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Mid-Term exam vocabulary
9th grade mid term
41
Science
9th Grade
10/09/2007

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Term
control
Definition
the standard to which test results can be compared
Term
data
Definition
analyzed information from and experiment or investgation
Term
experiment
Definition
common way to test a hypothesis
Term
hypothesis
Definition
educated guess based on knowledge and observation
Term
conclusion
Definition
a statement basedon your data and oberservations that proves your hypothesis correct or incorrect
Term
matter
Definition
anything that takes up space
Term
kinetic theory of matter
Definition
explantation of how particles of matter behave
Term
thermal expansion
Definition
an increase in the size of a substance when the temp. is increased
Term
Archoimedes' principle
Definition
the buoyant force of an object is equal to the weight of the fluid displaced by the object; if an object has a higher densty than a substance it will sink
Term
Bernoulli's priniple
Definition
states that as the speed of a moving fluid (liquid or gas) increases, the pressure within the fluid decreases.
Term
Charles law
Definition
the volume of a gas increaces with increasing temperature, as long as pressure doesn't change
Term
Boyles law
Definition
if you decrease the volume of a container of gas and hold the temp. constant the pressure of the gas will increase
Term
pure substance
Definition
element or compund
Term
element
Definition
all atoms alike in a substance
Term
compund
Definition
a substance in which the atoms of 2 or more elements are combined in a fixed proportion
Term
heterogenous mixture
Definition
materials can be seen easily
Term
homogenous mixture
Definition
has 2 or more gas, liquid,or solid substances blended good
Term
solution
Definition
homogenou mixture that contain very samll particles, that never settle to the bottom of a container
Term
colliod
Definition
type of mixture that never settles
Term
chemical change
Definition
a change of one substance to another
Term
physical change
Definition
a change in size,shape,or state of matter
Term
Law of conservation of mass
Definition
no matter is created or destroyed:when a log goes to ashes
Term
proton
Definition
part of the atom that has a charge of +1
Term
neutron
Definition
part of the atom that has no electric charge
Term
elecron
Definition
part of the atom that has a charge of -1
Term
chemical formula
Definition
tells what elements a compund contains and the exact numbers of the atom of each element in a unit of that compund
Term
oxidation number
Definition
how many electrons an atom has gained lost or shared to become stable
Term
metalliod
Definition
they form ionic nd covalent bonds with other elements: B Si Ge As Sb Te Po At
Term
malleable
Definition
hammered or rolled into sheets: metals would be this
Term
organic compund
Definition
most compunds containing the element carbon
Term
solute
Definition
substance being dissolved
Term
solvent
Definition
substances dissolving a solute
Term
reactants
Definition
substance that reacts
Term
products
Definition
substance being produced
Term
chemical reacions
Definition
a change in 1 or more substance are converted into new substances
Term
coefficent
Definition
# that represents the # of units of each part taking place in the substance
Term
synthesis reaction
Definition
2 or more subsances combine to form another substance A + B > AB
Term
decomposition reaction
Definition
one or more substance breaks down or decomposes into 2 or more substances
Term
single deplacement reaction
Definition
when one element replaces another element in a compund
A+BC > AC+B
Term
double deplacement
Definition
the positive ions of 1 compund replaces the positive ion of otherto form 2 new compunds
AB+CD > AD+CB
Term
indicators
Definition
an organic compund that changes color in acid or base
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