1. Know 5 basic units Be able to combine base units Be able to convert base units to different sizes using prefixes Be able to do math with units. Be able to use a few non-standard (but traditional) units used frequently in chemistry.

3. Quantity being measured Length Mass Time Temperature Amount of Substance (counting atoms!) Corresponding Unit meter (39.36 inches) kilogram (not gram!, 2.2 lbs ) second Kelvin (not o C) mole

4. Combined Unit m/s L x W or m 2 L x W x H or m 3 kg/m 3 mole/m 3 speed area volume density concentration Quantity being measured

6. Volume – these 4 are equivalent 1 dm 3 1000 cm 3 1 Liter (L)1000 milliliters (mLs) 0.560 dm 3 is equal to how many mLs?

7. o C = K - 273 K = o C + 273 o F = ( o C + 40) x 9/5 - 40 o C = ( o F + 40) x 5/9 - 40

8. Same units add or subtract w/o unit change: 3 m + 5 m = 8 m Same quantity units with different prefixes must be converted before adding or subtracting: 300 K + 3 kK = 3300 K Different quantity units can’t be added or subtracted: 3 sec - 4 moles = ???

9. When same units multiply or divide the result is a combined unit: 3 m x 5 m = 15 m 2 Same quantity units with different prefixes must be converted before multiplying or dividing: 300 cm x 4 m = 12 m 2 or 120,000 cm 2 Different quantity units can be multiplied or divided: 3 moles ÷ 4 L = 0.75 mol/L