Science chemistry 0.0 / 5 ? ScienceChemical reactionsGCSEAQA Created by: thiviya2453Created on: 15-01-17 14:32 What is a reaction When two substances mix to form a new one 1 of 5 What is physical change When's it's reversible example butter melting 2 of 5 What is a chemical change When it's irreversible example penny turning green 3 of 5 What is collision theory When particles collide to form energy 4 of 5 What affects the rate of reaction Temperature su 5 of 5
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