Combustion, Heat, and Energy Practice Test

Front

What factors does thermal energy depend on?

Back

Thermal energy depends on an object's mass, phase (solid, liquid, or gas), and temperature.

Front

Is combustion necessary for gasoline-powered cars to move?

Back

True

Front

What energy transformation occurs in a battery-powered flashlight when it is turned on?

Back

Chemical energy is transformed to electrical energy, which is then transformed to light energy.

Front

Where does most of the energy we use on Earth originally come from?

Back

The sun.

Front

Which liquid has the strongest attraction between particles?

Back

Mercury has the strongest attraction between particles.

Front

Define combustion.

Back

Combustion is a chemical reaction that occurs when a substance reacts rapidly with oxygen, producing heat and light.

Front

What is thermal energy?

Back

Thermal energy is the total kinetic energy of the particles in a substance, related to its temperature.

Front

Explain the difference between endothermic and exothermic reactions.

Back

Endothermic reactions absorb heat from the surroundings, while exothermic reactions release heat.

Front

What is the role of the sun in the energy cycle on Earth?

Back

The sun provides the primary source of energy for photosynthesis, which is the foundation of the food chain.

Front

What is the principle of conservation of energy?

Back

Energy cannot be created or destroyed; it can only be transformed from one form to another.