Which of the following is NOT a chemical reaction? Select one:

a.
Hydrogen and oxygen combine to make water

b.
Ammonia breaks up into nitrogen and hydrogen

c.
Ice melts to form water

Some molecular compounds, such as hcl, ionize completely in solution. for molecular compounds such as h2co3, most molecules do not ionize in solution. which describes the properties of these two solutes? a. hcl and h2co3 have the same effect on the properties of the solution. b. hcl raises the freezing point of water more than h2co3 does. c. hcl raises the boiling point of water more than h2co3 does.