AP Chem Take out Safety Contract if you have it signed Get into “quiz seats”. Take Elements/Ions Quiz If given the name, provide the symbol If given the symbol, provide the name After Quiz, work on sig figs and density warm up Reminder: Unit 1 Multiple Choice Packet due Wed 9/12

29 11.21 0.1403 560 27 9270

660 g 28.8 mL 56.7 g/weight 0.784 g/mL

Dimensional Analysis Used to convert from one unit to another. Involves setting up conversion factors to cancel units until you have the proper unit in the proper place. When solving, multiply all the values across the top and divide by all the numbers on the bottom. Round off the final answer (do not round in between steps) to the proper number of significant figures. *Note: exact values used in conversion factors (i.e. 1 m = 100 cm) do not limit the number of significant figures in a calculation (it’s a known value, there’s no measurement error associated with it).

Converting between metric units. Prefixes can be placed in front of the base unit to indicate a larger or smaller quantity; based on powers of 10. Prefixes at the top of the chart represent a larger amount or quantity. Prefixes at the bottom of the chart represent a smaller amount or quantity.   x1000 x10 x10 x10 x10 x10 x10 x1000 x1000

65,000 g 0.125 L 7.34 x 10-7 m

1600 mL 0.075 kg 0.20 L/wk 194,040 lights 4.01 m/s