in chemistry how do you balance equations and how do you biheart the valency?

Answer 1

Whoa..first of all..

You ARE NOT gonna memorize anything!! Not cool!! I studied in India till Grade 2 only..and all they made me to do was memorize it..

Listen, balancing chem equations are pretty easy..

First of all, write down the given equation. For example, let's say you wanna combust methane (CH4), you first write out an UNBALANCED hydrocarbon combustion.

CH4 + 02 --> C02 + H20

Now as you can see, you have 4 protons (hydrogens) on the left, but only 2 on the right. So, you put a 2 in front of the water on the right. The 2 will multiply with the 2 in the middle of water to give 4 hydrogens.

CH4 + 02 --> C02 + 2H20

Now you realize that you have 4 oxygens on the right - two with carbon and two with water. So, you put a 2 in front of the oxygen molecule on the left to get 2O2, which is 4.

CH4 + 202 --> C02 + 2H20

Tada..you have a balanced equation.

Note: for hydrocarbon combustions, balance using CHO, ie. balance carbon first, next hydrogen, next oxygen.

:)

Answer 2

ok you dont have to memorize them. know that both side of the equations must be balanced.
For Example: HCl+NaOH gives you Nacl+H2O(Water). See Hydrogens are not balanced.
So your final balanced equation must be 2NaOH+2HCl gives 2NaCl+2H2O(Water).
That's it. if you still experience do some problems like these. I hope this will help.

Answer 3

Hi! balancing equasions isn't as hard as it sounds. first, lets say you have an equasion like this.

H2O to H2 + O2
then, in the front there would be two 'h' and one 'o'. on the other side, there is two 'h' and two 'o'. from now on, it is basically math. what ever you add to one side, you have to add to the other.(the twos behind the numbers are suposed to be lowered. in H2O the two is lowered to the H) if you add a two in front of the h in 'H2O' and a two in front of 'H2' then the equasion would be balanced.

H2O to H2 + O2

2H2O to 2H2 + 2O2

now 'h' has four on both sides and o has two on both sides.

Answer 4

yup... he had already answered your question, getting a balanced net ionic equation is a different one, and also redox reaction... they have different ways of balancing... i think you need that later...

Answer 5

Karthiban has the correct one, select him for the best answer.