Single and double replacement reactions wkst 2

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

What are the variables in gay-lussac’s law? pressure and volume pressure, temperature, and volume pressure and temperature volume, temperature, and moles of gas

In the lab, ammonia was mixed with water to form ammonium hydroxide. what is/are the reactant(s)? o water and ammonia o ammonia o ammonium hydroxide need