Phase Change 1
solid to liquid
Melting
liquid to solid
Freezing
gas to liquid
Condensation
liquid to gas
evaporation
What is it called when a molecules freedom of movement changes levels
Phase change
What are the 3 phases?
Solid, liquid and gas
Solid
When molecules are moving away from each other, which phase are they in?
Gas
When the temperature decreases the kinetic energy
decreases/gets colder
The energy that an object has because it is moving
Kinetic Energy
a pull between two molecules that is always the same for a substance
Molecular attraction
How do molecules move when they are in liquid form?
They move around each other
When molecules are in the solid phase, how are they moving?
They move in place
A different form or state of the same substance/object
Phase
Which phase(s) have molecules that move?
ALL of them (solids, liquids, and gases)
When an ice cube melts, is energy being transferred into or out of the ice?
Heat from the drink is transferred into the ice cube
When the temperature increases the kinetic energy.....
Increases/gets hotter
How does a puddle go away after the sun comes out?
(Is energy transferred into or out of the puddle? What is the phase change that happens?)
Energy is transferred into the puddle
The puddle evaporates (liquid to gas).
All changes observed on the macroscale can be explained by a change in the...
In which state of matter do particles have the most freedom of movement?
Gas
If the freedom of movement is high, then the molecular attraction is...
The same, because molecular attraction never changes
A scientist has a liquid at room temperature. He accidentally transfers energy into the liquid, but it does not change phase.
Did the movement of the molecules change?
Yes, their speed increased.
A scientist has a liquid at room temperature with a strong molecular attraction, and she wants to change it's phase. Would it be easier to turn the substance into a solid or a gas?
Solid
Water evaporates at 100°C, but oxygen evaporates at -183°C.
Which substance has a stronger molecular attraction?
Scientists have 2 substances. Both substances are at room temperature. After transferring energy into both of the substances, "Substance 1" changed phase, but "Substance 2" did not.
Which substance has a weaker molecular attraction?
Substance 1