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2010-12-11 13:24:12
Chemistry semesters

chemistry semesters review
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  1. Physical Properties:
    • A characteristic that can be observed or measured without changing the sample's composition.
    • Intensive Property: independent of the amount os subtstance (density, scent).
    • Extensive Properties: dependent on the amount of substance present (length, volume, mass).
  2. Chemical Property:
    The ability of a substance to combine with or change into one or more other substances (iron forming rust when combines with the oxygen in air).
  3. Physical Change:
    • A change which alters a substance without changing its composition.
    • Phase change: a transition of matter from one state to another (physical change).
    • *condensation, solidification, melting and boiling points, porosity, stability.
  4. Chemical Change:
    • A process that involves one or more substances changing into new substances
    • Reactants: starting substances
    • Products: are the new subtances formed
    • *decompose, explode, rust, oxidize, corrode, tarnish, ferment, burn, rot.
  5. Observations that suggest a chemical change occurred:
    • Production of gas, bubbles, odor
    • Release or absorption of energy
    • Change of temperature
    • Giving off light
    • Change in color
    • Formation of a precipitate
  6. Law of conservation of mass:
    During a chemical reaction the mass of products is equal to te mass of the reactants.
  7. Elements:
    Are the simplest form of matter that has its unique set of properties
  8. Compounds:
    a substance that contains two or more elements chemically combined in a fixed proportion.
  9. Mixture:
    • A physical blend of two or more componens.
    • Homogenous Mixture: Composition os uniform/ solution. (water, tea, liquids)
    • Heterogenous: it wis not uniform (pizza, salad)
  10. Pure Substances:
    Have fixed composition.
  11. Alloys:
    • Brass: zinc and copper
    • Stainless steel: ion and chromium
    • Bronze: is an alloy
    • Aluminum: is an alloy
    • Karat gold: gold and other metals