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Ch. 2 - Measurement I. Units of Measurement (p.34-45)  Number vs. Quantity  SI Base Units & Prefixes  Derived Units  Density Calculations.

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Presentation on theme: "Ch. 2 - Measurement I. Units of Measurement (p.34-45)  Number vs. Quantity  SI Base Units & Prefixes  Derived Units  Density Calculations."— Presentation transcript:

1 Ch. 2 - Measurement I. Units of Measurement (p.34-45)  Number vs. Quantity  SI Base Units & Prefixes  Derived Units  Density Calculations

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

3 B. SI Units Quantity & Symbol Base Unit Unit Symbol Length- I Mass- m Time- t Temp- T meter gram second kelvin m g s K Current- IampereA

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

5 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

6 Problem Solving Steps  1 Givens:  2 Unknowns:  3 Equations:  4 Answer:

7 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

8 Problem Solving Steps  1 Givens: Include quantity, number, & unit symbols  2 Unknowns: Include quantity & unit symbols  3 Equations: Base equation & manipulated equation  4 Answer: Do the units agree? Is it reasonable?

9 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

10 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


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