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Chemistry Chpt 14

Observing Change

Physical Change A situation in which there is no change in particles, just the particle arrangement and energy.
Chemical Change A situation in which a chemical reaction takes place and a new substance is formed. During a chemical change energy may be released or absorbed. This means chemical changes are usually very difficult to reverse.
Reactants The chemicals that react together during a chemical reaction.
Products The substances formed from chemical reactions.
Example of Physical Change Melting Chocolate
Example of Chemical Change Burning a Match
Example of a Chemical Reaction carbon+oxygen->carbon dioxide reactants product
Chemical Reaction Atoms rearranging to form a new substance,
Indications of the Occurrence of a Chemical Reaction Colour changes, temperature changes, emitted light and gas bubbles.
Law of Conservation Mass Mass cannot be created or destroyed, so during a physical and chemical change there is no change in overall mass.
Created by: aishlinncosgrove
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