Pure or Mixture Pure substance o Element o compound Mixture o Homogeneous mixture can t tell it s a mixture ex salt in water o Heterogeneous mixture can tell it s a mixture ex salt and pepper ConcepTest In the electrolysis of water to make oxygen and hydrogen which is a mixture A Water C Hydrogen B Oxygen D None of these Quantity Unit Symbol meter kilograms seconds Amperes Kelvin degrees Candela moles m kg s A K cd mol Length Mass Time Current Temperature Luminous intensity Amt substance Si systeme international Metric Prefixes Name Symbol Tera Giga Mega Kilo Deka Deci Centi Milli Micro Nano Pico Femto T G M k da D d c m n p Multiplier 10E12 10E9 10E6 10E3 10E1 10E 1 10E 2 10E 3 10E 6 10E 9 10E 12 10E 15 ConcepTest Which is the largest A 0 001 meter meter C 10 000 millimeters meter B 105 micrometer meter D 108 nanometers meter ConcepTest What is the area of the black paper expressed with the correct number of sig figs Calculator shows 109 7677 A 8 21 x 13 371 109 77 C 8 2 x 13 37 110 B 8 2 x 13 37 109 8 D 8 2 x 13 4 100 Arithmetic functions Use the number w all sig fig Do the math Apply rule Multiply division Smaller of sig fig Add Subtract use decimal of least decimal places o Ex 8 2 13 37 21 57 21 6 smallest decimal is to the tenth place Unit conversion 13 37 cm inches Dimensional analysis OR unit factor conversion 13 37 x 1 13 37 Unit Factor 2 54 cm 1 in 1 in 2 54 cm 1 13 37 cm x 1 in 2 54 cm 5 26 in ConcepTest To convert the volume of a 2 0 L Coke bottle to fluid ounces oz the most useful unit factor would be A 2000 mL 2 0 L C 67 6 oz 2 0 L B 64 oz 2 qt D 2 0 L 67 6 oz 1 L 1000 mL 1 L 1 06 quarts 32 fl oz 1 quart