List the controlled, independent and dependent variables of these chemical reactions.
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I REALLY NEED HELP PLEASE SOMEONE ANSWER THIS
Chemical Reactions:
-Iron and copper (II) sulfate solution
-Lead (II) nitrate and potassium iodide solutions
-Magnesium metal and hydrochloric acid solution
-Electrolysis of water-Burning magnesium

Iknow #2 is d. i just need to know why

Imagine that a new planet is discovered with two moons of equal mass: moon a and moon b. the mass of the new planet is greater than the combined mass of its moons. moon a is farther away from the new planet than moon b. what is the planet's gravitational pull on moon a compared to the planet's gravitational pull on moon b? the planet's gravity repels moon a with a greater force than it repels moon b, which is why moon a is farther away. the gravitational pull on moon b is greater than on moon a because moon b is closer to the new planet than moon a. the gravitational pull on moon b is greater than on moon a because moon b is farther away from the new planet than moon a. the gravitational pull on moon a is the same as the gravitational pull on moon b because distance does not affect the planet's gravity.

From the choices provided below, list the reagent(s) in order that will react with cyclopentanone to form the compound shown below.