The elements are carbon and hydrogen, C and H. they're linked by single bonds.
State of matter
Mercury.
CaSO4 calcium, Sulfur, and four Oxygen
Sodium Chloride, or NaCl, is a chemical compound made up of Sodium (Na) and Chlorine (Cl).
This depends on your definition of an acid. The answer is presumably Hydrogen, because most definitions of acids and bases require compounds to donate H+ ions or produce H+ ions. However, there is an...