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Chapter 23: Change of Phase Questions
Chapter 23: Change of Phase Questions
29
Physics
01/05/2012

Term
 During evaporation, a liquid changes phase at its ___________ and becomes a gas.
Definition
 surface
Term
 Evaporation is a ____________ process.
Definition
 cooling
Term
 During condensation, a gas changes phase and becomes a _____________.
Definition
 liquid
Term
 Condensation is a ____________ process.
Definition
 warming
Term
 At the same relative humidity, there is more ________ ________ in warm air than in cold air.
Definition
 water vapor
Term
 ______________ and _________ form when air cools and is unable to contain as much water vapor.
Definition
 Cloudsfog
Term
 What happens to a liquid’s volume when evaporation and condensation occur at the same rate?
Definition
 No change
Term
 A liquid is in equilibrium when the surrounding air is ____________ with its vapor.
Definition
 saturated
Term
 Water evaporates much faster than it condenses in: A.) dry air B.) humid air
Definition
 dry air
Term
 A liquid can change phase at/below/at and below the surface.
Definition
 at and below, during boiling, a liquid changes phase at any place within the liquid and gas bubbles form.
Term
 ______________at a liquids surface affects its boiling temperature.
Definition
 Pressure
Term
 Boiling is a cooling _______________.
Definition
 process
Term
 During freezing, a liquid changes phase and becomes a ______________
Definition
 solid
Term
 You can ______________ the freezing temperature of a liquid by adding other substances to it.
Definition
 decrease
Term
 During phase changes energy is/is not given off.
Definition
 is
Term
 The temperature of a substance does/does not change drastically when it changes phase.
Definition
 does not
Term
 At which phase change is more energy given off: A.) water vapor → water B.) water → ice
Definition
 Much more energy is given off when water vapor condenses into water.
Term
 Name the three common phases of matter and the phase of matter in space.
Definition
 Solid, liquid, gas, plasma
Term
 A change of phase from liquid to gas that takes place at the surface of a liquid is ______.
Definition
 Evaporation
Term
 Why is evaporation and boiling considered “cooling” processes?
Definition
 The average KE of the molecules remaining is lower.
Term
 Why is “condensation,” considered a warming process?
Definition
 Kinetic energy lost by condensing gas molecules warms the surface they strike.
Term
 What does relative humidity indicate?
Definition
 How much water vapor is in the air that the air can hold at a certain temperature.
Term
 What do we mean when we say air is “saturated”?
Definition
 The air contains as much water vapor as it can at that temperature.
Term
 The changing of a gas to a liquid is called _____________________.
Definition
 condensation
Term
 When evaporation and condensation occur at the same rate the liquid is in ____________________________________
Definition
 equilibrium
Term
 The change of phase from liquid to gas that occurs beneath the surface in the liquid is called ______________________________________
Definition
 boiling
Term
 The change in phase from liquid to solid is called ______________________
Definition
 freezing
Term
 Melting of water under pressure, removing the pressure and reformation of ice is called __________________________________
Definition
 regelation
Term
 Why does it protect your finger to wet it before you put it on a hot iron?
Definition
 The energy goes into changing the phase of the liquid rather than vaporizing your finger.
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