Unit 9 Lesson 5 What Are Conductors and Insulators?

Eyad is going to stir some soup he is cooking in a pot. The soup is very hot. He wants to use a spoon that will keep his hand from getting too hot. Which material would be best for the spoon?

• aluminum

• wood

• steel

• copper

Which material would be best to wrap around a very hot cup to prevent getting burned?

• foam

• aluminum foil

• plastic wrap

• paper

Which material would make the best container to warm food over a campfire?

• aluminum

• wood

• rubber

• plastic

Maria's house gets very cold on winter nights. She has one thin blanket on her bed. What could she do to stay warmer?

• use another thin blanket

• use a fluffy blanket instead of the thin blanket

• use a fluffy blanket and a thin blanket

• use two fluffy blankets instead

Rachel tests how quickly different materials change temperature when they are heated. All materials start at 20 °C and are heated at the same time. The table below shows the temperatures of the materials after 10 min.

Which is the best insulator?

• Material 1

• Material 4

• Material 3

• Material 2

Abdalla is planning to take a hot sandwich to school for lunch. He wants to wrap it in something to keep it warm. Which material would best keep the sandwich warm?

• foam wrap

• aluminum foil

• waxed paper

• plastic wrap

Abdelrahman is making a poster about conductors and insulators. Which of these objects should he list as a conductor?

• 
• 
• 
• 

Rana is going outside to play on a cold winter day. What feature of her winter coat will most help her stay warm?

• It is lightweight.

• It has a single layer of cloth.

• It is thick and very fluffy.

• It is lightweight.

The pots and pans in Sarah’s kitchen are made of steel, copper, and aluminum. What is the best reason Sarah’s pots and pans are made of these materials?

• They are easy to shape.

• They have the ability to stop the flow of heat.

• They are excellent conductors of heat.

• They have low melting points.

A farmer is planning to build a barn. The walls of the barn can be either wood or metal. Which would most likely be warmer in the winter and cooler in the summer? Why?