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Matter
Anything that has mass and occupies space
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Pure Substance
- Matter that contains only one kind of particle
- i.e.- Helium and Water
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Mixture
- Matter that contains more than one kind of particle
- i.e.- Salt water, Air
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Element
- A pure substance that cannot be broken down into ssimpler parts by chemical methods
- i.e.- Heluim
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Compound
- A pure substance made up of two or more different elements that are chemically combined
- i.e.- Water
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Physical Property
- A characteristic of a substance that can be observed and measured without changing the identity of the substance
- Can be either quantitative or qualitative
- i.e.- Hardness, Viscosity, Colour, State
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Viscosity
- The measure of a substance's resistance to flow
- The more viscous a fluid is, the slower it flows
- Water and molasses are two fluids with very different viscosities
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Melting Point
- The temperature at which a solid turns into a liquid
- i.e.- Waters melting point is 0 degrees celcius
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Boiling Point
- The temperature at which a liquid turns into a gas
- i.e.- Waters boiling point is 100 degrees celcius, yet heliums boiling point is -269 degrees celcius
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Solubility
- A measure of the ability of a substance to dissolve in another substance
- i.e.- Salt is a solute that easily dissolves in water to produce a saltwater solution
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Chemical Property
The ability of a substance to change or react, and to form new substances
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Combustibility
The ability of a substance to burn in air
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Stability
The ability of a substance to remain unchanged
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Toxicity
The ability of a substance to cause harmful effects in plants and animals
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