5th Class: Heat

What stone can steel be struck against to create sparks?

• Granite

• Flint

• Limestone

What type of gas can be used in a gas barbeque?

• Propane

• Hydrogen

• Methane

Which of these is NOT a fossil fuel?

• Coal

• Gas

• Wood

Too much of which gas causes global warning?

• Nitrogen

• Hydrogen

• Carbon dioxide

Materials can exist in how many states?

• One

• Two

• Three

When most solids are heated they...

• expand

• contract

• explode

When heat travels through a solid, this is called...

• expansion

• conduction

• radiation

Which of these materials best conducts heat?

• Plastic

• Wood

• Metal

Outer space is...

• hot

• cold

• warm

The heated air above a lit barbeque is an example of...

• convection

• radiation

• conduction