Terms in this set (20)
what is air?
a mixture of gasess
can gases be compressed/
yes! this can happen if you exert pressure on them
unlike liquids and solids what do gases do?
occupy the volume thats available
air behaves like a single gas T.F elaborate.
TRUE! si cgemists observed that all gases have similar physical behavior
ex. 1 mole of HE, O, at 0 degrees occupies the volume of 22.4 l
what are most gases made up of?
molecules-two or more atoms which are bonded together
which atoms exist as single atoms?
the noble gases because they dont bond with any other atoms
the number of atoms in a representative gas particle affectS the physical behavior of the gas T.F
false, it does not affect
What are the 6 postulates of gases?
1. gases have mass
2. its easy to compress gases
3. gases fill their containers completely
4.different gases can move through each other quite rapidly
5. gases exert pressure
6. the pressure of a gas depends on its temperature
the density of a gas is less than the density of a liquid or a solid t.f
what happens if you squeeze a gas?
its volume will decrease
the movement of one substance through another
the higher the temperature of a gas the ___ the pressure
what are gas properties explained by?
explained by a kinetic molecular model that describes the behavior of tiny particles that make up a gas
what are the postulates of the kinetic molecular theoryy
-that a gas consists of small particles that have mass
-particles in a gas must be separated from each other by large distances( this explains why gases can be easily compressed) the volume of these particles is 0
-particles of a gas must be in constant rapid motion (explains why gases fill their containers so quickly)
-gases exert pressure because their particles collide with the walls which they are held in
-the avg kinetic energy of gas particles depends on the temperature of the gas. gas particles have higher kinetic energy at a higher temperature
-collisions of gas particles with each other or the walls of the container are perfectly elastic
gas particles exert no force on one other. their attractive forces are so weak
Why are gas particles perfectly elastic?
because they collide with each other and the container walls without slowing down. no energy or motion is lost
how do collisions account for gas pressure?
as the gas particles collide with the walls of the container then the impact exerts a force on the wall, this ersults in pressure.
why does gas pressure increase when temperature increases?
because the gas particles speed up as the temperature increases
energy of motion
Why do you think a gas exerts a greater pressure when its particles are moving faster?
bcause the force which particles impact the walls is proportional to their velocity. higher volicity collisions tend to be more forceful.
what do gases not have>
dont have a definite shape or volume and they have a low density
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