Which indicates that a chemical reaction has occurred?

a broken egg stinks after it has been sitting out for several days

you smell gasoline when you remove the cap on a gas tank

an unripe orange on a tree doesn't smell at all
A B or C? @dtan5457

Question

Which indicates that a chemical reaction has occurred? 



a broken egg stinks after it has been sitting out for several days 



you smell gasoline when you remove the cap on a gas tank 



an unripe orange on a tree doesn't smell at all 
A B or C? @dtan5457

dtan5457 · Answer

A broken egg, because not only of it's smell, but the fact that it smells after serveral days, show a unreversible reaction