Science vocab chapter 4

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dilanf
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247338
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Science vocab chapter 4
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2013-11-17 13:18:42
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Science vocab chapter
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Science vocab chapter 4
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  1. Matter
    • Anything that has mass and
    • occupies space

    • e.g. wood, plastic, humans,
    • etc.
  2. Pure substance
    • Matter that contains only
    • one kind of particle

    • e.g. elements &
    • compounds
  3. Mixture
    • Matter that contains more
    • than one kind of particle

    • e.g. mechanical mixtures
    • & solutions
  4. Element
    • A pure substance that
    • cannot be broken down into simpler parts by chemical methods

    e.g. oxygen, gold, silicon
  5. Compound
    • A pure substance made up of
    • two or more different elements that have been chemically combined

    • e.g. water, sodium
    • chloride, acetic acid
  6. 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.
  7. Viscosity
    • The measure of a substance’s
    • resistance to flow

    • e.g. water has a lower
    • viscosity than molasses
  8. Melting point
    • The temperature at which a
    • solid turns into a liquid

    • e.g. water’s melting point
    • is 0˚c
  9. Boiling point
    • The temperature at which a
    • liquid turns into a gas

    • e.g. water’s boiling point
    • is 100˚c
  10. Solubility
    • The measure of the ability
    • of a substance to dissolve into another substance

    • e.g. salt is very soluble,
    • while hair is not
  11. Density
    • The ration of the mass of a
    • substance to the volume it occupies

    e.g. measured in g/cm3
  12. Chemical property
    • The ability of a substance
    • to change (react) and form new substances

    • e.g. reactivity with water,
    • reactivity with acid
  13. Combustibility
    • The ability of a substance
    • to burn in air

    • e.g. dry wood has a greater
    • combustibility than wet wood
  14. Stability
    • The ability of a substance
    • to remain unchanged

    • e.g. fruit have a low
    • stability because they rot easily
  15. 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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