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Elements and Chemical Bonds

Across
Reactions that release thermal energy
Starting substances in a reaction
Type of change that does not produce new substances
Process where atoms rearrange to form new substances
Lowers the activation energy of a reaction
One element replaces another in a compound
Number of units of a particular substance in a chemical equation
Amount of exposed outer area of a solid
Minimum amount of energy needed to start a chemical reaction
Slows or stops a chemical reaction
Down
A compound breaks down into new substances
Reactions that absorb thermal energy
Substance combines with oxygen and releases energy
Type of change that forms a new substance
Two ions switch places and form new compounds
Substances produced in a reaction
Description of a reaction using element symbols and chemical formulas
Catalyst for reactions in cells
Substances combine to form something new