Chemistry (efnafræði)

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Anonymous
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205458
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Chemistry (efnafræði)
Updated:
2013-03-06 17:26:53
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General chemistry
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  1. Define matter..
    Matter is anything that occupies space and has mass.
  2. Define substance..
    • A substance is matter that has a definite or constant composition and distinct properties.
    • Efnismassi sem hefur vel skilgreinda samsetningu eða eðliseiginleika.
  3. Define mixture..
    A mixture is a combination of two or more substances in which the substances retain their distinct identities.
  4. Homogeneous mixture (Einsleitar blöndur)
    • The combination of the mixture is the same throughout the solution.
    • Samsetning er eins allsstaðar, óháð stað og stund.
    • Example: Sodium chloride in water.
  5. Heterogeneous mixture (Misleitar blöndur)
    • The composition is not uniform.
    • Samsetningin er háð stað og stund.
    • Example: viður, blóðsýni, mjólk o.s.fr.
  6. Define compound..
    • Compound is a substance composed of two or more elements chemically united in fixed proportions.
    • Efni sem eru samansett úr tveimur eða fleiri frumefnum sem eru tengd innbyrgðis í ákveðnum hlutföllum.
    • Example: Vatn (H2O), ammoníak (NH3), glúkósi (C6H12O6).
  7. Physical property (eðliseiginleiki)
    • Physical property can be measured and observed without changing the composition (samsetning) or identity of a substance.
    • Eiginleiki sem tengist eðlishegðun efnis án þess að samsetning þess breytist.
    • Example: suðumark, bræðslumark, eðlismassi, litur.
  8. Chemical property (efnaeiginleiki)
    • To observe chemical property we must carry out a chemical change.
    • For example the statement "Hydrogen gas burns in oxygen gas to form water" describes a chemical property.
    • Efnaeiginleiki felst í samsetningu efnis, efni hvarfast og breytist í annað efni (sem hefur aðra eðliseiginleika).

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