q1 retest chemistry

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Last updated 4:34 PM on 10/9/26
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8 Terms

1
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Intensive property

A property (such as density) that’s independent of the amount of a given substance

Ex: density of aluminum is the same whether you have g or kg

2
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Extensive property

A property (such as mass) that depends on the amount of a given substance

Ex: 500g of aluminum is lighter than 1000g

3
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Sig fig rules

  1. ALL NONZERO DIGITS ARE SIGNIFICANT (28.03, 0.0540)

  2. INTERIOR ZEROES ARE SIGNIFICANT (408, 7.0301)

  3. LEADING ZEROES ARE NOT SIGNIFICANT (0.0032, 0.00006)


4
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Trailing zeroes rules

  • AFTER A DECIMAL ARE ALWAYS SIGNIFICANT (45.000, 3.5600)

  • BEFORE DECIMAL POINT + AFTER A NONZERO NUMBER ARE ALWAYS SIGNIFICANT (140.00, 2500.55)

  • BEFORE AN IMPLIED DECIMAL POINT ARE AMBIGUOUS + SHOULD BE AVOIDED VIA SCIENTIFIC NOTATION

    • 1.20 × 10E3 =12,000 2 sig figs; 1.20 × 10E3 =3 sig figs, etc.


5
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Exact numbers

Numbers that have no certainty + thus do not limit number of Sig figs in any calculation; HAS UNLIMITED SIG FIGS

6
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Sig fig addition/subtraction

  • quantity with the FEWEST DECIMAL PLACES determines the number of DECIMAL PLACES IN ANSWER

  • Focus is on DECIMAL PLACES


7
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Sig fig multiplication/division

  • quantity with the FEWEST SIG FIGS determines the number of SIG FIGS in answer

  • Focus is on SIG FIGS


8
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