Worksheet for practicing balancing chemical equations, featuring 20 problems and sections on identifying reaction types.

Here are the balanced chemical equations and the reaction types for your worksheet.

Part 1: Balancing Chemical Equations

To balance these, we make sure the number of atoms for each element is the same on both the left (reactants) and right (products) sides.

1. Zn + 2AgNO₃ → Zn(NO₃)₂ + 2Ag
* (1 Zinc, 2 Silver, 2 Nitrate groups on both sides)
2. N₂ + 3H₂ → 2NH₃
* (2 Nitrogen, 6 Hydrogen on both sides)
3. NaCl + AgC₂H₃O₂ → NaC₂H₃O₂ + AgCl
* (Already balanced! 1 of everything on both sides)
4. 3Mg(OH)₂ + 2H₃PO₄ → 6H₂O + Mg₃(PO₄)₂
* (3 Magnesium, 2 Phosphate groups, 12 Hydrogen, 14 Oxygen on both sides)
5. 2HNO₃ + Ni → Ni(NO₃)₂ + H₂
* (1 Nickel, 2 Nitrate groups, 2 Hydrogen on both sides)
6. Ba(HCO₃)₂ → BaCO₃ + H₂O + CO₂
* (Already balanced! 1 Barium, 2 Carbon, 2 Hydrogen, 6 Oxygen on both sides)
7. BaCl₂ + Na₂SO₄ → 2NaCl + BaSO₄
* (1 Barium, 2 Chlorine, 2 Sodium, 1 Sulfate on both sides)
8. Al₂(CO₃)₃ → Al₂O₃ + 3CO₂
* (2 Aluminum, 3 Carbon, 9 Oxygen on both sides)
9. Ca + 2H₂O → Ca(OH)₂ + H₂
* (1 Calcium, 2 Hydrogen, 2 Oxygen on both sides)
10. 2LiHCO₃ → Li₂CO₃ + H₂O + CO₂
* (2 Lithium, 2 Hydrogen, 2 Carbon, 6 Oxygen on both sides)
11. 2N₂ + 5O₂ → 2N₂O₅
* (4 Nitrogen, 10 Oxygen on both sides)
12. MgBr₂ + 2KOH → 2KBr + Mg(OH)₂
* (1 Magnesium, 2 Bromine, 2 Potassium, 2 Hydroxide groups on both sides)
13. Mn + 2CuCl → 2Cu + MnCl₂
* (1 Manganese, 2 Copper, 2 Chlorine on both sides)
14. 8Zn + S₈ → 8ZnS
* (8 Zinc, 8 Sulfur on both sides)
15. 2NaOH + H₂SO₄ → 2H₂O + Na₂SO₄
* (2 Sodium, 1 Sulfate, 4 Hydrogen, 6 Oxygen on both sides)
16. 2K + 2H₂O → 2KOH + H₂
* (2 Potassium, 4 Hydrogen, 2 Oxygen on both sides)
17. C₅H₁₂ + 8O₂ → 6H₂O + 5CO₂
* (5 Carbon, 12 Hydrogen, 16 Oxygen on both sides)
18. 2KOH + H₂CO₃ → 2H₂O + K₂CO₃
* (2 Potassium, 1 Carbonate, 4 Hydrogen, 5 Oxygen on both sides)
19. C₄H₈O₂ + 5O₂ → 4H₂O + 4CO₂
* (4 Carbon, 8 Hydrogen, 12 Oxygen on both sides)
20. 16Al + 3S₈ → 8Al₂S₃
* (16 Aluminum, 24 Sulfur on both sides)

***

Part 2: Types of Reaction

Here are the 5 main types of reactions usually taught in chemistry class:

1. Synthesis (Two things combine to make one new thing: A + B → AB)
2. Decomposition (One thing breaks apart into two or more things: AB → A + B)
3. Single Replacement (One element swaps places with another in a compound: A + BC → AC + B)
4. Double Replacement (Two compounds swap partners: AB + CD → AD + CB)
5. Combustion (Something burns with Oxygen to make CO₂ and H₂O)

***

Part 3: Identifying the Reaction Types

Here is which type applies to each of the 20 equations above:

1. Single Replacement (Zinc replaces Silver)
2. Synthesis (Nitrogen and Hydrogen combine)
3. Double Replacement (Sodium and Silver swap partners)
4. Double Replacement (Acid-Base neutralization)
5. Single Replacement (Nickel replaces Hydrogen)
6. Decomposition (One compound breaks into three)
7. Double Replacement (Barium and Sodium swap partners)
8. Decomposition (One compound breaks into two)
9. Single Replacement (Calcium replaces Hydrogen)
10. Decomposition (One compound breaks into three)
11. Synthesis (Nitrogen and Oxygen combine)
12. Double Replacement (Magnesium and Potassium swap partners)
13. Single Replacement (Manganese replaces Copper)
14. Synthesis (Zinc and Sulfur combine)
15. Double Replacement (Acid-Base neutralization)
16. Single Replacement (Potassium replaces Hydrogen)
17. Combustion (Hydrocarbon burns with Oxygen)
18. Double Replacement (Acid-Base neutralization)
19. Combustion (Organic compound burns with Oxygen)
20. Synthesis (Aluminum and Sulfur combine)