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BioChem.tri-c.edu

Chapt. 1 - Timberlake

How is WEIGHT different from MASS? Weight - is a measure of the pull of gravity Ex. a man weighs 165 lbs on earth, but only 27.5 lbs on the moon
Unit for mass in metric system GRAM - 454 g = 1lb.
Significant figures In a measured number, significant figures are all the digits including the estimated digit
Measure numbers Measured numbers are obtained when one measures a quantity
How to tell what is a significant number? (4) 1. Not a zero 2. a zero between nonzero digits 3. a zero at the end of a decimal number 4. any digit in a coefficient of a number written in scientific notation
Exact numbers Exact numbers are clearly defined (60 minutes in an hour)
Round off rules (2) if four or less, round down, 5 or more, round up
Multiplication & division-significant numbers In multiplication or division, final answer contains #of significant figures as the measurement with the FEWEST significant figures Ex. 24.65 x 0.67 = 16.5155 - round to 17 (because 0.67 has just TWO significant figures)
Prefixes - trillion, billion, million & thousand 1. trillion - tera 2. billion - Giga 3. Million - MEGA 4. thousand - Kilo
Prefixes (decrease size of unit) tenth, hundredth, thousandth, millionth, billionth, trillionth, quadrillionth
tenth, hundredth, thousandth, millionth, billionth, trillionth, quadrillionth tenth-deci, hundredth-cent, thousandth-milli, millionth-micro, billionth-nano, trillionth-pico, quadrillionth -femto
cm3 - cubic centimeter-dimensions 1 cm x 1 cm x 1 cm- measures VOLUME and equals 1 mL = 1cm3 = 1cc
Mass - how is "weight" recorded? In kilograms
Density RELATIONSHIP of the MASS of object to its VOLUME
Density measurements grams per cubic centimeter (g/cm3) grams per milliliter (g/mL) or grams per liter (g/L)
6.00 divided by 0.2000 30.0 - because when dividing, the answer must have same number of significant figures as the one with fewest digits--sometimes you have to add
d = m divided by V Remember: alphabetically divide so that DENSITY = Mass divided by Volume
Add decimals Answer should have same number of DECIMALS as that having fewest decimal places
1 mL equals (write 3 ways) 1 mL = 1 cm 3power = 1cc = .001 liter
how many 3s, 3p & 3d orbitals are there? 1, 3 & 5 respectively