## Chemistry 121

 km → mile conversion
 1 km = 2.56 miles
 mile → foot conversion
 1 mile = 5,280 feet
 pound → gram conversion
 1 pound = 453.6 grams
 inch → centimeter conversion
 1 inch = 2.54 cm
 quart → liter conversion
 1 quart = 0.946 L
 precision vs. accuracy
 precision-how closely one’s measurements agree with one another ; accuracy-how closely one’s measurements agree with the actual value
 Rules for multiplication and division of significant figures:
 The answer contains the same number of significant figures as the measurement with the fewest number of significant figures
 Rules for addition and subtraction of significant figures
 Answer has the same number of decimal places as the measurement with the fewest decimal places
 Rules for significant figures:
 1. Zeros between non-zero digits are always significant   2. Zeros at the beginning of a number are never significant   3. Zeros at the end of a number are significant if the number contains a decimal point
 Density
 mass/volume
 mL = ____?
 cm3
 Liter = _____?
 dm3
 Formula for volume of a cube:
 (length)3
 Formula for celcius → fahrenheit
 F = 9/5 (celcius) + 32
 Formula for fahrenheit → celcius
 C = 5/9 (Fahrenheit-32)
 Formula for celcius → Kelvin
 K = celcius + 273.15
 SI unit for luminous intensity
 candela (cd)
 SI unit for electric current
 Ampere (A)
 SI unit for the amount of a substance
 mole (mol)
 SI unit for temperature
 Kelvin (K)
 SI unit of time
 second (s)
 SI unit of length
 meter (m)
 SI unit of mass
 kilogram (kg)
 Giga-
 abbreviation: G meaning:109
 Mega-
 abbreviation: M meaning: 106
 Kilo-
 abbreviation: k meaning: 103
 Deca-
 abbreviation: dec meaning: 101
 Deci-
 abbreviation: d meaning: 10-1
 Centi-
 abbreviation: c meaning: 10-2
 Milli-
 abbreviation: m meaning: 10-3 Let us write you a custom essay sample on Chemistry 121 For Only \$13.90/page ORDER NOW
 Micro-
 abbreviation: μ meaning: 10-6
 Nano-
 abbreviation:n meaning: 10-9
 Pico-
 abbreviation: p meaning: 10-12
 Femto-
 abbreviation: f meaning: 10-15
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