Measurement I. Units of Measurement Number vs. Quantity

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Presentation transcript:

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

A. Number vs. Quantity Quantity - number + unit (actually measure) Base unit- defined unit in a system of measurement. UNITS MATTER!!

B. SI Units Quantity Base Unit Symbol Length meter m Mass gram g Time second s Temp kelvin K Volume liter L Amount of substance Mole Mol

B. SI Prefixes Prefix Symbol Meaning Kilo K 1000 Hecto H 100 Deka Da Deci D .1 Centi C .01 Milli M (lower case) .001

D M V D = M V C. Derived Units Combination of base units. Speed- distance per unit time (m/hr) Density - mass per unit volume (g/cm3) Force- newtons per unit area (n/m2) D M V D = M V

D M V D. Density V = 825 cm3 M = DV D = 13.6 g/cm3 An object has a volume of 825 cm3 and a density of 13.6 g/cm3. Find its mass. GIVEN: V = 825 cm3 D = 13.6 g/cm3 M = ? WORK: M = DV M = (13.6 g/cm3)(825cm3) M = 11,220 g D M V

D M V D. Density D = 0.87 g/mL V = M V = ? M = 25 g V = 25 g 0.87 g/mL 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 WORK: V = M D D M V V = 25 g 0.87 g/mL V = 28.7 mL

D M V D. Density M = 620 g D = M V = 753 cm3 D = ? D = 620 g 753 cm3 2) You have a sample with a mass of 620 g & a volume of 753 cm3. Find density. GIVEN: M = 620 g V = 753 cm3 D = ? WORK: D = M V D M V D = 620 g 753 cm3 D = 0.82 g/cm3