Phase Changes Flashcards
Adding heat energy to a solid causes _____________. Adding heat energy to a liquid causes _______________.
Melting, boiling (or vaporization)
Removing heat energy from a gas to form a liquid is called ____________. Removing heat energy from a liquid to a solid is called _______________.
Condensation, freezing
The water droplets on the outside of a cold drinking glass are caused by…
Condensation of the water vapor in the air- the cold glass removes heat from the vapor causing condensation.
The plateau that is seen on a phase change graph shows that what happens during a phase change?
The temperature of the substance does not increase during a phase change. It stays the same until all of the substance has gone through the phase change.
The melting point is the same as the _____________point.
Freezing
The boiling point is the same as the ______________ point.
Condensation
For what phase changes do molecules gain heat energy, move faster, and spread farther apart?
Melting and boiling (vaporization)
In what phase changes do molecules lose heat energy, move slower, and move closer together?
Condensation and freezing
Vapor changes to liquid-what phase chage?
Condensation
Solid to liquid
Melting
Liquid to solid
Freezing
On a cold day you can see your breath. What phase change causes this to happen?
Condensation- the water vapor in your breath loses heat energy when it gets cold, so it condenses into liquid water droplets in the air.
Liquid to gas
Boiling/vaporization/evaporaton
If a substance’s melting point is above room temperature, then the substance will be in the ____________ phase.
Solid
3 phases of matter
Solid, liquid, and gas
