Chemical and Physical Changes
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9 Terms
Chemical Change
An irreversible change where new substances are formed.
Physical Change
A reversible change where no new substance is formed.
Reactants + Products
In a chemical reaction, reactants combine to form new products.
Signs of a Chemical Reaction
Flames/sparks, bad smell, temperature change, fizz/bang, colour change, reactants used up, new substance formed.
Irreversible Change
A change that cannot easily be undone (e.g. burning paper).
Reactant
The starting substance(s) in a chemical reaction
Product
The substance(s) formed after a chemical reaction.
Physical Change
A reversible change where no new substance is formed.
Change of State
A change between solid, liquid, or gas (e.g. melting, freezing, boiling).
Note 
Flashcards (36)