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Chemistry

Grade 10: Physical and Chemical Change

TermDefinition
Physical change (1) No new substances are formed. Energy changes are small in relation to chemical changes. Mass, numbers of atoms and molecules as being conserved.
Physical change (2) Describe the rearrangement of molecules during physical changes, e.g. Molecules separate when water evaporates to form water vapour. When ice melts molecules become disorderly arranged due to breaking of intermolecular forces
Chemical change New chemical substances are formed. Energy changes are much larger than those of the physical change. Mass and atoms are conserved, but the number of molecules is not.
Endothermic reaction Energy is absorbed during the reaction
Exothermic reaction Energy is released during the reaction.
Created by: StiKManLabs
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