Ch.2: Measurement and Problem Solving Flashcards
(22 cards)
2 rules to express a number in scientific notation:
- move the decimal point to obtain a number between 1-10
2. Positive- right Negative- left
6 rules to determine the number of significant figures in a number
- all NONZERO digits are significant
- ZEROS BETWEEN NUMBERS are significant
- Zeros to the right of a nonzero number that fall after a decimal point are significant
- ZEROS to the LEFT of the first nozero number are not significant (.0005)
- Zero’s with no decimal point are not significant
The most convenient system for science measurement is based on the metric system and is called
International System SI
the base unit of length
meter
the base unit of mass
kilogram
the base unit of time
seconds
the _____ of an object is a measure of quantity of matter within it, while the weight of an object is a measure of the gravitational pull on that matter
mass
List: kilo
SYMBOL
MEANING
MULTIPLIER
K
thousand
10^3
Hecto:
SYMBOL
MEANING
MULTIPLIER
h
hundred
10^2
Deca:
SYMBOL
MEANING
MULTIPLIER
da
ten
10
Deci:
SYMBOL
MEANING
MULTIPLIER
d
tenth
10^-1
Centi
SYMBOL
MEANING
MULTIPLIER
c
hundreth
10^-2
milli
SYMBOL
MEANING
MULTIPLIER
m
Thousandth
10^-3
micro
SYMBOL
MEANING
MULTIPLIER
u
Millionth
10^-6
nano
SYMBOL
MEANING
MULTIPLIER
n
billionth
10^-9
Conversion Equivalents: inches=centimeters
1 inch=
2.54 centimeters
Conversion Equivalents: quart=pints
1 quart=
2 pints
Conversion Equivalents: Quart=mL
1 quart=
946 mL
Conversion Equivalents: Pounds to Kg
1 kg
2.2 pounds
4 step Problem-Solving Strategy
identify the given information
identify what you must find
Strategize
Solve
EQUATION OF DENSITY
MASS/ Volume
Density of water
1.0
