it stays a gas
Every substance will turn into a gas if sufficiently heated, so yes, lithium can exist as a gas.
If heated sufficiently it will turn into water vapour (steam) which is the gaseous state of water. It will also melt and evaporate.
they turn into gas
Evaporation.
Yes, butter can turn into a gas, because when it is heated, the steam inside reacts with the butter, turning it into a gas
Molecules move faster when heated -- no matter what state they're in.
water vapor (gas state) can turn into water (liquid state) when cooled.
metal is a solid that expands when heated also of course when liquids are heated and change state into a gas they expand but metal is cool because it expands before it changes state
Gas evaporates when it is heated. Going from a gas to a liquid is condensation, gas skipping the liquid state and going straight to the solid state is sublimation.
When we heat ice it's state is Gas. Don't get confused that it is in liquid form.
the copper oxide will turn red
Steam is a gas. Actually, if you heat a gas, you will get the fourth state of matter-plasma. Plasma is a SUPER hot gas.