Matter and Heat Transfer Review

Jake is wearing gloves while he gets a hot pan out of the oven. Which best explains why Jake needs to wear gloves while he is carrying the hot pan?  (1)

• The gloves protect his hands from convection heat in the hot pan.
• The gloves protect his hands from heat that is radiated through the hot pan.
• The gloves protect his hands from heat that is conducted through the hot pan.
• The gloves protect his hands from heat that enters the pan from the surrounding air.

Eric noticed that when he put ice in his glass of water, the ice floated. Which best explains why this happens? (4)

• When water freezes it contracts, making the ice lighter than the water.
• When water freezes the particles break down, making the ice lighter than water.
• When the water freezes, it turns into a solid, and all solids are lighter than liquids.
• When water freezes it expands making it lighter for the space it takes up.

James measured the temperature outside his house everyday for 2 months. He observed that on days the sky was mostly cloudy, the temperature was an average of 9 degrees cooler than days the sky was mostly sunny. Which best describes the reason for this pattern? (5)

• The clouds blocked radiation from the sun, causing cooler temperatures.
• The clouds blocked conduction from the sun, causing cooler temperatures.
• The clouds allowed more radiation from the sun to reach the Earth’s surface.
• The clouds allowed more conduction from the sun to reach the Earth’s surface.

Ceramic materials do not melt easily. Which best describes a practical use for ceramics that takes advantage of this characteristic? (7)

• an ice cube tray
• a statue in a garden
• pottery in a museum
• tiles on the outside of a space shuttle

A scientist trying to identify an unknown liquid may heat the liquid. Which would be the best reason for the scientist to heat the liquid? (8)

• to observe a color change
• to get rid of most impurities
• to identify the boiling point
• to collect gases for additional study

A student is trying to open a jar with a metal lid. The lid of the jar is very tight, and the student is not able to open it. The student puts the jar and lid under hot water, and then attempts to open it. The lid easily opens. Which best explains why the lid was easy to open after putting it under hot water? (10)

• The hot water melted the glue that was holding the lid shut, making it easier to open.
• The hot water expanded the metal lid of the jar, making it easier to open.
• The hot water caused the jar to contract, making the lid easier to open.
• The hot water made it easier for the student to get a grip on the jar, so it was easier to open.

Which best describes the process of conduction? (14)

• When two objects touch, the heat is transferred into the air.
• When two objects touch, the heat from the hotter object is transferred to the cooler object.
• When two objects touch, the cool air from the cooler object is transferred to the hotter object.

A student places a cup of cold water on a counter in a hot room. After a short time, the student notices that the water in the cup is no longer cold. Which best explains why the water in the cup is no longer cold? (16)

• The coldness of the water transferred to the air, making the water in the cup warmer.
• The coldness of the water was conducted to the cup, making the water in the cup warmer.
• The heat from the air transferred to the water in the cup, making the water in the cup warmer.
• The heat from the air caused the cold water in the cup to condense, making the water warmer.

 A pot of water is placed on a stove. The water begins to boil rapidly. Which explains why the water is boiling faster? (19)

• The cooler water is rising in the pot to replace the warmer water on top through the process of radiation.
• The warm water is rising in the pot to replace the cooler water on top through the process of radiation.
• The warm water is rising in the pot to replace the cooler water on top through the process of convection.
• The cooler water is rising in the pot to replace the warmer water on top through the process of convection.

 Which process of the water cycle would be most affected by a lack of sunlight? (35)

• condensation
• precipitation
• evaporation
• runoff