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A chemical substance that is present at the start of a chemical reaction
reactants
the substances that are formed by the chemical change
products
A chemical change in which a substance combines with oxygen, as when iron oxidizes, forming rust
Oxidation
a measure of how quickly a specific material is capable of catching fire and burning.
Flammability
a principle stating that mass cannot be created or destroyed.
conservation of mass
mass of products
What is the mass of the reactants equal to?
120 g
If the mass of the products measured 120 g, what would be the mass of the reactants?
combined, separated, or rearranged
In chemical reactions, atoms are
