Question

Drag each number to the correct location on the equation. Each number can be used more than once, but not all numbers will be used.

Balance the equation with the correct coefficients.

Answer 1

`SiO_(2)  + 4 HF --->  SiF_(4)  +  2 H_(2) O`

Step-by-step explanation:

The mass of the products in a chemical reaction must be equal to the reactants mass. As is stablish in the mass conservation law.

First look at the elements present in the equation.

`SiO_(2)  +  HF --->  SiF_(4)  +  H_(2) O`

Make a list of the atoms present in each side of the equation.

Then write the quantity ( number) in which they are present:

Si 1 Si 1

O 2 O 1

H H2

F F 4

As you can see, in the product side of the equation you have 4 atoms of Fluorine F, and 2 of hydrogen H, first try to balance by adding a 4 to the reactant HF.

Now you will have to add a leading 4 in the reactants side. But now you need to balance the H and the O.

`SiO_(2)  +  4 HF --->  SiF_(4)  +  H_(2) O`

You will have the following information:

Si 1 Si 1

O 2 O 1

H 4 H2

F 4 F 4

If you add a 2 coefficient in the water you will have everything balanced

`SiO_(2)  + 4 HF --->  SiF_(4)  +  2 H_(2) O`