Chemical Reactions and Heat

Front

Warm air is __________ dense than cold air.

Back

less

Front

In winter, warm air __________ and __________ warming the whole house through __________.

Back

expands, rises, convection

Front

What best explains why the water in the cup is no longer cold after a short time?

Back

The heat from the air transferred to the water in the cup, making the water in the cup warmer.

Front

Why did Manuel's father suggest using hot water to loosen the lid of the jar?

Back

Metals expand when they are heated.

Front

What happens when ice cubes melt in a glass?

Back

Heat is transferred from the warmer water to the ice cubes.

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases).

Front

What is conduction?

Back

Conduction is the transfer of heat through direct contact between materials.

Front

What is the principle of thermal expansion?

Back

Most materials expand when heated and contract when cooled.

Front

What is the difference between heat and temperature?

Back

Heat is the energy transferred between objects due to a temperature difference, while temperature is a measure of the average kinetic energy of particles in a substance.

Front

What is an example of a convection current?

Back

Warm air rising and cool air sinking in a room creates a convection current.