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Chem

Terms

undefined, object
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gas
the form of matter that is an easily compressible fluid, an shape or size
significant figures
the digits in a measurement number that include all certain digits plus a final digit plus a final digit having some uncertainty
law
a concise statement or mathematical equation about a fundamental relationship
giga
10^9 G
element
a substance that cannot be decomposed by any chemical reaction into simpler substances
experiment
an observation of natural phenomena carried out in a controlled manner so that the results can be duplicated
law of definite proportion
a pure compound whatever its source always contains definite proportions of the elements by mass
deci
10^-1 d
mega
10^6 M
exact number
a number that arises when you count items or sometimes when you define a unit
substance
a kind of matter that cannot be separated into other kinds of matter by any physical process
law of conservation of matter
the total mass remains constant during a chemical change
dimensional analysis
is the method of calculation in which one carries along the units for quantities
mixture
is a material that can be separated by physical means into two or more substances
accuracy
the closeness of a single measurement to the true value
centi
10^-2 c
mass
the quantity of matter in a material
micro
10^-6 mu
precision
closeness of the set of values obtained from identical measurements of quantity
phase
is one of several different homogeneous materials present in the portion of matter under study
matter
whatever occupies space and can be perceived by our senses
unit
with a fixed standard of measurement
liquid
the form of matter that is a relatively incompressible fluid, fixed volume but no fixed shape
rounding
the procedure of dropping non sig figs in a calculation result and adjusting the last digit
physical change
a change in the form of matter but NOT in its chemical properties
solid
the form of matter characterized by rigidity, fixed shape and volume
chemical change
is a change in which one or more kinds of matter are transformed into a new kind of matter or several new kinds of matter
theory
a tested explanation of basic natural phenomena
chemical property
a characteristic of a material involving its chemical change
milli
10^-3 m
compound
is a substance composed of two or more elements chemically combined
pico
10^-12 p
homogenous mixture
a mixture that is uniform in its properties throughout given samples
hypothesis
a tentative explanation or regularity of nature
conversion factor
a factor equal to 1 that converts a quantity in one unit to a quantity expressed in another unit
heterogeneous mixture
a mixture that consists of physically distinct parts, each with different properties
nano
10^-9 n
density
mass per unit volume =mass/volume
kilo
10^3 k
physical property
a characteristic that can be observed for a material without changing it chemical identity

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