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Terms in this set (53)
Water can be made to boil ABOVE its normal boiling point of 100*C by-
Increasing air pressure
The freezing point and the boiling point of water can be altered by a variety of techniques. Which of the following has LITTLE or no effect on the boiling point of water?
Increasing the amount of water
Evaporation and Boiling are both
A phase change from liquid to gas
The minimum energy needed to overcome attractive forces
If the liquid molecules at the surface have enough - to overcome -, they can move into the gas phase
Molecules gaining KE to overcome attractive forces
Evaporation is a - process
Once the molecules w/ high kinetic energy escape, this lowers the avg kinetic energy of the remaining liquid molecules. When the avg KE decreases, the - does too
The molecules of a liquid in the gas phase above a liquid
The molecules of a liquid in the gas phase above a liquid exert a -
The the temp increases, the # of molecules that can evaporate -
In a closed container, the molecules will move back and forth from the from the vapor phase to liquid phase. This is called -
As temp increases, vapor pressure -
Evaporation occurs below the -
Boiling occurs when
Vapor pressure is equal to atmospheric pressure
When vapor pressure is = to atmospheric pressure, enough molecules have gained enough KE to escape attractive forces and form -
Pockets of gas throughout the liquid
Why do we say water boils at 100*C when it can boil at any temp?
The Normal Boiling Point is the temp a substance boils at under 1 atm of pressure
Shows how the phase of a substance is affected by temp and pressure
Phase change from solid to fas
Phase change from gas to solid
The temp and pressure where all three phases coexist
The liquid/gas line ends at the -
The critical point is at the
Critical temp and critical pressure
Above the -, gas can no longer be liquified, no matter what the pressure
At the critical temp, the gas can be liquified with the -
The line stops because
If the gas is above the critical temp and pressure, and is cooled down, there is no distinct phase change between gas and liquid phase
Water has strong
the theory that the behavior of substances can be explained by the motion of the molecules that make up a substance
KMT was originally developed to explain the behavior of -, until it was expanded to - & -
Liquids and Solids
The molecules of a gas are so far apart that the volume of the molecules is negligible
Assumption 1 explains why ...
Gases are transparent and have a very low density, can be compressed (bc molecules can be pushed together)
The molecules of a gas move in rapid straight line motion
Assumption 2 explains why ...
Why we can love through gases, and why gases diffuse
The molecules of a gas have no attraction or repulsion for each other
Assumption 3 explains why ...
Why a gas does not change volume if left alone.
The collisions between the molecules are perfectly elastic
An elastic collision is a -
Collision where no energy is lost
A car crash is an ...
Assumption 4 explains why ...
Why a gas does not continually cool down.
If the collisions were inelastic, the molecules would lose - and slow down. This would cause the sample of gas to - in temp
The molecules of gas have distribution of kinetic energies
At any temp the the molecules have the same -
Average kinetic energy
As temp increases, the avg KE increases and the distribution of KE becomes
Solids are molecules packed in close arrangement, explaining why solids have -, and are -. Also explains the - structure of solids.
A high density
Solid molecules have a strong attraction to each other, which explains why solids have a -
Fixed shape and volume
The molecules of a solid vibrate around a -, it also explains why we can't walk through a solid
Molecules (mc) of a liquid are closer together than a gas but father apart than a solid
Liquids are slightly -
The molecules of a liquid have slight - for each other, explaining why liquid has a -
The liquid molecules are free to move throughout the liquid. This explains why liquids
Take the shape of those container, can be poured, and we can move through liquids.
Liquids will also did use into each other
A measure of disorder
Heat of the reaction
THIS SET IS OFTEN IN FOLDERS WITH...
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Honors Chemistry Unit 2-3
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