A substance consisting of only one type of matter

Cannot be broken down any further

Hydrogen (H)

Can be separated by physical means

Water- (H20)

Can only be separated by a chemical reaction

Chemical or physical change: freezing water

Chemical or physical change: boiling water

Chemical or physical change: chopping wood

Chemical or physical change: mixing cake batter

Chemical or physical change: baking a cake

Chemical or physical change: ripping paper

Chemical or physical change: burning wood

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