Question

balancing equations

1. h₂ + o₂ → h₂o
2. na + cl₂ → nacl
3. mg + o₂ → mgo
4. fe + o₂ → fe₂o₃
5. c + o₂ → co₂
6. n₂ + h₂ → nh₃
7. al + o₂ → al₂o₃
8. k + br₂ → kbr
9. zn + hcl → zncl₂ + h₂
10. cu + agno₃ → cu(no₃)₂ + ag
11. ca + h₂o → ca(oh)₂ + h₂
12. naoh + hcl → nacl + h₂o
13. bacl₂ + na₂so₄ → baso₄ + nacl
14. pb(no₃)₂ + ki → pbi₂ + kno₃
15. h₂so₄ + naoh → na₂so₄ + h₂o
16. ch₄ + o₂ → co₂ + h₂o
17. c₂h₆ + o₂ → co₂ + h₂o
18. c₃h₈ + o₂ → co₂ + h₂o
19. c₄h₁₀ + o₂ → co₂ + h₂o
20. nh₃ + o₂ → no + h₂o
21. h₂o₂ → h₂o + o₂
22. caco₃ → cao + co₂
23. na₂co₃ + hcl → nacl + co₂ + h₂o
24. fe + cuso₄ → feso₄ + cu
25. agno₃ + nacl → agcl + nano₃
26. al + hcl → alcl₃ + h₂
27. kclo₃ → kcl + o₂
28. na + h₂o → naoh + h₂
29. mg + hcl → mgcl₂ + h₂
30. ca + cl₂ → cacl₂

Explanation:

Step1: Balance hydrogen and oxygen in \(H_{2}+O_{2}\to H_{2}O\)

$$2H_{2}+O_{2}=2H_{2}O$$

Step2: Balance sodium and chlorine in \(Na + Cl_{2}\to NaCl\)

$$2Na+Cl_{2}=2NaCl$$

Step3: Balance magnesium and oxygen in \(Mg + O_{2}\to MgO\)

$$2Mg+O_{2}=2MgO$$

Step4: Balance iron and oxygen in \(Fe + O_{2}\to Fe_{2}O_{3}\)

$$4Fe + 3O_{2}=2Fe_{2}O_{3}$$

Step5: Balance carbon and oxygen in \(C + O_{2}\to CO_{2}\)

$$C+O_{2}=CO_{2}$$

Step6: Balance nitrogen and hydrogen in \(N_{2}+H_{2}\to NH_{3}\)

$$N_{2}+3H_{2}=2NH_{3}$$

Step7: Balance aluminium and oxygen in \(Al + O_{2}\to Al_{2}O_{3}\)

$$4Al+3O_{2}=2Al_{2}O_{3}$$

Step8: Balance potassium and bromine in \(K + Br_{2}\to KBr\)

$$2K+Br_{2}=2KBr$$

Step9: Balance zinc, hydrogen and chlorine in \(Zn + HCl\to ZnCl_{2}+H_{2}\)

$$Zn + 2HCl=ZnCl_{2}+H_{2}$$

Step10: Balance copper, silver, nitrogen and oxygen in \(Cu + AgNO_{3}\to Cu(NO_{3})_{2}+Ag\)

$$Cu + 2AgNO_{3}=Cu(NO_{3})_{2}+2Ag$$

Step11: Balance calcium, hydrogen and oxygen in \(Ca + H_{2}O\to Ca(OH)_{2}+H_{2}\)

$$Ca + 2H_{2}O=Ca(OH)_{2}+H_{2}$$

Step12: Balance sodium, oxygen, hydrogen and chlorine in \(NaOH + HCl\to NaCl + H_{2}O\)

$$NaOH + HCl=NaCl + H_{2}O$$

Step13: Balance barium, chlorine, sodium and sulphur in \(BaCl_{2}+Na_{2}SO_{4}\to BaSO_{4}+NaCl\)

$$BaCl_{2}+Na_{2}SO_{4}=BaSO_{4}+2NaCl$$

Step14: Balance lead, nitrogen, oxygen, potassium and iodine in \(Pb(NO_{3})_{2}+KI\to PbI_{2}+KNO_{3}\)

$$Pb(NO_{3})_{2}+2KI=PbI_{2}+2KNO_{3}$$

Step15: Balance hydrogen, sulphur, oxygen and sodium in \(H_{2}SO_{4}+NaOH\to Na_{2}SO_{4}+H_{2}O\)

$$H_{2}SO_{4}+2NaOH=Na_{2}SO_{4}+2H_{2}O$$

Step16: Balance carbon, hydrogen and oxygen in \(CH_{4}+O_{2}\to CO_{2}+H_{2}O\)

$$CH_{4}+2O_{2}=CO_{2}+2H_{2}O$$

Step17: Balance carbon, hydrogen and oxygen in \(C_{2}H_{6}+O_{2}\to CO_{2}+H_{2}O\)

$$2C_{2}H_{6}+7O_{2}=4CO_{2}+6H_{2}O$$

Step18: Balance carbon, hydrogen and oxygen in \(C_{3}H_{8}+O_{2}\to CO_{2}+H_{2}O\)

$$C_{3}H_{8}+5O_{2}=3CO_{2}+4H_{2}O$$

Step19: Balance carbon, hydrogen and oxygen in \(C_{4}H_{10}+O_{2}\to CO_{2}+H_{2}O\)

$$2C_{4}H_{10}+13O_{2}=8CO_{2}+10H_{2}O$$

Step20: Balance nitrogen, hydrogen and oxygen in \(NH_{3}+O_{2}\to NO + H_{2}O\)

$$4NH_{3}+5O_{2}=4NO + 6H_{2}O$$

Step21: Balance hydrogen and oxygen in \(H_{2}O_{2}\to H_{2}O+O_{2}\)

$$2H_{2}O_{2}=2H_{2}O+O_{2}$$

Step22: Balance calcium, carbon and oxygen in \(CaCO_{3}\to CaO+CO_{2}\)

$$CaCO_{3}=CaO+CO_{2}$$

Step23: Balance sodium, carbon, oxygen, hydrogen and chlorine in \(Na_{2}CO_{3}+HCl\to NaCl+CO_{2}+H_{2}O\)

$$Na_{2}CO_{3}+2HCl=2NaCl+CO_{2}+H_{2}O$$

Step24: Check the balance of iron, copper, sulphur and oxygen in \(Fe + CuSO_{4}\to FeSO_{4}+Cu\)

$$Fe + CuSO_{4}=FeSO_{4}+Cu$$

Step25: Check the balance of silver, nitrogen, oxygen, sodium and chlorine in \(AgNO_{3}+NaCl\to AgCl+NaNO_{3}\)

$$AgNO_{3}+NaCl=AgCl+NaNO_{3}$$

Step26: Balance aluminium, hydrogen and chlorine in \(Al + HCl\to AlCl_{3}+H_{2}\)

$$2Al + 6HCl=2AlCl_{3}+3H_{2}$$

Step27: Balance potassium, chlorine and oxygen in \(KClO_{3}\to KCl+O_{2}\)

$$2KClO_{3}=2KCl+3O_{2}$$

Step28: Balance sodium, hydrogen and oxygen in \(Na + H_{2}O\to NaOH+H_{2}\)

$$2Na + 2H_{2}O=2NaOH+H_{2}$$

Step29: Balance magnesium, hydrogen and chlorine in \(Mg + HCl\to MgCl_{2}+H_{2}\)

$$Mg + 2HCl=MgCl_{2}+H_{2}$$

Step30: Balance calcium and chlorine in \(Ca + Cl_{2}\to CaCl_{2}\)

$$Ca + Cl_{2}=CaCl_{2}$$

Answer:

1. \(2H_{2}+O_{2}=2H_{2}O\)
2. \(2Na+Cl_{2}=2NaCl\)
3. \(2Mg+O_{2}=2MgO\)
4. \(4Fe + 3O_{2}=2Fe_{2}O_{3}\)
5. \(C+O_{2}=CO_{2}\)
6. \(N_{2}+3H_{2}=2NH_{3}\)
7. \(4Al+3O_{2}=2Al_{2}O_{3}\)
8. \(2K+Br_{2}=2KBr\)
9. \(Zn + 2HCl=ZnCl_{2}+H_{2}\)
10. \(Cu + 2AgNO_{3}=Cu(NO_{3})_{2}+2Ag\)
11. \(Ca + 2H_{2}O=Ca(OH)_{2}+H_{2}\)
12. \(NaOH + HCl=NaCl + H_{2}O\)
13. \(BaCl_{2}+Na_{2}SO_{4}=BaSO_{4}+2NaCl\)
14. \(Pb(NO_{3})_{2}+2KI=PbI_{2}+2KNO_{3}\)
15. \(H_{2}SO_{4}+2NaOH=Na_{2}SO_{4}+2H_{2}O\)
16. \(CH_{4}+2O_{2}=CO_{2}+2H_{2}O\)
17. \(2C_{2}H_{6}+7O_{2}=4CO_{2}+6H_{2}O\)
18. \(C_{3}H_{8}+5O_{2}=3CO_{2}+4H_{2}O\)
19. \(2C_{4}H_{10}+13O_{2}=8CO_{2}+10H_{2}O\)
20. \(4NH_{3}+5O_{2}=4NO + 6H_{2}O\)
21. \(2H_{2}O_{2}=2H_{2}O+O_{2}\)
22. \(CaCO_{3}=CaO+CO_{2}\)
23. \(Na_{2}CO_{3}+2HCl=2NaCl+CO_{2}+H_{2}O\)
24. \(Fe + CuSO_{4}=FeSO_{4}+Cu\)
25. \(AgNO_{3}+NaCl=AgCl+NaNO_{3}\)
26. \(2Al + 6HCl=2AlCl_{3}+3H_{2}\)
27. \(2KClO_{3}=2KCl+3O_{2}\)
28. \(2Na + 2H_{2}O=2NaOH+H_{2}\)
29. \(Mg + 2HCl=MgCl_{2}+H_{2}\)
30. \(Ca + Cl_{2}=CaCl_{2}\)