HEAT REVIEW

Molly notices hot sparks rising from a campfire. She knows the sparks are hot, because they are red. Which best explains the hot sparks rising?

• The sparks are rising due to radiated heat.
• The sparks are rising due to heat being conducted.
• The sparks are rising, and heat rises, proving this is convection.
• The sparks are rising to replace warm air, so the sparks are convecting heat.

Which shows an example of convection?

• 
  Jose cooks an egg in a pot of boiling water.
• 
  Clara burns her hand by touching a light bulb.
• ucy wraps herself in an electric blanket to keep warm.
• Ben holds the end of a metal rod in fire to cook hot dogs.

Which best describes the process of conduction?

• 
  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.
• It's the way the Sun transfers heat to the Earth

Which of the following is an example of radiation?

• Macaroni moving around in a pot of boiling water.
• Steam rising from a boiling pot of grits being cooked.
• 
  The sun shining through a window and warming a table.
• Burning hand when touching a hot stove. 

Ice cubes are placed in a glass of water that is at room temperature. Which statement best describes the temperature of the water after 10 minutes?

• The temperature decreases because some of the water’s heat is lost to the ice.
• The temperature decreases because some of the ice’s heat is lost to the water.
• The temperature increases because some of the coolness of the water is absorbed by the ice.
• The temperature increases because some of the coolness of the ice is absorbed by the water.

A girl is heating soup. As she stirs the soup with a metal spoon, the spoon becomes hot and burns her hand. Why does the spoon burn the girl’s hand?

• The heat from the soup is radiated through the spoon.
• The heat from the soup is conducted through the spoon.
• The warmth of the girl’s hand is radiated into the spoon.
• The warmth of the girl’s hand is conducted into the spoon.

Which is the best example of convection?

• a camp fire
• a light bulb
• a hot air balloon
• a microwave oven

On a hot summer day, a student dropped an ice cube onto a park bench. Within minutes, the ice cube melted. Which bestdescribes the process the student observed?

• radiation
• combustion
• conduction
• convection

Which would most likely turn gas into a liquid?

• cooling
• boiling
• warming
• freezing

On a hot day in the sun, why does Robert use a foam can holder to keep his drink cool?

• 
  Foam insulates the cold drink.
• 
  Foam reflects cold air from the can.
• Foam reflects heat from the sun off the can.
• Foam conducts heat between the can and the air.