Can anyone elp me with chemistry ? ? i will be asking multiple questions but even if you can only answer one-- i will still deeply appreciate ! (these are the one's im unsure

3. identify the reducing agent in the following equation: 2 al(s) + 3 h2so4 (aq) arrow al2(so4)3 (aq) + 3 h2 (g).

a. al (s) *
b. h2so4 (aq)
c. al2(so4)3 (aq)
d. h2 (g)

9. how many milliliters are 0.200 m hcl are required to react completely with 25.0 milliliters of 0.100 m methylamine, ch3nh2?

a. 5.00 ml
b. 6.25 ml
c. 12.5 ml *
d. 25.0 ml

16. a solution has a [oh−] of 1 x 10−9. what is the poh of this solution?

a. 5
b. 7
c. 9 *
d. 12

17. if a small amount of excess acid is added to a buffered solution, the ph of the solution should:

a. change sharply and then neutralize *
b. remain very close to the original ph value
c. fluctuate rapidly between high and low values and then achieve a neutral balance
d. neutralize instantaneously

18.compared to other main group hydrides, such as ch4, nh3, h2s and hf, water is unique because it is a liquid at room temperature. the most likely explanation for this is that:

a. water is more plentiful than any of these other compounds.
b. water contains oxygen and since oxygen has a high boiling point, so should water.
c. water's structure allows for the formation of multiple hydrogen bonds with other molecules, including itself. *
d. water is able to dissolve nonpolar gases like oxygen and carbon dioxide.

28. predict whether the following double-replacement reaction will produce a precipitate: mgcl2 + li2co3 arrow mgco3 + 2 licl.

a. no; all products are soluble
b. yes; the mgco3 will precipitate *
c. yes; the licl will precipitate
d. yes; both the mgco3 and the licl will precipitate

btw i added a * to the answers i think are correct.