Classify each of the following substances as an element or a compound: (a) hydrogen, (b) water, (c) gold, (d) sugar.

a) element

b) compound

c) element

d) compound

Explanation:

a) Hydrogen is the chemical element with the symbol H; is the lightest element in the periodic table.

b) Water: It is a substance whose molecule is composed of two atoms of hydrogen and one of oxygen.

⇒ molecular formula: H2O

c) gold: is the chemical element with the symbol Au. It is a very dense, soft and intense yellow metal.

d) sugar: it is a compound whose chemical formula is C12H22O11