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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.

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**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?

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**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.

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**Base Units Length - meter - more than a yard - m**

Mass - grams - about a raisin - g Time - second - s Temperature - Kelvin or ºCelsius K or ºC Energy - Joules- J Volume - Liter - half of a two liter bottle- L Amount of substance - mole - mol

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**Prefixes kilo k 1000 times deci d 1/10 centi c 1/100 milli m 1/1000**

micro μ 1/ nano n 1/

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**Length kilometer - about 0.6 miles centimeter - less than half an inch**

millimeter - the width of a paper clip wire

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**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

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**Volume 1 L about 1/4 of a gallon - a quart**

1 mL is about 20 drops of water or 1 sugar cube

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**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

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

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Converting k h D d c m 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.

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**k h D d c m Conversions 5 6 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

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**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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