Density = Mass

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Density Mass Volume
At 4oC one gram of pure water occupies one
milliLiter or one cubic centimeter.
Calculations
1) 43.2 mL of liquid has a mass of 50.0 grams.
Calculate the density of the liquid.
2

• An empty graduated cylinder has a mass of
• 113.713 grams. When it contains 42.9 mL
• of liquid it has a mass of 150.607 grams.
• Calculate the density of the liquid in
  gm/cc.

3

• A 89.967 g rock is placed in a graduated
• cylinder containing 44.9 mL of water. The
• new reading was 59.1 mL. Calculate the
• density of the rock in g/mL.

4

• A 5.5 Kg block of metal imeasures 4.60 inches
• by 5.10 cm by 200. mm. Calculate the
  density
• of the metal in g/cc.

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Density as a conversion factor

• Calculate the mass of 300. mL of alcohol if it
• has a density of 0.80 g/mL

6

• Calculate the mass of 150. mL of concentrated
• sulfuric acid. (density 1.80 g/mL)

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• Rounding off Numbers

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Rules for Significant figures (zeros)

• 123456789
• 23.09
• 1.2500
• 0.000066
• exact numbers
• 22,200
• 22,200.
• 22,200.0

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Rule 4 revisited
22 mm
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Why Significant Figures???
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Scientific Notation
0.000 000 000 000 000 000 000 00166 X 602 000
000 000 000 000 000 000
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1000 10 x 10 x 10 103 100 10 x 10
102 10 101 1 100 0.1
1/10 1/101 10-1 0.01 1/100
1/102 10-2 0.001 1/1000 1/103
10-3
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terameters gigameters
megameters
kilometers 7.6 meters millimeters
micrometers nanometers
picometers
tera- (T-) 1012 1 trillion giga- (G-) 109
1 billion mega- (M-) 106 1 million kilo- (k-)
103 1 thousand hecto- (h-) 102 1
hundred deka- (da-) 101 ten Unit of
measure deci- (d-)10-1 1 tenth centi-
(c-)10-2 1 hundredth milli- (m-)10-3
1 thousandth micro- (µ-)10-6 1
millionth nano- (n-)10-9 1 billionth pico-
(p-)10-12 1 trillionth
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Scientific Notation
0.000 000 000 000 000 000 000 00166 X 602 000
000 000 000 000 000 000
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