1. D
2. B (I think)
If you ever talk about speed, you say (per) usually so always look for that in a label.
Answer: C
Explanation:
For this problem, we would use Charles's Law. We fill in what we are given and solve.
Charles's Law: 



Under acidic conditions, the solution is red, and under alkaline conditions, the solution is blue. Chemical reactions other than acid-base can also cause a color change to litmus paper. For instance, chlorine gas turns blue litmus paper white – the litmus dye is bleached, because of presence of hypochlorite ions.
So we end up with a total of four oxygen atoms for this calcium acetate unit and guys that truly it for this one.