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 grams. When it contains 42.9 mL of liquid it has a mass of grams. Calculate the density of the liquid in gm/cc.

3) A 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) ) ) ) ) exact numbers 6) 22,200 22, ,200.0

22 mm Rule 4 revisited

Why Significant Figures???

Scientific Notation X

1000 = 10 x 10 x 10 = = 10 x 10 = = = = 1/10 = 1/10 1 = = 1/100 = 1/10 2 = = 1/1000 = 1/10 3 = 10 -3

terameters gigameters megameters kilometers 7.6 meters millimeters micrometers nanometers picometers tera- (T-) trillion giga- (G-) billion mega- (M-) million kilo- (k-) thousand hecto- (h-) hundred deka- (da-) 101 ten Unit of measure deci- (d-) tenth centi- (c-) hundredth milli- (m-) thousandth micro- (µ-) millionth nano- (n-) billionth pico- (p-) trillionth

Scientific Notation X