well, in order to form a compound, there needs to be energy that triggers for formation. But what you have to do is know if it is an actual compound. I really am not sure what you're talking about when you say add or subtract... that doesn't exist in the chemistry vocabulary...
if you are talking about balancing a chemical formula, you just add the numbers to the front of the elements so that each side has the same amounts of elements to the other side.
Although I'm not sure if that's right because usually H2CO3 is neutral.
Basically a chemical equation is written when you want to express the fact that you put some chemicals together in a specific proportion to get other chemicals in another specific proportion.
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Ahhh.. it's tough to explain because there are many ways and it depends what types of compounds you have...
subtract? add? ..... -_-
well, in order to form a compound, there needs to be energy that triggers for formation. But what you have to do is know if it is an actual compound. I really am not sure what you're talking about when you say add or subtract... that doesn't exist in the chemistry vocabulary...
if you are talking about balancing a chemical formula, you just add the numbers to the front of the elements so that each side has the same amounts of elements to the other side.
you can't.
what you have there is a chemical equation
HCO3 + H+ --> H2CO3-
Although I'm not sure if that's right because usually H2CO3 is neutral.
Basically a chemical equation is written when you want to express the fact that you put some chemicals together in a specific proportion to get other chemicals in another specific proportion.