Physical and chemical changes
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Transcript of Physical and chemical changes
Bell Ringer
Quietly come in and begin taking the quiz on
your desk.
Physical & Chemical Changes
MeltingSolid Liquid
H2O H2O
Have you made anything new??
Physical property: observed with the senses; determined without changing the matter to a new substance
physical property
Ask yourself is something NEW made?
Physical property: observed with the senses; determined without changing the matter to a new substance
Melting evaporation
color odor
physical property
density taste
Physical Change: a change in size, shape or state of matter; substance does NOT change identity when it undergoes a physical change
Chemical property: indicates how a substance reacts with something else; matter will be changed into a new substance after the reaction
chemical property
Ask yourself is something NEW made?
Chemical property: indicates how a substance reacts with something else; matter will be changed into a new substance after the reaction
Reacts with water Reacts in the air
chemical property
Reacts with other chemicals
Chemical Change: a change in the physical and chemical properties; to change one
substance into another substance
Penny + Acid??
If you make a new substance and it can’t go back----->
chemical change.
5 Signs of Chemical Reaction
1. Gas given off
2. Light or heat given off
3. Color change
4. Solid Precipitate formed
5. Water is formed