Physical/Chemical Properties and Changes
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32 Terms
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Physical Properties
Properties that can be observed or measured without changing the chemical structure
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Intensive Properties
Physical properties that do not change with the amount of matter in a sample
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Density
The ratio of mass to volume, how tightly packed molecules are. Physical Property (Intensive)
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Color
Physical Property (Intensive)
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Hardness
Physical Property (Intensive)
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Brittleness
Physical Property (Intensive)
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Temperature
Physical Property (Intensive)
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Boiling and Melting Points
Physical Property (Intensive)
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Specific Heat
Amount of heat a substance needs to absorb to raise the temperature by one degree kelvin. Physical Property (Intensive)
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Irradiance
Amount of light given off. Physical Property (Intensive)
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Ductility
Ability to be stretched into a wire. Physical Property (Intensive)
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Fluidity
How easily a substance flows. Physical Property (Intensive)
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Extensive Properties
Physical properties that change with the amount of matter in a sample.
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Mass
Physical Property (Extensive)
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Volume
The amount of space something takes up. Physical Property (Extensive)
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Chemical Properties
Properties that can be observed and measured during or right after a chemical reaction. They cannot be examined without without reacting the sample.
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Toxicity
Ability to damage living tissue. Chemical Property.
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Flammability
Ability to burn. Chemical Property.
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Heat of Combustion
Amount of energy released when burned. Chemical Property.
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Physical Change
A change that does not change the molecular structure of the sample
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Cutting a sample
Physical Change
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Sanding something
Physical Change
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Changing the state of matter
Physical Change
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Changing the temp of a substance
Physical Change
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Changing the shape of a sample
Physical Change
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Chemical Change
Chemical reactions that change the molecular structure of a sample. After a chemical change, the substance becomes an entirely different substance or a mixture of substances. Atoms are rearranged.
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Many chemical changes are
Irreversible
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5 signs of a chemical change
1. Color change
2. Odor is produced
3. Gas is produced
4. New solid (precipitate) is formed
5. Light or heat is given off
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Electrolysis of water
Decomposition of water caused by and electric current. Chemical Change.
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Milk spoiling
Chemical Change
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Cooking something
Chemical Change
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Malleability
Ability to be reshaped without breaking or cracking