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The International System of Measurement (SI). SI. System of measurement used world wide Makes communication between countries, languages and different measurement systems easy, consistent Uniformed – everyone is “speaking the same language”. Prefixes. Used to change the size of the value
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SI • System of measurement used world wide • Makes communication between countries, languages and different measurement systems easy, consistent • Uniformed – everyone is “speaking the same language”
Prefixes • Used to change the size of the value • Used in front of the base unit • Used to make large numbers smaller and smaller numbers larger • Does not change the value itself
Unit Conversions • Used to change from one sized unit to another • Value does not change only the size of the unit ex: 1 dollar = 100 pennies = 20 nickels = 10 dimes = 4 quarters Value ($1) remains the same, just the size of the unit changes
Tools of Measurement • Equipment used to measure mass, length, volume and temperature • Each tools measures in its own unit • The smaller the unit the more accurate the measurement
M V M D = D V C. Derived Units • Combination of base units. • Volume - length length length 1 cm3 = 1 mL 1 dm3 = 1 L • Density - mass per unit volume (g/cm3)
The Perfect Graph • 6 points all graphs need to have 1. Title 2. Label Axis w/ correct units 3. Choose an appropriate interval for axis (Make it big enough!) 4. Use a straight edge 5. Best fit line 6. slope should be in decimal form.
Mass (g) Volume (cm3) D. Graphing & Density
M D V E. Density • 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
WORK: V = M D V = 25 g 0.87 g/mL M D V E. 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 V = 28.7 mL
WORK: D = M V D = 620 g 753 cm3 M D V D. Density 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 = ? D = 0.82 g/cm3