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Chemistry Warm Up

Chemistry Warm Up. How many ounces are there in a gallon. Show your work How many inches are there in a mile. Show your work. Measuring. Numbers are only half of a measurement. Consider, “It is 10 long.” 10 what? Numbers without units are meaningless. How many feet in a yard? A mile?

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Chemistry Warm Up

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  1. Chemistry Warm Up • How many ounces are there in a gallon.Show your work • How many inches are there in a mile.Show your work.

  2. Measuring • Numbers are only half of a measurement. • Consider, “It is 10 long.” • 10 what? • Numbers without units are meaningless. • How many feet in a yard? • A mile? • A rod?

  3. The Metric System • Easier to use - decimal system. • Every conversion is by some power of 10. • A metric unit has two parts. • A prefix and a base unit. • prefix tells you how many times to divide or multiply by 10.

  4. Base Units • Length - meter - more than a yard - m • Mass - grams - about a raisin - g • Time - second - s • Temperature - Kelvin or ºCelsiusK or ºC • Energy - Joules- J • Volume- Liter - half of a two liter bottle- L • Amount of substance - mole - mol

  5. Prefixes • kilo k 1000 times • deci d 1/10 • centi c 1/100 • milli m 1/1000 • micro μ1/1000000 • nano n 1/1000000000

  6. Length • kilometer - about 0.6 miles • centimeter - less than half an inch • millimeter - the width of a paper clip wire

  7. Volume • calculated by multiplying L x W x H • Liter the volume of a cube 1 dm (10 cm) on a side • 1L = 1 dm3 • so 1 L = 10 cm x 10 cm x 10 cm • 1 L = 1000 cm3 • 1/1000 L = 1 cm3 • 1 mL = 1 cm3

  8. Volume • 1 L about 1/4 of a gallon - a quart • 1 mL is about 20 drops of water or 1 sugar cube

  9. Mass • Weight is a force. Mass is the amount of matter. • 1 gram is defined as the mass of 1 cm3 of water at 4 ºC. • 1000 g = 1000 cm3 of water • 1 kg = 1 L of water

  10. Mass • 1 kg = 2.5 lbs • 1 g = 1 paper clip • 1 mg = 10 grains of salt

  11. k h D d c m Converting • how far you have to move on this chart, tells you how far, and which direction to move the decimal place. • The box is the base unit, meters, Liters, grams, etc.

  12. k h D d c m Conversions • Change 5.6 m to millimeters • starts at the base unit and move three to the right. • move the decimal point three to the right 5 6 0 0

  13. k h D d c m Conversions • convert 25 mg to grams • convert 0.45 km to mm • convert 35 mL to liters • It works because the math works, we are dividing or multiplying by 10 the correct number of times.

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