Why didn't we take into account charges

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Bijal Luhar
Posts: 33
Joined: Fri Apr 06, 2018 11:03 am

Why didn't we take into account charges

Postby Bijal Luhar » Tue May 01, 2018 1:27 pm

I was wondering why when we were learning to balance equations, why didn't we take into account charges of elements. Because you are supposed to balance coefficients and the charge.

Nahelly Alfaro-2C
Posts: 59
Joined: Wed Nov 15, 2017 3:04 am

Re: Why didn't we take into account charges

Postby Nahelly Alfaro-2C » Tue May 01, 2018 5:15 pm

We don't take into consideration the electron charge of the elements because when they put with another element they balance each other. For example, water uses hydrogen and oxygen. hydrogen has a +1 charge while oxygen has a -2 charge with is why it water requires two hydrogens to satisfy oxygens octet rule. The same thing with sodium chloride, sodium has a +1 charge while chloride has -1 charge when put together the charges are eliminated because of they neutral. In balancing an equation you are looking to add stoichiometric coefficients to make the equation balanced.
For instance, the book uses the equation H2+O2---->H20. You need to add a 2 for the hydrogen in the reactant and a 2 in the product side to make it balanced.

Jake Gordon 1A
Posts: 61
Joined: Fri Sep 28, 2018 12:15 am

Re: Why didn't we take into account charges

Postby Jake Gordon 1A » Tue Oct 02, 2018 6:30 pm

To the best of my knowledge unless it is an ion(charged particle), the net charge on each individual compound will be 0. These numbers will be pre-set based on the given compounds. The only thing that needs to be altered is the coefficients. For example H20 will always be H20 you can't change the charges h carries a +1 and o a -2 in proper proportion they cancel out, they are fine, they are neutral. The only difference during balancing chemical equations is the molar ratios (coefficients) that must be deduced based on the law of conservation of mass.

Matthew Tran 1H
Posts: 165
Joined: Fri Sep 28, 2018 12:16 am

Re: Why didn't we take into account charges

Postby Matthew Tran 1H » Tue Oct 02, 2018 10:54 pm

You should be careful with the word "charge" as it implies that the atom in question is an ion; hydrogen and oxygen in H2O are NOT ions because water is a covalent compound! However, hydrogen does have an oxidation number of +1 and oxygen has an oxidation number of -2. In response to the OP, all the questions so far have only dealt with neutral covalent and ionic compounds, so you do not need to worry about charges on the reactants and products since there are none.

Chloe Qiao 4C
Posts: 65
Joined: Fri Sep 28, 2018 12:27 am

Re: Why didn't we take into account charges

Postby Chloe Qiao 4C » Thu Oct 04, 2018 8:56 am

Don't worry about charges so much for now because we are not balancing ions but mostly molecules. Pay more attention to the charges and electrons when doing problems with redox reactions later.


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