# Chemistry

posted by .

I know mathematically I can write chemical reactions this way but in chemistry can I if now why?

2K + 2(H20) yields 2KOH + H2
2(K + H20) yields 2KOH + H2

can I also do this if not why?

2(CO) + O2 yields 2(CO2)
O(2C + O) Yields 2(CO2)

I don't see why I cant do any of these things as mathematically they make complete sense to me I just wanted to make sure I wasn't breaking some rule and if I am why is this rule in place? Thanks

• Chemistry -

Mathematically it makes sense and I think almost any chemist would know what you were doing. I don't know that there is a specific rule against it but I strongly suspect that some profs would not allow it. The most important point I can make, however, is that the parentheses are not needed (and that is where the profs that were against it would complain) because they are understood to be there. For example, when we write 2CO it is UNDERSTOOD that C and O are multiplied by 2. 2H2O and it is UNDERSTOOD that both H and O are multiplied by 2 to give 4 H atoms and 2 O atoms. So for you to place parentheses around everything that uses a coefficient is almost like an exercise in futility. You don't need them. They are completely unnecessary. They are just added work and they mean nothing extra that isn't already understood by the rules on equations. Furthermore, I wonder how you would write 2Cu(NO3)2. Something like 2[Cu(NO3)2]. Again, completely unnecessary. The coefficient 2 tells you everything that follows is multiplied by 2, the parentheses tell you that everything WITHIN the parentheses is multiplied by the subscript.
Now for the 2(K + H2O) ==> 2KOH + H2
Frankly, I doubt that any chemistry prof would let you do it, at least publicly, for at least two reasons.
a. It isn't consistent as there are no parentheses around 2(KOH).
b. It becomes more difficult to look at the equation and know that it is or is not balanced. True that it can be done with a little time but it will take extra time and the technique isn't worth the confusion.
You might talk to your prof and see what s/he says. If I were your prof I would do my utmost to deter you from all of the extra work you would be bringing upon yourself. And the 2(K + H2O) thing I would not allow. Too confusing.

## Similar Questions

1. ### INPC

how would you balance the chemical equation K + H2O > koh + h2 Try 2K 2HOH >>>2KOH + H2 2K 2HOH >>>2KOH + H2;I am a chemistry teacher so yeah bobpursley is right!
2. ### Chemistry

Just wanted to check this. Are the two half reactions for 2K+CaSO4 yields K2SO4+Ca 1K yields K^+1 + e^- and Ca^+2 + e^-2 yields Ca?
3. ### chemistry

Complete the folling reactions by writing the structures of the expected products & by naming the reactants & products HCl a) CH3COOCH3 + H20 ---> ?
4. ### chemistry

can you check if i write the reaction right CH3NH2 + HClO4 yields CH3NH3ClO4 then CH3NH3ClO4 yields CH3NH3 + ClO4 then CH3NH3 + H20 yield CH3NH4+ + OH-
5. ### chemistry

at standard pressure, which has the highest average kinetic energy?
6. ### Chemistry

Using the solution: NaOH + HCl yields NaCl + H20 What mass of H20 would be produced by combining 10.0 mL of each reagent?
7. ### chem

the combustion of 1.83 grams of a compound which only contains C,H, and O yields 4.88 grams of CO2, and 1.83 grams of H2O. What is the empirical formula of this compound?
8. ### chemistry

consider the following changes at constant temperature & pressure H2O(s) --yields-- H20(l); Delta H1 H2O(l) --yields-- H2O(g); Delta H2 H2O(g) --yields-- H2O(s); Delta H3 Using Hess's law, the sum of the deltas is a. equal to 0 b. …
9. ### AP Chemistry

Calculate delta H fro the following equation: H20(l, 50.0 C) yields H20(s, -10.0 C)
10. ### Chemistry

2) What is the empirical formula of a compound containing C, H, O if combustion of 1.23g of the compound yields 1.8g CO2 and .74g of H2O 3) What are the empirical and molecular formulas of a hydrocarbon if combustion of 2.10g of the …

More Similar Questions