Measurement I. Units of Measurement  Number vs. Quantity  SI Base Units & Prefixes  Derived Units  Density Calculations.

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Measurement I. Units of Measurement  Number vs. Quantity  SI Base Units & Prefixes  Derived Units  Density Calculations

A. Number vs. Quantity  Quantity - number + unit UNITS MATTER!!

B. SI Units QuantityBase UnitSymbol Length Mass Time Temp meter kilogram second kelvin m kg s K CurrentampereA

B. SI Units mega-M10 6 deci-d10 -1 centi-c10 -2 milli-m10 -3 PrefixSymbolFactor micro-  nano-n10 -9 pico-p kilo-k10 3

C. Derived Units  Combination of base units.  Volume - length  length  length 1 cm 3 = 1 mL 1 dm 3 = 1 L  Density - mass per unit volume (g/cm 3 ) D = MVMV D M V

D. Density  An object has a volume of 825 cm 3 and a density of 13.6 g/cm 3. Find its mass. GIVEN: V = 825 cm 3 D = 13.6 g/cm 3 M = ? WORK : M = DV M = (13.6 g/cm 3 )(825cm 3 ) M = 11,220 g D M V

D. Density 1) A liquid has a density of 0.87 g/mL. What volume is occupied by 25 g of the liquid? GIVEN: D = 0.87 g/mL V = ? M = 25 g D M V WORK : V = M D V = 25 g 0.87 g/mL V = 28.7 mL

D. Density 2) You have a sample with a mass of 620 g & a volume of 753 cm 3. Find density. GIVEN: M = 620 g V = 753 cm 3 D = ? D M V WORK : D = M V D = 620 g 753 cm 3 D = 0.82 g/cm 3