Heat Conduction

Question 1

Conduction of heat energy is the process where _____ _____ pass on their _____ _____ _____ to _____ _____

Answer 1

Conduction of heat energy is the process where VIBRATING PARTICLES pass on their EXTRA KINETIC ENERGY to NEIGHBOURING PARTICLES

Question 2

Conduction of heat energy _____ _____ the solid, and gradually some of the _____ _____ _____ (or heat) is passed _____ _____ _____ _____ the solid, causing a _____ _____ _____ at the _____ _____ of the solid.

Answer 2

Conduction of heat energy CONTINUES THROUGHOUT the solid, and gradually some of the EXTRA KINETIC ENERGY (or heat) is passed ALL THE WAY THROUGH the solid, causing a RISE IN TEMPERATURE at the OTHER SIDE of the solid.

Question 3

What does the passing of heat throughout a solid by conduction result in?

Answer 3

An increase in the heat radiating from its surface

Question 4

When is conduction usually faster? Why?

Answer 4

In DENSER solids.

The particles are CLOSER TOGETHER and so will COLLIDE MORE OFTEN and PASS ENERGY between them

Question 5

What causes a material to conduct heat more slowly?

What are they called?

Answer 5

LARGER SPACES between particles

Insulators

Question 6

What makes metals good conductors?

Answer 6

Their FREE ELECTRONS

Question 7

At the ____ ____ of a metal the electrons move ____ and ____ with ____ ____ ____ , ____ energy.

Answer 7

At the HOT END of a metal the electrons move FASTER and COLLIDE with OTHER FREE ELECTRONS, TRANSFERRING energy.

Question 8

Because the electrons in metals can ____ ____, this is obviously a ____ ____ ____ of ____ the energy through the metal than ____ ____ it between ____ ____ atoms.

Answer 8

Because the electrons in metals can MOVE FREELY, this is obviously a MUCH FASTER WAY of TRANSFERRING the energy through the metal than SLOWLY PASSING it between JOSTLING NEIGHBOUR atoms.

Question 9

Is conduction more efficient through a short, fat rod or a long, thin rod? Why?

Answer 9

A short, thin rod

Because the electrons have less far to transfer the energy

Question 10

Why do metals generally feel cooler/ hotter than other materials left in the same conditions?

Answer 10

Because they conduct heat away/ into your skin much quicker than the other material, so your skin cools down/ heats up quicker.

THE METAL IS NOT ACTUALLY COLDER/ HOTTER