Question

In the final chemical equation, HF and O2 are the products that are formed through the reaction between H2O and F2. Before you can add these intermediate chemical equations, you need to alter them by multiplying the
A.second equation by 2 and reversing the first equation.
B.first equation by 2 and reversing it.
C.first equation by (1/2) and reversing the second equation.
D.second equation by 2 and reversing it.

Answer 1

We need to multiply the 2nd equation by two and reverse it.

Option D

Explanation:

In the 2nd reaction, it says H₂ +F₂ =2HF.

So, multiplying it by 2 gives 2H₂ + 2F₂ = 4HF.

Reversing it gives 4HF = 2H₂ +2F₂.

Now the 1st equation says 2H₂ +O2 =2H₂O.

Adding them gives

2H₂ +O₂ +4HF = 2H₂ +2F₂ +2H₂O.

Or, O₂ +4HF = 2H₂O + 2F₂.

this is the balanced reaction.

Answer 2

Answer:

Option A: Second equation by 2 and reversing the first equation

Explanation:

In order for the equation to become balanced by elements, dividing the second equation by 2 and then reversing the first equation to simplify the equation correctly is how you can then add the intermediate chemical equations. Took the test on edg and it was correct :)