34 terms

Matter Test 2 Vocabulary

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Density
The amount of mass in a given volume.
phase/state
condition in which matter can be found
change in phase or state
a change in the condition of matter
heat
a form of energy that causes substances to rise in temperature or to undergo changes in state
expand
to spread out or take up more space
contract
shorten or shrink; come closer together
thermal expansion
the spreading out of molecules due to the addition of heat
condense
to make or become more close, compact or dense
evaporate
to expel moisture from as by heat
boil
to produce bubbles of vapor when heated
Boiling point
The temperature at which a substance starts to boil. Water's boiling point is 100 degress celsius.
freeze
to harden into ice or a like solid by loss of heat
sublimation
change of state in which a solid goes directly to a gas skipping the liquid state
Asolute Zero
loss of heat to the point where all molecules stop moving
Mass
The amount of "stuff" or matter in a material
Melting point
The temperature at which a substance starts to melt. Water's melting point is 0 degress celsius.
Physical change
A change in a substance's physical state. For example, color, size, shape. (changes in state)
Chemical Change
A change in the chemical structure or make-up of a substance. (burning)
Pure Substance
A substance that is made up of only its own molecules.
Solubility
The amount of solute that can be completely dissolved in a solvent at a specific temperature.
Volume
The amount of space occupied by an object.
Solute
The substance being dissolved.
Suspension
A mixture in which small particles of a substance are spread throughout a gas or liquid. If left alone, the particles will sink to the bottom.
Solvent
The substance doing the dissolving. Water is the universal solvent.
Dilute
To make a substance less concentrated by adding a liquid such as water.
solution
A type of homogeneous mixture formed when one substance dissolves in another.
Concentrated
A substance that is not dilluted.
Gravity
The attraction that objects have for each other simply because they have mass and occupy space.
Weight
The gravitational pull on an object's mass.
Colloid
A homogeneous mixture in which the particles are mixed together but not dissolved- toothpaste, suntan lotion
Homogenous
Appears to be the same throughout- the particles evenly mix together.
Heterogeneous
Does not appear to be the same throughout (different)- particles don't evenly spread out.
Granulated
in small particles
Buoyancy
The upward force that a fluid exerts on an object that is less dense than itself. Allows a boat to float on water.