Ch 11 Lesson 3 &5 Review (Savvas 7th grade science Ohio)

Michael, Abigail, and Aiden are sitting around a campfire. The warmth they feel is due to what kind of energy?

• the energy of electrons moving through a circuit

• the energy stored due to its position

• the energy of particles in motion which can be described as heat

• the energy of moving downhill

Sophia, Avery, and David are studying for their physics exam. They are discussing the three ways that heat is transferred in thermal energy. Sophia suggests they are:

• conduction, convection, and radiation

• temperature, heat, density

During a science experiment, Lily, Henry, and William noticed that when they heated a pot of water on the stove, the hot water rose to the top and the cold water sank to the bottom. This is an example of heat transfer by convection. This happens when:

• there is a circulation of hot water rising and cold water sinking, like in their experiment

• there is space that heat travels through in waves outwardly

• two objects are touching and heat moves from one object into the next object.

Which best describes the process of convection?

• Convection is the primary way  heat travels  through rays.
• Convection is the primary way heat travels  through metals.
• Convection is the primary way heat travels  through appliances.
• Convection is the primary way heat travels  through liquids and gasses.

Tom puts a metallic cover over his car’s windshield after parking. How does this control  the sun’s rays  during a sunny day?

• It prevents heat energy from leaving the car.
• It controls the temperature by providing shade.
• It reflects the sun’s rays away from the windshield.
• It absorbs heat in the windshield  protector and  cools the car.

How is heat transferred when boiling a pot of water on the stove?

• conduction
• convection
• combustion
• radiation

Which is an example of heat being transferred by conduction?

• a furnace heating the air in a school
• an ice cube melting in a person’s hand
• a pot of water on a stove boiling
• the sun heating water in a swimming pool

Which best explains how bacon is fried on a stove burner?

• The bacon creates a convection current, the  heat rises to the pan, and then rises to the stove burner.
• The bacon transfers heat directly to the pan, and the pan transfers heat directly to  the stove burner.
• The stove burner radiates heat to the pan,  and the pan radiates heat to the bacon.
• The stove burner transfers heat directly  to the pan, and the pan directly  transfers heat to the bacon.

In heat transfer, heat always flows from the _______________ substance to the _______________ substance.

• hotter to colder

• colder to hotter

• hotter to hotter

• colder to colder

The handle of a metal spoon warms up when it is placed in a hot bowl of soup because of ________.

• convection

• conduction

• radiation