7th Grade Energy and Heat sub day

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

• The temperature always decreases.

• The temperature always increases.

• The temperature remains constant.

• The temperature may increase or remain constant depending on the state change.

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Which of the following is an example of energy transformation?

• A book resting on a table.

• A car engine converting gasoline into motion.

• A rock sitting on the ground.

• A glass of water at room temperature.

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What does the law of conservation of energy state?

• Energy can be created and destroyed.

• Energy can only be created, not destroyed.

• Energy cannot be created or destroyed, only transformed.

• Energy is always lost in transformations.

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In which direction does heat flow between two objects?

• From cooler objects to warmer objects.

• From warmer objects to cooler objects.

• Heat does not flow between objects.

• Heat flows in random directions.

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Describe what happens to the state of water when heat is removed.

• It changes from liquid to gas.

• It changes from gas to liquid.

• It changes from liquid to solid.

• It changes from solid to gas.

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Explain how a battery transforms energy.

• It transforms chemical energy into electrical energy.

• It transforms electrical energy into chemical energy.

• It transforms thermal energy into light energy.

• It transforms kinetic energy into potential energy.

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Provide an example of energy conservation in a closed system.

• A ball rolling down a hill and stopping.

• A pendulum swinging back and forth without air resistance.

• A car accelerating on a highway.

• A light bulb burning out.

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Describe how heat transfer occurs when you hold an ice cube in your hand.

• Heat flows from the ice cube to your hand.

• Heat flows from your hand to the ice cube.

• No heat transfer occurs.

• Heat flows in both directions equally.

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Predict what happens to the temperature of a gas when it is compressed.

• The temperature decreases.

• The temperature increases.

• The temperature remains constant.

• The temperature fluctuates randomly.

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Analyze the energy transformations in a hydroelectric power plant.

• Electrical energy to mechanical energy to potential energy.

• Potential energy to mechanical energy to electrical energy.

• Chemical energy to thermal energy to electrical energy.

• Thermal energy to mechanical energy to potential energy.

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