Physical and Chemical

1
Physical and Chemical

• 3.2

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Whats different?

• We tell different substances from each other by
  their physical and chemical properties.
• Physical property something observed without
  changing the identity of the substance
• Chemical property ability to form new substances

3
The boiling point of a certain alcohol is 78C

1. physical
2. chemical

4
Propane burns in air

1. physical
2. chemical

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Lead is a very dense metal

1. physical
2. chemical

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A metal wire conducts electricity

1. physical
2. chemical

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Platinum does not react with oxygen at room temp.

1. physical
2. chemical

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Changes

• Physical change change that does NOT alter the
  identity of the substance
• Chemical change changes the identity of the
  substance

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Scramble eggs

1. physical
2. chemical

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Crush a piece of chalk

1. physical
2. chemical

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Light a candle

1. physical
2. chemical

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Steam from a shower condenses on a mirror

1. physical
2. chemical