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general chemestry 121
chemL121
57
Chemistry
Undergraduate 1
01/13/2009

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Term
physics
Definition
concerned with the description and understanding of nature.
Term
standard unit
Definition
officially accepted unit of measurement
Term
systems of units
Definition
group of standard units and their combination.
Term
international system of units
Definition
modern version of the metric system. officially abbreviated as SI.
Term
base units
Definition
meter and kilogram
Term
derived units
Definition
expressed in terms of combination of base units.
Term
length
Definition
the base quantity used to measure distances or dimensions in space
Term
Meter (m)
Definition
the SI unit for length.
Term
mass
Definition
is the base quantity used to describe amounts of matter.
Term
Kilogram (kg)
Definition
the SI unit of mass
Term
weight
Definition
is the gravitational attraction that the earth exerts on the object
Term
time
Definition
is the continuous, forward flow of events
Term
second(s)
Definition
the SI unit of time
Term
SI has seven base units for seven base quantities.
Definition
(1)Length, (2)Mass, (3)Time, (4)Electric Current, (5)Temperature in kelvins(K), (6)amount of substance in moles(mol), (7)Luminous intensity in candelas.
Term
second
Definition
time
Term
Kelvin(K)
Definition
temerature
Term
mole(mol)
Definition
amount of substance
Term
Candela(cd)
Definition
luminous intensity
Term
mks system
Definition
meter-kilogram-seccond
Term
cgs system
Definition
centimeter-gram-second
Term
fps system
Definition
foot-pound-second
Term
Volume
Definition
the SI standard unit of volume is the cubic meter
Term
unit analysis
Definition
using units to check equations
Term
Density (p)
Definition
Mass over Volume
Term
Conversion factors
Definition
equivalence statements expressed in the form of ratios.
Term
exact numbers
Definition
numbers without any uncertainty or error.
Term
measured numbers
Definition
are numbers obtained from measurement processes and thus generally have some degree of uncertainty or error
Term
significant figures
Definition
the significant figures in any measurement are the digits that are known with certainty, plus one digit that is uncertain.
Term
order-of-magnitude calculations
Definition
means that we express a quantity of the power of 10 closest to the actual value
Term
Matter
Definition
the physical material of hte universe, it is anything that has mass and occupies space
Term
property
Definition
is any characteristic that allows us to recognize a particular type of matter and to distinguish it from other types.
Term
elements
Definition
elementary substances
Term
atoms
Definition
the small building blocks of matter.
Term
molecules
Definition
two or more atoms are joined together in specific shapes.
Term
chemistry
Definition
the study of the properties and behavior of matter
Term
states of matter
Definition
differ in some of their simple observable properties
Term
gas
Definition
has no fixed volume or shape. it conforms to the volume and shape of its continer. a gas can be compressed to occupy a smaller volume
Term
liquid
Definition
has a distinct volume independent of its container but has no specific shape.
Term
pure substances
Definition
reffered to simply as a substance is matter that has distinct properties and a composition that does not vary from one sample to another.
Term
Elements
Definition
can't be composed into similar substances.
Term
compounds
Definition
substances composed of two or more elements.
Term
law of constant composition
Definition
the observation that the elemental composition of a pure compound is always the same.
Term
solutions
Definition
homogeneous mixtures
Term
physical properties
Definition
can be observed without changing the identity and composition of the substance.
Term
chemical properties
Definition
the way a substance may change or react to form other substances.
Term
intensive properties
Definition
they do not depend on the amount of the sample being examined, and are particularly useful because it helps identify substances.
Term
extensive properties
Definition
depend on the quantity of the sample, these relate to the amount of substance present
Term
physical change
Definition
a substance changes its physical appearance but not its composition.
Term
changes of state
Definition
when a substance changes from either liquid, solid or gas to another state.
Term
chemical change
Definition
happens when a substance is changed chemically
Term
scientific law
Definition
is a concise verbal statement or a mathematical equation that summarizes a broad variety of observations and experiences
Term
Metric system
Definition
units used for scientific measurements.
Term
SI Units
Definition
has seven base units from which all others units are derived.
Term
Celsius scale
Definition
this is the temperature scale commonly employed in scientific studies.
Term
Kelvin Scale
Definition
is the SI unit for temperature.
Term
precision
Definition
is a measure of how closely individual measurements agree with one another.
Term
accuracy
Definition
refers to how closely individual measurements agree with the true value
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