The following balanced equations represent double replacement reactions that each result in the formation of precipitation. for each reaction, which ratio of reactants would result in the formation of the greatest amount of precipitate? cu(no3)2(aq) -> cu(oh)2(s)+ 2nano3 (aq) note: cu(oh)2 is a blue precipitate.
feso4 (aq) + 2naoh (aq) -> fe(oh)2 (s) + na2so4 (aq) note: fe(oh)2 is a dark green precipitate.

fe(no3)3 (aq) + 3naoh (aq) -> fe(oh)3 (s) + 3nano3 (aq) note: fe(oh)3 is a red-orange precipitate

1) Cu(NO₃)₂(aq) + 2NaOH (aq) -> cu(OH)₂(s)+ 2NaNO₃ (aq)

   reactants ratio = Cu(NO₃)2 : NaOH  = 1:2

2) FeSO₄ (aq) + 2NaOH (aq) ->Fe(OH)₂ (s) + Na₂SO₄ (aq)

  reactants ratio = FeSO₄  : NaOH  = 1:2

3) Fe(NO₃)₃ (aq) + 3NaOH (aq) -> Fe(OH)₃ (s) + 3NaNO₃ (aq)

  reactants ratio = Fe(NO₃)₃  : NaOH  = 1:3

Explanation:

For any reaction to occur completely, the ratio of the reactants should be the ratio of their coefficients is the balanced chemical equation.

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.

In our case, we get greatest amount of precipitate only when the reactants completely undergo chemical change and turn into products.

so, when reactants are taken in the ration of balanced equation, the reactants completely form products, where here one of the products is precipitate.

1) Cu(NO₃)₂(aq) + 2NaOH (aq) -> cu(OH)₂(s)+ 2NaNO₃ (aq)

   reactants ratio = Cu(NO₃)2(aq) : NaOH (aq) = 1:2

2) FeSO₄ (aq) + 2NaOH (aq) ->Fe(OH)₂ (s) + Na₂SO₄ (aq)

  reactants ratio = FeSO₄ (aq) : NaOH (aq) = 1:2

3) Fe(NO₃)₃ (aq) + 3NaOH (aq) -> Fe(OH)₃ (s) + 3NaNO₃ (aq)

  reactants ratio = Fe(NO₃)₃ (aq) : NaOH (aq) = 1:3  

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance