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dilanf
on FreezingBlue Flashcards.
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Matter
- Anything that has mass and
- occupies space
- e.g. wood, plastic, humans,
- etc.
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Pure substance
- Matter that contains only
- one kind of particle
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Mixture
- Matter that contains more
- than one kind of particle
- e.g. mechanical mixtures
- & solutions
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Element
- A pure substance that
- cannot be broken down into simpler parts by chemical methods
e.g. oxygen, gold, silicon
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Compound
- A pure substance made up of
- two or more different elements that have been chemically combined
- e.g. water, sodium
- chloride, acetic acid
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Physical property
- A characteristic of a
- substance that can be observed and measured without changing the identity of
- the substance
- e.g. colour, odour, state,
- texture, lustre, malleability, etc.
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Viscosity
- The measure of a substance’s
- resistance to flow
- e.g. water has a lower
- viscosity than molasses
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Melting point
- The temperature at which a
- solid turns into a liquid
- e.g. water’s melting point
- is 0˚c
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Boiling point
- The temperature at which a
- liquid turns into a gas
- e.g. water’s boiling point
- is 100˚c
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Solubility
- The measure of the ability
- of a substance to dissolve into another substance
- e.g. salt is very soluble,
- while hair is not
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Density
- The ration of the mass of a
- substance to the volume it occupies
e.g. measured in g/cm3
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Chemical property
- The ability of a substance
- to change (react) and form new substances
- e.g. reactivity with water,
- reactivity with acid
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Combustibility
- The ability of a substance
- to burn in air
- e.g. dry wood has a greater
- combustibility than wet wood
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Stability
- The ability of a substance
- to remain unchanged
- e.g. fruit have a low
- stability because they rot easily
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Toxicity
- The ability of a substance to cause harmful effects in
- plants and animals
- e.g. mercury has a greater
- toxicity than water
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