It should be <em>Ultraviolet rays </em>because they are moderate in energy.
so basically
some fuels have an impurity in them which is sulfur.
When the fuel undergoes combustion, the sulfur reacts with oxygen in the air to form sulfur dioxide.
the sulfur dioxide reacts with water vapour in the air to form sulfurous acid, which is a type of acid rain.
Also
the high pressures inside a car engine may cause nitrogen and oxygen in the air to react and form oxides of nitrogen. the most common compounds formed inside car engines are NO (nitrogen oxide) and NO2 (nitrogen dioxide)
Due to prescence of any impurity, there will be change in physical properties of any liquid.
When I was on the phone with my bio teacher I asked she said endothermic
Maybe sodium? becasue its an element and I would like some points... sorryy:((((
