Physical & Chemical Change

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Physical and Chemical Properties of Matter

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Presentation transcript:

Physical & Chemical Change Chemistry Physical & Chemical Change

Learning Goals I will be able to identify the difference between a physical change and a chemical change.

Chemists classify changes in matter into two categories: Physical changes Chemical changes

Physical Change No new substance is produced. New physical properties MAY appear, but the particles of the starting substance are not changed.

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.

Chemical Change The starting substance is changed to produce something totally new that shows new properties that were not there before.

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.

Learning Goals Revisited I will be able to identify the difference between a physical change and a chemical change.

Please Complete … Phys/Chem Changes worksheet P182 #5 and P186 #4-7 Density Worksheet