Chemical ____ happen when chemical reactions ____. They involve the ____ of new chemical ____ or compounds. Physical changes do not ____ to new chemical substances ____. In a physical change, a ____ simply changes physical ____, eg from a ____ to a liquid. For example: liquid water becoming ____ (when water ____) is a ____ reaction. However, liquid water ____ into ____ and oxygen, eg when an ____ current is passed through water, is a ____ reaction.

Year 9 Physical and Chemical Changes

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