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42 Cards in this Set

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The Scientific method
A logical approach to solving problems by observing and collecting data, formulating hypothesis, testing hypothesis, and formulating theories that are supported by data
Observing
Uses the senses to obtain information
qualitative
discriptive data
quantitative
numerical data
System
A system is a specific portion of matter in a give region of space that has been selected for study during an experiment or observation.
Hypothesis
A testable statement
constant
during an experiment the conditions that remain constant
variable
In an experiment the condition that changes
Model
A model in science is more than a physical object. It is often an explanation of how phenomena occur and how data and events are related
Theory
A broad generalization that explains a body of facts or a phenomena
Quantity
Something that has size, magnitude, and amount.
SI
Le systeme International d'Unites
Weight
the measure of the gravitational pull on matter
Derived Units
Combinations of SI base units
Volume
the amount of space occupied by and object.
Density
The ratio of mass to volume, or mass divided by volume.
Conversion factor
a ratio derived from the equality between two different units that can be used to convert from one unit to the other
Dimensional analysis
a mathematical technique that allows you to use units to solve problems involving measurements.
Accuracy
the closeness of a measurement to the correct or accepted value of the quantity measured
Precision
to closeness of a set of measurements of the same quantity made in the same way
Significant Figures
in a measurement consists of all the digits known with certainty plus one final digit, which is uncertain or estimated
Scientific notation
numbers are written in the form of M x 10^n, where the factor M is a number greator then or equal to one but less than 10 and n is a whole number
Directly proportional
two quantities are """"" to each other if dividing one by the other gives a constant value
Inversely proportional
two products are """""to each other if their product is constant
Area (equation)
length x width
Volume (equation)
length x width x height
Density (equation)
Mass/volume
Energy (equation)
force x length
Molar mass (unit)
Kilograms per mole, Kg/m^3
Molar volume (unit)
cubic moles per mole, m^3/mol
Area (unit abbr.)
m^2, square meter
Volume (unit abbr.)
m^3, cubic meter
Density
kilograms per cubic meter, kg/m^3
Tera
T, 10^12
Giga
G, 10^9
Mega
M, 10^6
Kilo
k, 10^3
Hecto
h, 10^2
deci
d, 10^-1
centi
c,10^-2
milli
m, 10^-3
Percentage error (equation)
Percentage error= Value experimental-Value accepted/value accepted X100