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Science Midterms
For Midterms
61
Science
9th Grade
01/17/2010

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Term
Science
Definition
a system of knowledge and the methods you use to find that knowledge
Term
technology
Definition
use of knowledge to solve practical problems
Term
Branches of Natural Science
Definition
Physics
Chemistry
geology
astromomy
botany
zoololgy
Term
Scientific Method
Definition
An organized plan for gathering, organizing, and communicating information
Term
observation
Definition
information that you obtain through your senses
Term
hypothesis
Definition
a proposed answer to a question
Term
Scientific THeory
Definition
a well tested explanation for a set of observations
Term
Scientific Law
Definition
A statement that summarizes a pattern found in nature
Term
model
Definition
representation of an object or event
Term
manipulated variable
Definition
a variable that causes a change in another
Term
responding variable
Definition
a variable that changes in response to the manipulated variable
Term
controlled experiment
Definition
an experiment in which only one variable is deliberatley changed at a time
Term
Scientific
Definition
Term
Scientific Notation
Definition
a way of expressing a value as the product of a number between 1 and 10 and a power of 10
Term
giga
Definition
G
billion (10^9) 1000000000
Term
mega
Definition
M
million (10^6) 1000000
Term
kilo
Definition
k
Thousand (10^3) 1000
Term
deci
Definition
d
tenth (10^-1) 0.1
Term
centi
Definition
c
hundreth (10^-2) 0.01
Term
milli
Definition
m
thousandth (10^-3) 0.001
Term
micro
Definition
millionth
(10^-6) 0.000001
Term
nano
Definition
n
billionth (10^-9) 0.000000001
Term
formula for density
Definition
mass
____
Volume
Term
thermometer
Definition
an instrument that measures temperature
Term
Kelvin
Definition
Term
Kelvin conversion
Definition
K= °C+273
Term
slope
Definition
rise
____
run
Term
element
Definition
a substance that cannot be broken down into simpler sunbstances
Term
atom
Definition
smallest particle of an element
Term
compound
Definition
a substance that is made from 2 or more simpler sunstances and can be broken down into simpler substances
Term
heterogenous
Definition
parts of a mixture that are noticeably different from another
Term
homogenous mixture
Definition
a mixture where you cant see the difference between the 2 substances
Term
Suspension
Definition
a heterogenous mixture that spereates into layers over time
Term
Colloid
Definition
contains some particles that are immediate in size between the particles in a solution and the larger the particles in a suspension
Term
pyshical property
Definition
any characteristic of a material that can be observed or measured without changin the composition of the substances in the material
Term
Viscosity
Definition
the tendency of a liquid to keep it from flowing
Term
Conductivity
Definition
A material's ability to allow heat to flow
Term
Malleability
Definition
the ability of a solid to be hammered without shattering
Term
Melting Point
Definition
The temperature at which a substance changes from a solid to a liquid
Term
Boiling Point
Definition
The temperature at which a substance boils
Term
Chemical Property
Definition
any ability to produce a change in the compostition of matter
Term
Flammability
Definition
a material's ability to burn in the presence of oxygen
Term
Reactivity
Definition
The property that describes how readily a substance combines chemically with other substances
Term
Chemical Change
Definition
occurs when a substance racts and forms one or more new substances
Term
solid
Definition
a state of matter in which materials have a definite shape and a definite volume
Term
liquid
Definition
state of matter in which a material has a definite volume but not a definite shape
Term
gas
Definition
state of matter in which a material has neither a definite shape nor a deifnite volume
Term
kinetic energy
Definition
is the energy an object has due to its motion
Term
pressure
Definition
the result of a force distributed over an area
Term
absolute zero
Definition
temperature at 0°K
Term
Charles Law
Definition
v1 over t1 = v2 over t2
Term
Boyles Law
Definition
p1 times v1 = p2 times v2
Term
combined gas law
Definition
p1 times v1 over t1 = p2 times v2 over t2
Term
phase change
Definition
the reversible physical change that occurs when a substance changes from one state of matter to another
Term
endothermic
Definition
the substance absorbs energy from its suroundings
Term
exothermic
Definition
when the system releases energy to its surroundings
Term
vaporization
Definition
phase change in which a substance changes from a liquid to a gas
Term
evaporation
Definition
the process in which a sibstance changes from a liquid to a gas
Term
sublimation
Definition
the phase change in which a substance changes from a solid to a gas
Term
condenstation
Definition
the phase change in which a substance changes from a gas to a liquid
Term
Deposition
Definition
When a gas changes directly into a solid without changing to a liquid
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