Quiz on Heat and Matter

Sean ordered a cup of hot chocolate at a coffee shop. As he began to take a sip he realized that it was too hot, but he does not want to wait to drink it. What should Sean do to lower the temperature of the hot chocolate?

• add ice to remove heat

• add more hot chocolate to the cup

• remove heat by pouring it in to a bigger cup

• remove some of the hot chocolate from the cup

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Lois is making iced tea. She brings some water to a boil, adds a bag of tea leaves and sets the water aside for 5 minutes. After the time has passed, Lois removes the bag of tea leaves and adds ice to cool the liquid tea. Which of the following best describes the direction of heat flow while the tea is cooling?

• from the tea to the ice

• from the ice to the tea

• between the ice and the tea

• between the ice and tea equally

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If a sample of Mercury is a liquid at room temperature, what action would change its state of matter?

• Add heat to change it from a gas to a liquid.

• Add heat to change it from a liquid to a solid.

• Remove heat to change it from a liquid to a gas.

• Remove heat to change it from a liquid to a solid.

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The table below shows the temperatures of several objects of the same mass and material. How will the flow of thermal energy between the three objects affect the temperature?

• Thermal energy will transfer from the block to the ball until the block increases in temperature.

• Thermal energy will transfer from the block to the box until the box decreases in temperature.

• Thermal energy will transfer from the ball to the box until they come to the same temperature.

• Thermal energy will transfer from the box to the ball until they come to the same temperature.

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Taylor and her friend Alex were heating up food in a microwave and it became too hot to eat, so the plate was placed on the counter to cool. Which of the following statements accurately identifies how thermal energy was transferred?

• Thermal energy was transferred from the air to the food because air has a lower density than the food.

• Thermal energy was transferred from the food to the air because food has a higher density than the air.

• Thermal energy was transferred from the food to the air because the temperature of the air was lower than the food.

• Thermal energy was transferred from the air to the food because the temperature of the food was greater than the air.

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During a sunny day, a metal bench gets hotter than a wooden bench. Which of the following best explains this phenomenon?

• Metal reflects more sunlight than wood, making it hotter.

• Wood absorbs more heat than metal, making the metal bench feel cooler.

• Metal conducts heat better than wood, making it feel hotter in the sunlight.

• Wood conducts heat away from the surface faster than metal, making the metal bench hotter.

When salt is added to ice, the ice melts faster. Which statement best explains why this happens?

• The salt increases the freezing point of water, causing the ice to melt.

• The salt decreases the freezing point of water, causing the ice to melt.

• The salt reacts chemically with the ice, generating heat and melting the ice.

• The salt absorbs heat from the surroundings, lowering the temperature and freezing the water.

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When a glass of water is left outside on a cold day, it eventually freezes. Which statement best explains this phenomenon?

• The water loses thermal energy to its surroundings, causing it to freeze.

• The water gains thermal energy from its surroundings, causing it to freeze.

• The glass transfers cold to the water, causing it to freeze.

• The surrounding air heats up, causing the water to freeze.

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What happens to the temperature of a room when an air conditioner is turned on?

• The temperature of the room increases due to the heat generated by the air conditioner.

• The temperature of the room decreases as the air conditioner removes heat from the room.

• The temperature of the room remains the same as the air conditioner only circulates the air.

• The temperature of the room first increases then decreases as the air conditioner adjusts.

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Why does blowing on hot soup help cool it down?

• The breath adds moisture to the soup, increasing its heat capacity.

• The breath increases the temperature of the soup, causing it to cool down faster.

• The breath helps in the evaporation of the soup, which removes heat.

• The breath creates a vacuum over the soup, reducing its temperature.

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