science chemical changes revision

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9 Terms

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signs of chemical reaction

Bubbles/gas/freezing

Colour change

New substance

Temp change

Cloudy

Smell

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Displacement

A more reactive metal displaced a less reactive metal in a compound

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Precipitation

A solid that is produced when 2 liquids react

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Catalysts

Speeds up the rate of reaction by providing an alternative route with a lower activation energy

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Exo

Endo

Exo: goes up in heat

Endo:Goes down in heat

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Oxidation

Metal + oxygen = metal oxide

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MASH

Metal + Acid = Salt + Hydrogen

More bubbles = more reactive

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MC+A

Metal carbonate + acid = salt + carbon dioxide + water

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