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Measurement & Unit Conversions Reading Ch 2.1-2.4 (pp. 31-61)

Measurement & Unit Conversions Reading Ch 2.1-2.4 (pp. 31-61). Why would chemistry students be interested in unit conversions? Measurements- involve a number & a unit Different measurement systems -English- (lb.,mile, inch, cup, gallon, etc.) -Metric- (gram, meter, liter, etc.).

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Measurement & Unit Conversions Reading Ch 2.1-2.4 (pp. 31-61)

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  1. Measurement & Unit ConversionsReading Ch 2.1-2.4(pp. 31-61) Why would chemistry students be interested in unit conversions? • Measurements- involve a number & a unit • Different measurement systems -English- (lb.,mile, inch, cup, gallon, etc.) -Metric- (gram, meter, liter, etc.)

  2. Unit conversions, con’t • Use a T-chart to solve unit conversions- this is a simple method to use equalities to cancel out unwanted units. • Equalities represent 2 numerical values and their units that are equal to each other and therefore be converted. 1 mile = 5280 ft.

  3. T-Chart Conversion Problems 1. How many inches in 2.1 miles? • How many liters in 68 gallons? (HINT: 1 liter = 1.0567 quarts) • How many seconds in 4.5 score of years?(1 score = 20 years) • How many grams in 0.95 pounds of hamburger?(454 g=1 lb.) 5. If there are 8 fluid ounces in a cup, how many fluid ounces in 4.9 gallon?

  4. Base units Length- meter Mass- gram Volume-liter Time- seconds Amount of substance-mole Metric System (aka- SI System)**Units are made of prefix + base unit

  5. Less than 1 Deci- 10-1 Centi- 10-2 Milli- 10-3 Micro- 10-6 Nano- 10-9 Greater than 1 Deka- 101 Hecto- 102 Kilo- 103 Mega- 106 Giga- 109 Prefixes- are added to base units to change the value

  6. Examples- • Kilogram = 1000 grams or 103 grams • Millisecond = .001 second or 10-3 second • What would the unit be for 100 liters? • Answer: Hectoliter or 102 liters • What would the unit be for 0.01 meter? • Answer: Centimeter or 10-2 meter

  7. Conversions w/ Metric units? • Use t-charts. • Use equalities • Solve for wanted unit.

  8. Metric Conversions Ex. Convert 40 kilograms to grams. 40 kg 1000 grams = 40,000 grams 1 kg

  9. Practice with Metric Conversions Convert 6.5 kg to mg Convert 870 dam to cm. Convert 7.80 hL to mL.

  10. Metric Equivalents** the base units (in bold) are interchangeable • 1,000,000,000 nanometers = 1 meter • 1,000,000 micrometers = 1 meter • 1000 millimeters = 1 meter • 100 centimeters = 1 meter • 10 decimeters = 1 meter

  11. Metric Equivalents con’t • 10 meters = 1 dekameter • 100 meters = 1 hectometer • 1000 meters = 1 kilometer • 1,000,000 meters = 1 megameter • 1,000,000,000 meters = 1 gigameter

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