Answer:
Net ionic: 
Explanation:
in
reacts with
to form
and
.
Due to this acid-base reaction,
become soluble whenever
is added to suspension of
.
In this reaction,
acts as an acid and
acts as a base.
Molecular equation: 
Total ionic: 
Net ionic: 
Answer: the mass of the object
Explanation: To find density, the equation d= m/v is needed where m= mass and v= volume
I would personally say C. Energy only...
I think it might be 2 but I could be mistaken sorry if I am