There is no transfer of energy in the reaction.
You spelled calendar incorrectly, the correct spelling is the one I previously wrote...Calendar
An element is a substance that can’t be broken down into simpler substances by chemical means, a compound is when two or more elements are combined chemically to form something new, and a mixture is when two or more substances are combined but not chemically.
I think it is B) 18 but you'd have to check. Help?