I think what you are thinking of is the decomposition of Hydrogen peroxide, which has the equation:
2H2O2 --> O2 + 2H2O which when balanced then equals 8.
2(H2O2) --> 2H2O +O2
|4*2|=8 -->|3*2|=6 +2= 8
That is the entire equation completed and balanced. Hope it helped!
2 h2o2-->2 h2o + o2, hydrogen peroxide is relatively unstable and can be broken down by heat, agitation, contact with many substances, including tissue, light.
2K+Cl2------->2KCl
2Na + 2H2O = 2NaOH + H2
you have to write... 2KI + Cl2 = 2KCl + I2
Na2O + CO2 -> Na2CO3 Balanced as is and I would call this a synthesis reaction.
2KI + Cl2 = 2KCl + I2
2K+Cl2------->2KCl
If you had the equation of H2O2(aq) ==> H2O(l) + O2(g), it wouldn't be balanced, so is incorrect. If it were 2H2O2 ==> 2H2O + O2, then it would be balanced, and H2O2 would be an example of a disproportionation reaction, where H2O2 is both the oxidizing and reducing agent, i.e., the O is both oxidized and reduced to form H2O and O2. Not sure if this is what you are looking for as the question is rather vague.
S + 2Cl --> SCl2
2Na + 2H2O = 2NaOH + H2
No. There are two O's on the right side and three on the left. The balanced form is 2 H202 -> 2 H20 + 02. All of the O's are the letter 0 in this equation. All numbers are subscripts except the two 2's in front of the H's that have a space after them. I've taken college-level chemistry, so I remember how to do this.
you have to write... 2KI + Cl2 = 2KCl + I2
N2 + 3H2 --> 2NH3 N2 + 3H2 --> 2NH3
Na2O + CO2 -> Na2CO3 Balanced as is and I would call this a synthesis reaction.
Sodium reacts with water to form sodium hydroxide and hydrogen. The balanced equation is 2Na + 2H2O --> 2NaOH + H2.
2KI + Cl2 = 2KCl + I2
This equation is 3 BaCl2 + Al2(SO4)3 -> 3 Ba(SO4) + 2 AlCl3.
Equations are oftentimes used to represent chemical reactions. They have to be in the lowest form for it to be considered a balanced equation.