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Physical change
A change in the form or appearance of a substance, but no new substances are formed
Chemical change
A change where a new substance is formed, with different properties
The law of conservation of matter
‘Matter cannot be created or destroyed during a chemical reaction’
Synthesis
Two or more reactants react to form one products
Decomposition
a compound reacts and breaks down into two or more products
Single displacement
A more reactive element replaces another less reactive element on a molecule
Double displacement
two reactants exchange ions to form two new products