Ninety-nine percent of all the matter that can be observed in the universe exists as
What is plasma?
100
Which of the following will cause a decrease in gas pressure in a closed container?
What is lowering the temperature?
100
The heat of fusion for water is the amount of energy needed for water to
What is melt?
100
What phase change is an exothermic phase change?
What is deposition
100
Evaporation is the process that changes a substance from a liquid to a gas at temperatures below the substance's
_______________ point.
What is boiling?
200
If you move a substance from one container to another and its volume changes, the substance is a
What is gas?
200
Boyle's law states that the volume of a gas is inversely proportional to its pressure if the
What is temperature and number of particles are constant?
200
If a solid piece of naphthalene is heated and remains at 80 degrees C until it is completely melted, you know that 80 degrees C is the
What is freezing point and melting point of naphthalene?
200
The state of matter that exists only at extremely low temperatures is call Bose-Einstein ________
What is condensate?
200
Materials can be classified as _______, ________, ______ based on whether their shapes and volumes are definite of variable.
What is solids, liquids and gases?
300
Forces of attraction limit the motion of particles most in
What is a solid?
300
At a temperature of 274K, the gas in a cylinder has a volume of 4.0 liters. If the volume of the gas is decreased to 2.0 liters, what must the temperature be for the gas pressure to remain constant?
What is 137K?
300
True or False, when ice is melting water molecules move from their fixed position.
True
300
The motion of one particle of a gas is unaffected by the motion of other particles of the gas unless the particles_____
What is collide
300
What happens to the arrangement of molecules as ice melts?
What is some molecules gain enough energy to move from their fixed position.
400
Collisions of helium atoms and the walls of a closed container cause
What is gas pressure?
400
The phase change that is the reverse of condensation is
What is vaporization?
400
The phase change in which a substance changes from a solid to a gas or vapor without changing into a liquid first is
What is sublimation?
400
The pascal is the SI unit for _________
What is pressure?
400
A gas has
What is no definite shape of definite volume?
500
Raising the temperature of a gas will increase its pressure IF the volume of the gas
What is and the number of particles are constant?
500
During a phase change, the temperature of a substance
What is does not change?
500
The phase change in which a substance changes from a gas directly to a solid is?
What is deposition?
500
During vaporization, a substance changes from a(an) _____________ to a(an) _____________
What is liquid and gas?
500
Matter that has a definite volume but no definite shape is a