Identify the following structure as an atom, molecule, or compound molecule. Hydrogen

A. atoms
B. molecules
C. compound molecules

Smog is the term used to describe the combination of fog and smoke

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j

If 16.00g of hydrogen gas reacts with 126.73g of oxygen, how many grams of water are yielded? (both reactants are completely consumed in the reaction.)