there any change in the overall mass of the substances?
No. The overall mass of the products will be exactly the same as the overall mass of the reactants
Give 2 reasons why the total mass may appear to change during a chemical reaction
Gases from the air may react with the chemicals in the beaker, increasing the mass
Gases may escape from the beaker into the air, decreasing the mass
What is the rule for balancing equations?
Total number of reactants = Total number of products