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Chemistry Half (1/2) Equations

I'm stuck on how to answer these questions. P.S. I'm new to AS Level Chemistry, and have not long started the course.

1. Complete the following 1/2 equations:

Fe+ (-) ? -> Fe2+
Cu+ (+) ? -> Cu
At- (-) 2e -> ?
2S2- (-) 4e -> ?

For the first two blanks, I put an 'e' for electron. Are they right, and would anyone be able to help me with the others?

Thanks!
Original post by ryanjj14
I'm stuck on how to answer these questions. P.S. I'm new to AS Level Chemistry, and have not long started the course.

1. Complete the following 1/2 equations:

Fe+ (-) ? -> Fe2+
Cu+ (+) ? -> Cu
At- (-) 2e -> ?
2S2- (-) 4e -> ?

For the first two blanks, I put an 'e' for electron. Are they right, and would anyone be able to help me with the others?

Thanks!

I always think about it as balancing the charges:

e.g. Q2: Cu+ + (?) -> Cu

Copper charge is changing from +1 to 0, so it is losing 1 charge, the same as gaining an electron

Your answer for Q1 is also right.

Using the principle of charges, I think you can complete q3 quite easily.
For q4, the electrons will be split between all atoms equally. You will get equally charged ions, but what charge will they have?

:smile:

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