Which is an example of a compound? And why?

Water

Iodine

Gold

Sand

Water as it is made from hydrogen and oxygen

Gold is an element so not a compound

Sand is a mixture of elements

Iodine isnt a compound

Water

Explanation:

A compound can be defined as the bonding of two or more atoms, where at least two are different types of atoms. That is, they are atoms from more than one element. Water fits this definition as it is the bonding between two hydrogen atoms and one oxygen atom, with chemical formula H2O. Iodine and gold are elements and therefore are only single atoms. Sand is classified as a mixture and therefore is not the correct option.