Unit 7- Heat Energy

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 is an example of heat flowing from a warmer object to a cooler one?

• Ice melting in a glass of water.

• A hot cup of coffee cooling down on a table.

• A refrigerator cooling food.

• A heater warming a room.

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Explain why adding heat to a solid might cause it to change state.

• Heat causes the molecules to slow down and stick together.

• Heat increases the energy of the molecules, causing them to move apart.

• Heat decreases the energy of the molecules, causing them to move closer.

• Heat changes the color of the solid.

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Describe the process of heat transfer when a metal spoon is placed in a hot cup of tea.

• Heat flows from the spoon to the tea.

• Heat flows from the tea to the spoon.

• Heat flows from the spoon to the air.

• Heat does not flow.

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A student observes that a block of ice melts faster when placed in warm water than in cold water. What reasoning can explain this observation?

• Warm water has more heat energy to transfer to the ice.

• Cold water absorbs heat from the ice.

• Ice melts at the same rate in both warm and cold water.

• The ice absorbs cold from the cold water.

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Predict what will happen to the temperature of a liquid if heat is continuously removed from it.

• The temperature will increase.

• The temperature will decrease.

• The temperature will remain constant.

• The liquid will evaporate.

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Which of the following best describes the direction of heat flow between two objects at different temperatures?

• Heat flows from the cooler object to the warmer object.

• Heat flows from the warmer object to the cooler object.

• Heat flows equally in both directions.

• Heat does not flow between objects.

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A pot of water is heated on a stove. Explain the changes that occur in the water as it absorbs heat.

• The water molecules slow down and form a solid.

• The water molecules move faster and may change to a gas.

• The water molecules stop moving.

• The water molecules change color.

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A student places a cold metal rod in a hot water bath. Predict the final temperature of the rod and the water.

• The rod will become hotter than the water.

• The water will become colder than the rod.

• Both will reach the same temperature.

• The rod will remain cold.

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What is the primary reason that heat flows from a hot object to a cold object?

• Because cold objects attract heat.

• Because heat naturally moves from high to low temperature areas.

• Because hot objects repel heat.

• Because cold objects repel heat.

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