 # Density = Mass Volume At 4 o C one gram of pure water occupies one milliLiter or one cubic centimeter. Calculations 1) 43.2 mL of liquid has a mass of.

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Density = Mass Volume At 4 o C 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.

Density as a conversion factor 1) Calculate the mass of 300. mL of alcohol if it has a density of 0.80 g/mL

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

Rounding off Numbers

Rules for Significant figures (zeros) 1) 123456789 2) 23.09 3) 1.2500 4) 0.000066 5) exact numbers 6) 22,200 22,200. 22,200.0

22 mm Rule 4 revisited

Why Significant Figures???

Scientific Notation 0.000 000 000 000 000 000 000 00166 X 602 000 000 000 000 000 000 000

1000 = 10 x 10 x 10 = 10 3 100 = 10 x 10 = 10 2 10 = 10 1 1 = 10 0 0.1 = 1/10 = 1/10 1 = 10 -1 0.01 = 1/100 = 1/10 2 = 10 -2 0.001 = 1/1000 = 1/10 3 = 10 -3

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

Scientific Notation 0.000 000 000 000 000 000 000 00166 X 602 000 000 000 000 000 000 000

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