To balance chemical equations, you just need to put a number on the left side of the given element or compound (called the coefficient) to make the number of atoms the same as the reactants side (left side) or product side (right side) of the equation.
If there’s no number of the left side of the element / compound, it means the coefficient is just 1, though you don’t need to put 1 (but in your case where there’s spaces on the left side in your test, I think you should put 1).
Say for example in no. 4: the balanced equation of H2 + O2 → H2O is 2H2 + O2 → 2H2O. You just need to put 1 beside O2, so
Answers & Comments
Answer:
1) N2 + H2 → NH3
Balanced Equation: N2 + 3 H2 → 2 NH3
2) KClO3 → KCl + O2
Balanced Equation: 2 KClO3 → 2 KCl + 3 O2
3) NaCl + F2 → NaF + Cl2
Balanced Equation: 2 NaCl + F2 → 2 NaF + Cl2
4) H2 + O2 → H2O
Balanced Equation: 2 H2 + O2 → 2 H2O
5) Pb(OH)2 + HCl → H2O + PbCl2
Balanced Equation: Pb(OH)2 + 2 HCl → 2 H2O + PbCl2
6) AlBr3 + K2SO4 → KBr + Al2(SO4)3
Balanced Equation: 2 AlBr3 + 3 K2SO4 → 6 KBr + Al2(SO4)3
7) CH4 + O2 → CO2 + H2O
Balanced Equation: CH4 + 2 O2 → CO2 + 2 H2O
8) C3H8 + O2 → CO2 + H2O
Balanced Equation: C3H8 + 5 O2 → 3 CO2 + 4 H2O
9) C8H18 + O2 → CO2 + H2O
Balanced Equation: 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O
10) FeCl3 + NaOH → Fe(OH)3 + NaCl
Balanced Equation: FeCl3 + 3 NaOH → Fe(OH)3 + 3 NaCl
Explanation:
To balance chemical equations, you just need to put a number on the left side of the given element or compound (called the coefficient) to make the number of atoms the same as the reactants side (left side) or product side (right side) of the equation.
If there’s no number of the left side of the element / compound, it means the coefficient is just 1, though you don’t need to put 1 (but in your case where there’s spaces on the left side in your test, I think you should put 1).
Say for example in no. 4: the balanced equation of H2 + O2 → H2O is 2 H2 + O2 → 2 H2O. You just need to put 1 beside O2, so
2 H2 + 1 O2 → 2 H2O.