Presentation on theme: "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."— Presentation transcript:
1 Chemistry Warm UpHow many ounces are there in a gallon. Show your workHow 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 - gTime - second - sTemperature - Kelvin or ºCelsius K or ºCEnergy - Joules- JVolume - Liter - half of a two liter bottle- LAmount of substance - mole - mol
5 Prefixes kilo k 1000 times deci d 1/10 centi c 1/100 milli m 1/1000 micro μ 1/nano n 1/
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 side1L = 1 dm3so 1 L = 10 cm x 10 cm x 10 cm1 L = 1000 cm31/1000 L = 1 cm31 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 water1 kg = 1 L of water
10 Mass1 kg = 2.5 lbs1 g = 1 paper clip1 mg = 10 grains of salt
11 ConvertingkhDdcmhow 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 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 right56
13 k h D d c m Conversions convert 25 mg to grams convert 0.45 km to mm convert 35 mL to litersIt works because the math works, we are dividing or multiplying by 10 the correct number of times.