Iam a beginner with chemical equations.please help me with writing valancy of an equation and balancing an equation with at least 4 or 5examples.I want to understand it perfectly,please help.
simple examples like
H2 +H2+O2=H2O+H2O=2H2O
pls explain the example as well.
tgypoi
Favorite Answer
It's easy, really. You just have to make sure you have the same thing on both sides.
An easy example, precipitation of silver chloride:
NaCl + AgNO3 -> NaNO3 + AgCl
On the left we have 1 Na, 1 Cl, 1Ag, and 1 NO3
On the right we have 1 Na, 1 NO3 1AG and 1 Cl
It's the same, so we don't need to do anything.
A hard one: burning petrol
The basic equation:
C8H10 + O2 -> CO2 + H2O
On the left we have 8 C's, but we only have one on the right, also we have 10 H's on the left, and only 2 on the right so we make it:
C8H10 +O2 -> 8CO2 + 5H2O
Now we have 21 O's on the right, but only 2 on the left:
C8H10 + 10 1/2O2 -> 8CO2 + 5H2O
In the olden days you could leave it like this, but these days the convention is to double them all so you get whole numbers:
2C8H10 + 21O2 -> 16CO2 + 10H20
:)
Anonymous
lol im in yar 10 and were doing that in my chem & phys class. the teacher we had said it was just a matter of trial and error. alsoo said something to do with starting with the one that are closest together