Changes of State
Solidification
What is a source of thermal energy?
Chemical energy or electrical energy
Define solar energy.
Energy from the sun
Liquid to gas is known as?
Evaporation
What is a source of chemical energy?
Wood or coal
What are other sources that are used for thermal energy? (Name 2)
1. Your body
2. Natural gas
3. Oil
4. Composer
What is it called when a solid turns into a liquid?
Melting or fusion
What are 3 downside of hydro electric dams?
1. The river no longer flows naturally
2. Wildlife in the area is usually effected
3. Fishing and hunting areas are also effected
Wind energy is?
The energy of moving air
List all the changes of state.
Condensation
Evaporation
Melting(fusion)
Freezing(solidification)
Sublimation
What is a hydro electric dam?
Hydro electric dams, are like waterfalls, change the energy of falling water to electrical energy
Name 1 time solar energy can't be used directly.
1. During the night
2. Less solar energy is available in winter than summer
3. When the sun doesn't shine
What is sublimation?
When solids turn into gases and vice versa
How does burning fuel converts chemical energy to thermal energy?
1. The thermal energy boils water
2. The steam from the boiling water spins the turbines
3. Mechanical energy from the spinning turbine turns a generator
4. The generator converts mechanical energy to electricity
What is passive solar heating?
Uses materials in the structure to absorb, store and release solar energy