16. Identify each of the following reactions as a synthesis, decomposition, or exchange reaction:
2Hg + O2 + 2HgO
Fe2+ + CuSO4 → FeSO4 + Cu2+
HCl + NaOH → NaCl + H2O
HNO3 → H+ + NO3-

currents is the correct answer.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

here is your answer hope i .

when it is at an intermediate population density