Basic Units Length meters Mass kilograms Time seconds
Temperature Kelvin Amount Chm Mole Current Amphere Luminous In Candela
Metric Prefixes >1 <1 Mega (M) Micro (m) Kilo (k) Nano(n) >1 <1 Mega (M) Micro (m) Kilo (k) Nano(n) Milli (m) Pico (p)
Metric Prefixes > 0 (G) = 109 (M) = 106 (k) = 103
Metric Prefixes < 0 (m) = 10-3 (m) = 10-6 (n) = 10-9 (p) = 10-12
How close you are to the real answer Accuracy How close you are to the real answer
Precision How well one can repeat his or her work Repeatability
Uncertainty All measurements have a degree of unreliability Usually in the last digit of a measurement
Significant Digits Meaningful digits in a number
Multiplication Uncertainty The answer should have the same number of significant digits as the multiplier with the least number of SD Same for division
Addition Uncertainty When adding, line up decimal place & add The decimal places in the answer should = the least Same for subtraction
Determining Significance All non-zero digits All zeros between non-zero numbers All trailing zeros if there is a decimal place
When do you leave Sig Figs alone? Numbers obtained by counting or by definition are exact numbers. # of students in the classroom 2.54 cm = 1 inch
PERIOD 4 stopped here
Scientific Notation M x 10n M = 1.00 M < 10.00 n = an integer
Conversion Factor Ratio equal to one 12 inches/1 foot Multiply one unit by a conversion to obtain another unit w/o affecting magnitude
PERIOD 4 LEFT OFF HERE
Convert: 2.50 cm to Mm 4.2 ns to ms 3.15 kg to mg
Determine the length in miles of a light year Light year = distance light travels in one year c = 3.0 x 108 m/s 1 mile = 5280 ft 1 inch = 2.54 cm
Convert: 4.35 kg/L to mg/mL 2.31 mm/ns to cm/Ms
Calculate the volume in m3 occupied by 750 kg of gas with 1 Calculate the volume in m3 occupied by 750 kg of gas with 1.50 g/L 1 cm3 = 1 mL
Calculate the mass in kg of a board that has dimensions of 250 mm x 4 Calculate the mass in kg of a board that has dimensions of 250 mm x 4.0 x 104 mm x 2.5 m and had a density of 0.80 g/mL 1 ml = 1 cm3