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Midterm Vocab
Ms. George OCSA midterm vocab 2014
65
Physics
8th Grade
01/19/2014

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Term
observing
Definition
using your senses to gather information
Term
inferring
Definition
using prior knowledge to explain something
Term
predicting
Definition
forecasting the future based on past experience
Term
hypothesis
Definition
a testable explanation of data
Term
manipulated variable
Definition
the factor that a scientist controls in an experiment
Term
responding variable
Definition
what is affected by the manipulated variable
Term
controlled variable
Definition
other factors that must be kept the same in an experiment to make sure only the manipulated variable affects the responding variable
Term
scientific theory
Definition
well-tested EXPLANATION for a wide range of data
Term
scientific law
Definition
what scientists expect to happen every time under certain conditions (law of nature)
Term
mass
Definition
the amount of matter in an object (grams)
Term
volume
Definition
the amount of space an object takes up (m3)
Term
density
Definition
mass/volume (g/cm3)
Term
temperature
Definition
energy of particles in a substance, or how hot it is
Term
SI
Definition
international system of units, used by scientists all over the world, also known as metric system
Term
quantitative observation
Definition
an observation involving numbers
Term
qualitative observation
Definition
an observation involving neither numbers nor measurements
Term
matter
Definition
anything that has mass and takes up space
Term
atom
Definition
basic particle that makes up everything
Term
element
Definition
pure substance, cannot be broken down into other substances
Term
compound
Definition
pure substance of two or more elements chemically combined in a set ratio
Term
mixture
Definition
two or more substances in the same place but not chemically bonded
Term
homogeneous mixture
Definition
cannot see different parts, well mixed
Term
heterogenous mixture
Definition
can see different parts
Term
chemical formula
Definition
combo of symbols that shows the elements in a compound
Term
chemical equation
Definition
shorthand way to show a chemical reaction using symbols
Term
physical property
Definition
can be observed without changing into another substance
Term
chemical property
Definition
ability to react with other substances to make new substances
Term
physical change
Definition
alters appearance, not chemical makeup
Term
chemical change
Definition
produces new substance(s)
Term
law of conservation of matter
Definition
atoms aren't created or destroyed during any chemical or physical change
Term
endothermic change
Definition
takes in energy
Term
exothermic change
Definition
releases energy
Term
solid
Definition
a state of matter where particles are closely packed and vibrate in place, definite shape and volume
Term
liquid
Definition
a state of matter where particles are packed but not closely and slide past each other, definite volume
Term
gas
Definition
a state of matter where particles move freely and collide with each other
Term
plasma
Definition
the most abundant state of matter where charged ions move freely
Term
surface tension
Definition
result of an inward pull in liquid molecules that creates a "skin" on the liquid's surface
Term
viscosity
Definition
a liquid's resistance to flowing
Term
melting
Definition
change in state from solid to liquid, endothermic
Term
freezing
Definition
change in state from liquid to solid, exothermic
Term
condensation
Definition
change in state from gas to liquid, exothermic
Term
vaporization
Definition
change in state from liquid to gas, endothermic
Term
boiling
Definition
vaporization takes place throughout a liquid
Term
evaporation
Definition
vaporization takes place at the surface of a liquid
Term
sublimation
Definition
change in state from solid to gas, endothermic
Term
directly proportional
Definition
variables have a graph going through the origin in a straight line and one increases as the other increases
Term
inversely proportional
Definition
variables whose product is constant, one increases as the other decreases
Term
pressure
Definition
force exerted on a surface/area of surface
Term
proton
Definition
part of an atom that is positively charged and is located in nucleus
Term
electron
Definition
part of an atom that is negatively charged and determines what the atom reacts with
Term
neutron
Definition
part of an atom that has no charge and holds the nucleus together by separating protons, determines isotope
Term
nucleus
Definition
most of the mass in the atom is located here
Term
valence electron
Definition
electrons on the outer energy level, number determines what the atom will react with
Term
atomic number
Definition
how many protons in an atom
Term
atomic mass
Definition
average mass of nucleus of all isotopes of an element
Term
mass number
Definition
sum of protons and neutrons in an atoms
Term
isotope
Definition
atoms with same number of protons but different numbers of neutrons
Term
radioactive
Definition
describes an atom whose nucleus spits out particles
Term
metal
Definition
element on left side of periodic table, react by losing electrons, properties:shiny, good conductor, mostly solids
Term
nonmetal
Definition
element on right side of periodic table, react by gaining electrons, brittle, bad conductors
Term
semimetal
Definition
element on zigzag, react by sharing electrons, shares properties of metals and nonmetals
Term
covalent bond
Definition
between two semimetals sharing electrons
Term
ionic bond
Definition
between a metal and a nonmetal metal loses electrons, nonmetal gains electrons
Term
reactant
Definition
substance that enters into a chemical reaction
Term
product
Definition
substance created by a chemical reaction
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