Why do you think we use asphalt and tars/waxes (heavier, thicker, higher boiling point fraction) in our roads and roof coatings? Why not use gasoline of diesel in a roof coating or road (what would it do, what is its problem)? b) Could you burn tar as a fuel in your car? If so, what would you have to do to it to make it work?

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

i believe the answer is three water molecules

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.