PLEASE HELP

Which reaction is an example of a synthesis reaction?

Question 1 options:

4H+O2→2H2O

C7H16+11O2→7CO2+8H2O

Cl2 + 2NaBr→ Br2 + 2NaCl

2Na + 2H2O→2NaOH + H2

Question 2 (1 point)
Which statement is true about synthesis reactions?

Question 2 options:

They must have one or more reactants.

They must have two or more reactants.

They must have more than one product.

They must have two or more products.

Question 3 (1 point)
Why is Cl2 + KI→ KCl +I2 not a synthesis reaction?

Question 3 options:

Oxygen is not a product in this reaction.

Oxygen is not a reactant in this reaction.

The reaction has more than one product.

The reaction has more than one reactant.

Question 4 (1 point)
Which equation is the balanced chemical equation for the synthesis reaction for the formation of sulfur dioxide (SO2) ?

Question 4 options:

2S + O2→SO2

S + 2O2→4SO2

S + O2→SO2

S + O2→2SO2

Question 5 (1 point)
Which of the following represents the balanced chemical equation for the synthesis reaction that forms magnesium oxide?

Question 5 options:

Mg+O2→MgO

2Mg+2O2→2MgO

2Mg+O2→2MgO

2Mg+3O2→3MgO