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Physical & Chemical Change
Chemistry Physical & Chemical Change
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Learning Goals I will be able to identify the difference between a physical change and a chemical change.
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Chemists classify changes in matter into two categories:
Physical changes Chemical changes
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Physical Change No new substance is produced.
New physical properties MAY appear, but the particles of the starting substance are not changed.
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No new substance is made, and all changes are reversible.
In a physical change, the matter involved can experience a change in one of the following criteria: Change in SIZE (cutting a gold block in half) Change in SHAPE (making a paper airplane) Change in STATE (ice cube melting) Making a SOLUTION (salt dissolved in water) No new substance is made, and all changes are reversible.
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Chemical Change The starting substance is changed to produce something totally new that shows new properties that were not there before.
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Chemical changes are difficult to impossible to reverse.
In a chemical change, the matter involved can experience a change in one of the following criteria: Change in COLOUR (iron nail producing red rust) Change in ODOUR (garbage rotting) Change in TEMPERATURE (cold pack) LIGHT IS GIVEN OFF (fire-fly) BUBBLES OF A GAS are formed (bubbles not caused by heat) NEW SOLID is made from mixing two solutions (precipitate) Chemical changes are difficult to impossible to reverse.
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Learning Goals Revisited
I will be able to identify the difference between a physical change and a chemical change.
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Please Complete … Phys/Chem Changes worksheet P182 #5 and P186 #4-7
Density Worksheet
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