Unit 6- Energy & Heat

What happens to the temperature of a substance when heat is added to it?

• The temperature decreases.

• The temperature remains the same.

• The temperature increases.

• The substance changes color.

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Which of the following best describes the flow of heat between two objects?

• Heat flows from cooler objects to warmer ones.

• Heat flows from warmer objects to cooler ones.

• Heat flows equally in both directions.

• Heat does not flow between objects.

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When ice melts into water, what type of energy transformation occurs?

• Chemical energy to thermal energy

• Thermal energy to kinetic energy

• Potential energy to thermal energy

• Thermal energy to potential energy

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Which statement best explains the law of conservation of energy?

• Energy can be created and destroyed.

• Energy can be transformed from one form to another but cannot be created or destroyed.

• Energy is always lost as heat.

• Energy is only conserved in closed systems.

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A pot of water is heated on a stove. Describe the energy transformation that occurs.

• Electrical energy to chemical energy

• Chemical energy to thermal energy

• Thermal energy to electrical energy

• Electrical energy to thermal energy

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Plan an experiment to demonstrate that heat flows from a warmer object to a cooler one.

• Place a hot metal rod in a cup of cold water and measure the temperature change.

• Place a cold metal rod in a cup of hot water and measure the temperature change.

• Place two metal rods at the same temperature in a cup of water and measure the temperature change.

• Place a hot metal rod in a cup of hot water and measure the temperature change.

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Which of the following scenarios best illustrates the conservation of energy?

• A ball thrown into the air stops at its peak height.

• A car engine converts gasoline into motion and heat.

• A light bulb burns out after being used for a long time.

• A battery loses charge over time without being used.

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What happens to the state of water when heat is removed from it?

• It turns into steam.

• It remains liquid.

• It turns into ice.

• It evaporates.

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Describe how energy is transformed when a battery-powered flashlight is turned on.

• Chemical energy to light energy

• Electrical energy to chemical energy

• Light energy to thermal energy

• Thermal energy to electrical energy

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Cite evidence to explain why a closed system does not lose energy.

• Energy is absorbed by the surroundings.

• Energy is transformed within the system but not lost.

• Energy is created within the system.

• Energy is destroyed within the system.

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