+rep to the person who helps me:

? + water -> Zinc ? + ?

Zinc + Sulphuric Acid -> ? + Hydrogen.

Tin + Hydrocloric Acid -> ? + Hydrogen.

Iron + Nitric Acid -> ? + ?

Lead + ? -> Lead Chloride + ?

Lithium + ? -> Lithium Nitrate + ?

Potassium + ? -> Potassium Sulphide + ?

DONT have to answer to all of the questions (greatful if you could and you get +2rep)