physical & chemical change. chemists classify changes in matter into two categories: physical...
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ChemistryPhysical & 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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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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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.