P2 Energy Transfer by Heating

The scientific name for heat energy

• conduction

• terminal

• thermal

• convection

Answer explanation

The scientific name for heat energy is 'thermal'. This term specifically refers to energy related to the temperature of an object, distinguishing it from other forms of energy like conduction and convection.

How heat travels through a solid

• conduction

• convection

• radiation

Answer explanation

Heat travels through a solid primarily by conduction, which is the process of heat transfer through direct contact of particles. In contrast, convection and radiation are not applicable to solids.

how heat travels through a liquid

• conduction

• convection

• radiation

Answer explanation

Heat travels through a liquid primarily by convection, which involves the movement of fluid particles. As the liquid heats up, it becomes less dense and rises, while cooler, denser liquid sinks, creating a circulation pattern that transfers heat.

How heat travels through space (a vacuum)

• conduction

• convection

• radiation

Answer explanation

Heat travels through space via radiation, which involves the transfer of energy through electromagnetic waves. Unlike conduction and convection, radiation does not require a medium, making it the only method for heat transfer in a vacuum.

Fluids are....

• slippy

• liquid

• gas

• solid

Answer explanation

Fluids are substances that can flow and take the shape of their container. They include liquids, like water, and gases, like air. Solids do not flow, making 'liquid' and 'gas' the correct answers.

A higher thermal conductivity means what?

• conduct heat

• conduct heat better

• conduct heat less

• does not conduct heat

Answer explanation

A higher thermal conductivity indicates that a material can conduct heat more effectively. Therefore, the correct choice is 'conduct heat better', as it signifies improved heat transfer capabilities.

What do you call an image that shows the heat leaving objects?

• thermagran

• thermo man

• thermagram

• thermometer

Answer explanation

An image that shows the heat leaving objects is called a thermagram. This term specifically refers to thermal imaging, which captures the infrared radiation emitted by objects, visualizing their heat signatures.

What gives metals their ability to conduct thermal energy so well?

• delocalised protons

• free electrons

• expensive electrons

• delocalised electrons

Answer explanation

Metals conduct thermal energy well due to free and delocalised electrons. These electrons can move easily throughout the metal lattice, transferring energy efficiently, which is why they are excellent conductors of heat.

The amount of energy needed to change the temperature of 1kg of a material by 1 degree celsius is...?

• specific heat capacity

• specific heat

• heat capacity

• a lot!

Answer explanation

The amount of energy required to change the temperature of 1kg of a material by 1 degree Celsius is known as specific heat capacity. This term specifically defines the energy needed per unit mass for a temperature change.

two examples of home insulation are...

• loft insulation

• painting the door

• a dog

• double glazing

• a cat

Answer explanation

Loft insulation and double glazing are both effective methods for reducing heat loss in homes. Loft insulation helps retain heat in the attic, while double glazing reduces heat transfer through windows.