Q) Can you explain why ?

P1 1.4 Conduction Learning objectives Describe how energy is transferred in solids by heating. Explain why some solids are conductors of heat and some are insulators. click here

Conduction in Metals Aim: Testing conduction of heat in Metals. Describe what I did. What happened? Can you draw a diagram to explain? Can you draw a table of results? Q) Which metal should pans be made from?

heat Conduction in Metals Metals are good conductors of heat Free electrons surrounds metal atoms These gain kinetic energy and go faster This makes heat transfer in metals very efficient insulators do not have the free electrons.

Conduction Click conduction in a liquid Click Even in solid matter, like hot pots and cold feet, the atoms and molecules are always doing a dance, moving up and down and all around. We can't see them move, but we can feel their energy. How? As heat! Adding heat energy to matter makes its atoms and molecules move even faster. As they speed up, they bump against their neighbors, and get them moving faster too. Put a cool pan on a hot stove, and soon the pan is hot. If the handle is metal, it will get hot too, as the faster-moving molecules in the metal pass their energy along. That's conduction: Matter "conducting" energy throughout itself, through molecules bumping into each other. Q Draw a diagram to explain this or design a dance to show how the above happens.

Solids such as___________ do not have free electrons, so they are poor conductors of heat, or good insulators. Most liquids and gases are poor conductors, because the particles can move about freely and do not pass on energy to one another easily. Insulators

Discuss and plan how the insulating properties of a material can be improved. OR Use different materials to insulate identical beakers of hot water. Control variables – amount of water, starting temperature, type of thermometer, same time period. Insulation

Animals and insulation Q) How are animals are adapted to live in cold conditions? Insulation to help reduce the transfer of energy from their bodies to surroundings. Feathers, fat and fur are good insulators.

Homework challenge…….can you do better than this?

Questions  How is energy transferred by conduction?  Why are liquids and gases poor conductors?  Explain why materials that are good electrical conductors are usually also good at conducting by heating.  Many houses have double-glazed windows. These have two sheets of glass with an air gap between them. Why does this provide better insulation than single glazing?

 First aiders will often cover someone who has been injured outdoors with a very thin blanket made of shiny metal foil. Draw a table showing the advantages and disadvantages of using foil instead of a normal blanket.  A* Look at the pan. Explain why it is made of metal and why a chef uses a cloth when picking it up. Include the role of free electrons in your answer.