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. c₂h₄ + 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

$$2H_{2}+O_{2}\to 2H_{2}O$$

Step2: Balance sodium and chlorine

$$2Na + Cl_{2}\to 2NaCl$$

Step3: Balance magnesium and oxygen

$$2Mg+O_{2}\to 2MgO$$

Step4: Balance iron and oxygen

$$4Fe + 3O_{2}\to 2Fe_{2}O_{3}$$

Step5: Balance carbon and oxygen

$$C+O_{2}\to CO_{2}$$

Step6: Balance nitrogen and hydrogen

$$N_{2}+3H_{2}\to 2NH_{3}$$

Step7: Balance aluminium and oxygen

$$4Al + 3O_{2}\to 2Al_{2}O_{3}$$

Step8: Balance potassium and bromine

$$2K+Br_{2}\to 2KBr$$

Step9: Balance zinc, hydrogen and chlorine

$$Zn + 2HCl\to ZnCl_{2}+H_{2}$$

Step10: Balance copper, silver and nitrate

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

Step11: Balance calcium, hydrogen and oxygen

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

Step12: Balance sodium, hydrogen, chlorine and oxygen

$$NaOH+HCl\to NaCl + H_{2}O$$

Step13: Balance barium, chlorine, sodium and sulfate

$$BaCl_{2}+Na_{2}SO_{4}\to BaSO_{4}+2NaCl$$

Step14: Balance lead, nitrate, potassium and iodine

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

Step15: Balance sulfuric acid, sodium hydroxide, sodium sulfate and water

$$H_{2}SO_{4}+2NaOH\to Na_{2}SO_{4}+2H_{2}O$$

Step16: Balance methane, oxygen, carbon dioxide and water

$$CH_{4}+2O_{2}\to CO_{2}+2H_{2}O$$

Step17: Balance ethylene, oxygen, carbon dioxide and water

$$C_{2}H_{4}+3O_{2}\to 2CO_{2}+2H_{2}O$$

Step18: Balance propane, oxygen, carbon dioxide and water

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

Step19: Balance butane, oxygen, carbon dioxide and water

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

Step20: Balance ammonia, oxygen, nitric oxide and water

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

Step21: Balance hydrogen peroxide, water and oxygen

$$2H_{2}O_{2}\to 2H_{2}O+O_{2}$$

Step22: Balance calcium carbonate, calcium oxide and carbon dioxide

$$CaCO_{3}\to CaO+CO_{2}$$

Step23: Balance sodium carbonate, hydrochloric acid, sodium chloride, carbon dioxide and water

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

Step24: Balance iron, copper sulfate, iron sulfate and copper

$$Fe+CuSO_{4}\to FeSO_{4}+Cu$$

Step25: Balance silver nitrate, sodium chloride, silver chloride and sodium nitrate

$$AgNO_{3}+NaCl\to AgCl+NaNO_{3}$$

Step26: Balance aluminium, hydrochloric acid, aluminium chloride and hydrogen

$$2Al + 6HCl\to 2AlCl_{3}+3H_{2}$$

Step27: Balance potassium chlorate, potassium chloride and oxygen

$$2KClO_{3}\to 2KCl+3O_{2}$$

Step28: Balance sodium, water, sodium hydroxide and hydrogen

$$2Na+2H_{2}O\to 2NaOH+H_{2}$$

Step29: Balance magnesium, hydrochloric acid, magnesium chloride and hydrogen

$$Mg + 2HCl\to MgCl_{2}+H_{2}$$

Step30: Balance calcium and chlorine

$$Ca+Cl_{2}\to CaCl_{2}$$

Answer:

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