How to tell the difference

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Physical/ChemicalProperties and Changes

• How to tell the difference

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Physical property

• Any characteristic of a material that can be
  observed or measured without changing the
  identity of the material

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Examples of Physical Properties..

• Size
• Shape
• Color
• Density
• Texture
• Smell
• State of matter

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Density

• The amount of mass a material has for a given
  volume is DENSITY.
• Density mass/volume

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Same Volume, Different Mass

• A bowling ball and a volleyball have the same
  volume (they take up the same space), but the
  bowling ball is more dense than the volleyball.

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Chemical Property..

• Any characteristic that gives a substance the
  ability to undergo a change that results in a new
  substance.
• Only observable during a chemical reaction.

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Examples of Chemical Properties..

• Flammability- the ability to burn
• Reactivity- how easily it reacts with another
  substance to form something new.

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Physical property

• Substance may seem different, but atoms link up
  in the same way.

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States of Matter
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Physical Change..
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Its a physical change if

• It changes shape or size
• It dissolves.

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Its a physical change if...

• It changes phase (freezes, boils, evaporates,
  condenses)

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Chemical Change

• Changes the identity of the substance
• Makes new substances

Also know as a chemical reaction
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Here are some other examples of chemical
reactions

• raw egg becomes cooked egg
• cake mix becomes cake

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Its a chemical change if.

• It burns
• Temperature changes without heating/cooling

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Its a chemical change if...

• Rotting

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Its a chemical change if...

• It changes color- not all
• It forms a precipitate

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Always a chemical change if..

• Burning
• Bubbling
• Rotting
• Rusting
• Think BBRR..

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What kind of change is it if someone...

• Tears up paper?
• Physical change
• Mixes salt and water?
• Physical change

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What kind of change is it if someone...

• Burns paper?
• Chemical change
• Evaporates salt water?
• Physical change

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What kind of change is it if someone...

• Mixes vinegar and baking soda?
• Chemical change