Energy Summative Retake

Match the following energy transformations to the correct object:

• T. Iron

• electrical to light and sound

• Q. burning candle

• electrical to thermal

• R. TV turned on

• chemical to light and heat

• S. Mixer making batter

• electrical to mechanical and sound

Marcos and his father are making hot chocolate over a campfire. Energy from the fire is transferred to the hot chocolate to heat it. What is the best way to find out how much energy is transferred to the hot chocolate?

• Measure the mass of the chocolate

• Measure the temperature of the chocolate

Computers can turn electrical energy into light and sound energy. Which other type of energy does a computer produce?

• chemical energy

• thermal energy

The visible glowing of the burner shows that the energy in the burner is transforming from

• electrical energy to light energy.

• light energy to electrical energy.

How do the molecules of metal and water in the pot transfer thermal energy when they are heated? Select all the TWO that apply.

• The molecules in the water transfer thermal energy through radiation.

• The molecules of metal in the pot transfer thermal energy through convection.

• The molecules of metal in the pot transfer thermal energy through conduction.

• The molecules in the water transfer thermal energy through conduction.

A student places a skillet on a stove. After heating for 10 minutes, the student removes the skillet from stove. Which describes the kinetic energy of the molecules in the skillet during the investigation? 

• The kinetic energy increases and then decreases. 

• The kinetic energy decreases and then increases. 

A cup of hot chocolate has a spoon in it. How does the heat move from the hot chocolate to the metal spoon handle?

• It moves through convection, because heat is transferred directly from the hot chocolate to the spoon.

• It moves through conduction, because heat is transferred directly from the hot chocolate to the spoon.

During the experiment, black pepper was added to the water as it boiled strongly, and the pepper moved in a circular pattern from the top of the water to the bottom and back again. What does the circular pattern of the pepper represent?

• the convection of ocean currents as warm water rises and cool water sinks

• the radiation of thermal energy being passed from the Sun into the ocean

Which best describes radiation heat transfer?

• the transfer of heat through electromagnetic waves which does not involve the movement of matter

• the transfer of heat due to circulation which is based on changing densities

Using the specific heats in the table, which TWO materials would be the best materials for their lunch bag? 

• the material with the lowest specific heat

• the material with the highest specific heat

• the cork because it takes more heat to raise its temperature

• the artificial wool because it has the highest specific heat