Molecule Movement
Molecules are always _________.
Vibrating
In motion
Solid, liquid and gas
What is the definition of heat?
List one of the three types of energy transfer
Conduction, convection, raditaion
Name one of the 4 phase changes
Melting
Freezing
Evaporation
Condensation
The more thermal energy that is added, the ____ the molecules move
Faster
Adding or removing this can cause a state change
Thermal energy
If a substance has a higher amount of thermal energy, the temperature will also be _____.
Higher
When heat moves from one place to another through touch, this is called:
Conduction
Adding thermal energy can cause a solid to____
melt
Removing thermal energy causes molecules to vibrate ______
Slower
This state has a definite shape and a definite volume
Solid
This type of material will allow heat to transfer easily
Conductor
This type of energy transfer occurs in liquids caused by the movement of molecules, and also in the atmosphere.
Convection
Name one example of evaporation
Liquid to a gas
Boiling water
Water cycle
_____ is a good indicator of thermal energy.
Temperature
When you go from a liquid to a solid, thermal energy is
Removed
If you are designing a pot to cook with, what type of material would you use for the handle and why?
An insulator, such as rubber or glass, so that thermal energy is not easily transferred
Why do hot/warm molecules rise?
Density. Hot air/water is less dense, so it rises. Cool/cold air/water sinks because it is more dense
How are melting and evaporation alike?
They both require thermal energy to be added
Molecules in a gas have the most thermal energy and are moving the fastest.
Compare and contrast the molecule movement in a liquid versus the movement of molecules in a gas
Compare: they both have quicker motion of particles than a solid
Contrast: the molecules in a gas cannot be confined to a space and do not have a specific volume
How could you correct the sentence: We add heat to a substance to warm it up.
We really add thermal energy. Heat is the transfer of thermal energy
Which type of energy transfer is most important for sustaining life on Earth, and why?
Radiation. This is the only type of heat transfer that moves heat through space
Thermal energy is removed in both cases