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What is an atom?
The smallest particle of an element that retains its chemical properties
What is a molecule?
The smallest particle of a substance that can exist independently and has all properties of that substance
What is an element?
A pure substance made of only one type of atom that cannot be broken down further
What is a compound?
A substance made of two or more elements chemically combined in fixed proportions
State the Law of Conservation of Mass.
Mass can neither be created nor destroyed in a chemical reaction — total mass of reactants equals total mass of products
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