Understanding Heat Conductivity Homework

Which best explains why a metal ice cream scoop works more efficiently than a plastic ice cream scoop when dipped in warm water prior to scooping the ice cream?

• The metal heats more quickly than the plastic.

• The plastic heats more quickly than the metal.

• The metal insulates against heat.

• The plastic conducts heat.

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Why are pots used for cooking made of metal?

• Metal is an excellent conductor of heat.

• Metal makes the handle look attractive.

• Metal is a poor conductor of heat.

• Metal is natural and inexpensive.

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Why is copper often used to line the bottom of cookware?

• Copper cools quickly.

• Copper is inexpensive.

• Copper is a good insulator.

• Copper is a good conductor.

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Which container used for cooking food would best conduct heat?

• a container made of foam

• a container made of glass

• a container made of metal

• a container made of plastic

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Why do asphalt streets often have cracks in them?

• because asphalt is a good conductor of heat

• because asphalt expands when heated and contracts when cooled

• because asphalt is an insulator that helps keep heat from escaping

• because asphalt contracts when heated and expands when cooled

Which best explains why food is heated in metal pans?

• The metal will melt and the food will burn.

• The metal insulates the food from the heat.

• The metal reduces the heat until the food freezes.

• The metal will heat well so the food will cook evenly.

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Which explains how most metals react to being heated?

• They become brittle.

• They contract.

• They expand.

• They break.

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Which best explains why it is a bad idea to use metal chairs for a party on a hot sunny day?

• The metal chairs melt slowly.

• The metal chairs remain cold.

• Metal chairs are very heavy.

• Metal chairs get hot quickly.

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Clarissa wants to determine the best material to make a new type of cookware. What type of material should she choose?

• A material that conducts heat evenly.

• A material that can be easily bent into shape.

• A material that does not transmit electricity.

• A material that will remain cool to the touch.

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An engineer can choose from four different materials to make a heat-resistant handle for a stirring spoon. Which material is LEAST likely to get hot when the spoon is placed in boiling water?

• Ceramic

• Wood

• Glass

• Iron

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