# Change of State

Define and give examples of thermal energy & kinetic energy.

-Thermal energy is the internal energy of an object due to the kinetic energy of its molecules.
-The molecules of a hotter object have greater kinetic energy than those of a colder one.
Thermal energy in a burning flame
-Kinetic energy in a baseball that

Describe expansion and contraction of matter as a result of changes in Thermal Energy and resulting Kinetic energy.

As the Thermal Energy and resulting Kinetic energy decrease, the matter contracts, and when it increases, the matter expands.

How do molecules move and how spacing changes when they gain or lose thermal energy.

They become farther apart when they lose thermal energy and they get closer when they gain thermal energy.

What are three the main states of matter including molecular movement, shape & volume, amount of space between molecules and examples of each state

Solid-
Molecular movement: Limited, vibrates in place
Shape and Volume: Most compact, stay in one shape
Space between molecules: packed close together
Example: ice
Liquid-
Molecular movement: Can move past each other
Shape and Volume: Decently spaced apar

Explain the terms related to changing states of matter: melting, vaporization (evaporation & boiling), condensation, freezing, sublimation, deposition (provide examples of each and explain what happens with spacing of molecules and amount of kinetic energ

Melting- Ice to water. Spacing increases and KE increases.
Vaporization- water to water vapor. Spacing increases and KE increases
Condensation- water vapor to water. Spacing decreases and KE decreases.
Freezing- water to ice. Spacing decreases and KE decr

Define density and explain the relationship between density of matter and changes in kinetic energy.

The degree of compactness of a substance. As the kinetic energy increases, the density decreases, when the kinetic energy decreases, the density increases.

Explain what happens with the temperature of matter as it changes from one state to another.

It will either increase or it will decrease.

Define cohesion.

The sticking together of particles of the same substance.

Explain how cohesion changes as kinetic energy increases.

Cohesion increases as kinetic energy increases.

What is the tool used to measure kinetic energy?

Thermometer

Explain how air pressure changes with changes in thermal energy.

The more thermal energy, the more air pressure, the less thermal energy, the less air pressure.

Explain what can be done to limit thermal energy transfer.

Put a non-conductive material between the objects that the transfer would occur between.