Free balancing equations worksheet | GCSE chemistry | Teachit - Free Printable
Educational worksheet: Free balancing equations worksheet | GCSE chemistry | Teachit. Download and print for classroom or home learning activities.
JPEG
1239×1754
121.9 KB
Free · Personal Use
Quality Assured by Worksheets Library Team
Reviewed for educational accuracy and age-appropriateness
ID: #1522825
⭐
Show Answer Key & Explanations
Step-by-step solution for: Free balancing equations worksheet | GCSE chemistry | Teachit
▼
Show Answer Key & Explanations
Step-by-step solution for: Free balancing equations worksheet | GCSE chemistry | Teachit
Here is the balanced version of each chemical equation from your worksheet, along with a step-by-step explanation for each.
---
✔ Already balanced!
- Left: 1 C, 2 O
- Right: 1 C, 2 O
Balanced Equation:
C + O₂ → CO₂
---
Not balanced.
Left: 2 H, 2 O
Right: 2 H, 1 O → Oxygen is unbalanced.
To balance oxygen, put a 2 in front of H₂O → gives 2 O and 4 H on right.
Now need 4 H on left → put 2 in front of H₂.
Balanced Equation:
2H₂ + O₂ → 2H₂O
✔️ Left: 4 H, 2 O
✔️ Right: 4 H, 2 O
---
Left: 1 Na, 2 H, 1 O
Right: 1 Na, 1 O, 1 H (from NaOH) + 2 H (from H₂) = 3 H total → Hydrogen unbalanced.
Try putting 2 in front of Na and 2 in front of NaOH:
→ 2Na + H₂O → 2NaOH + H₂
Now check atoms:
Left: 2 Na, 2 H, 1 O
Right: 2 Na, 2 O, 4 H → still unbalanced.
We need to adjust H₂O too. Try 2H₂O:
→ 2Na + 2H₂O → 2NaOH + H₂
Left: 2 Na, 4 H, 2 O
Right: 2 Na, 2 O, 2 H (from NaOH) + 2 H (from H₂) = 4 H → Balanced!
Balanced Equation:
2Na + 2H₂O → 2NaOH + H₂
---
Left: 1 Na, 2 O
Right: 2 Na, 1 O → both Na and O unbalanced.
Balance O first: Na₂O has 1 O, O₂ has 2 O → need 2 Na₂O to get 2 O.
→ Na + O₂ → 2Na₂O
Now right has 4 Na → need 4 Na on left.
Balanced Equation:
4Na + O₂ → 2Na₂O
✔️ Left: 4 Na, 2 O
✔️ Right: 4 Na, 2 O
---
Left: 1 Na, 2 Cl
Right: 1 Na, 1 Cl → Chlorine unbalanced.
Put 2 in front of NaCl → 2 Na, 2 Cl on right → need 2 Na on left.
Balanced Equation:
2Na + Cl₂ → 2NaCl
✔️ Left: 2 Na, 2 Cl
✔️ Right: 2 Na, 2 Cl
---
Check atoms:
Left: 1 Na, 1 O, 1 H (from NaOH) + 1 H, 1 Cl (from HCl) = 2 H total
Right: 1 Na, 1 Cl, 2 H, 1 O
All atoms equal!
✔ Already balanced.
Balanced Equation:
NaOH + HCl → NaCl + H₂O
---
Left: 1 Na, 1 O, 1 H (NaOH) + 1 H, 1 N, 3 O (HNO₃) → Total: 1 Na, 1 N, 4 O, 2 H
Right: 1 Na, 1 N, 3 O (NaNO₃) + 2 H, 1 O (H₂O) → Total: 1 Na, 1 N, 4 O, 2 H
✔ Already balanced!
Balanced Equation:
NaOH + HNO₃ → NaNO₃ + H₂O
---
Left: 1 Na, 1 O, 1 H (NaOH) + 2 H, 1 S, 4 O (H₂SO₄) → Total: 1 Na, 1 S, 5 O, 3 H
Right: 2 Na, 1 S, 4 O (Na₂SO₄) + 2 H, 1 O (H₂O) → Total: 2 Na, 1 S, 5 O, 2 H
Unbalanced: Na (1 vs 2), H (3 vs 2)
Put 2 in front of NaOH → now 2 Na, 2 O, 2 H from NaOH + 2 H, 1 S, 4 O from H₂SO₄ → Total: 2 Na, 1 S, 6 O, 4 H
Right: Na₂SO₄ (2 Na, 1 S, 4 O) + H₂O → need 2 H₂O to get 4 H and 2 O → total right: 2 Na, 1 S, 6 O, 4 H
Perfect!
Balanced Equation:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
---
Left: 2 Na, 1 C, 3 O, 1 H, 1 Cl
Right: 1 Na, 1 Cl (NaCl) + 2 H, 1 O (H₂O) + 1 C, 2 O (CO₂) → Total: 1 Na, 1 C, 3 O, 2 H, 1 Cl
Unbalanced: Na (2 vs 1), H (1 vs 2)
Put 2 in front of HCl → now left: 2 Na, 1 C, 3 O, 2 H, 2 Cl
Right: need 2 NaCl → 2 Na, 2 Cl → then H₂O and CO₂ stay as is → H: 2, O: 3, C:1
Perfect!
Balanced Equation:
Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂
✔️ Left: 2 Na, 1 C, 3 O, 2 H, 2 Cl
✔️ Right: 2 Na, 2 Cl, 2 H, 1 O (H₂O) + 1 C, 2 O (CO₂) = 2 Na, 1 C, 3 O, 2 H, 2 Cl
---
Left: 1 Na, 1 O, 1 H (NaOH) + 1 C, 2 O (CO₂) → Total: 1 Na, 1 C, 3 O, 1 H
Right: 2 Na, 1 C, 3 O (Na₂CO₃) + 2 H, 1 O (H₂O) → Total: 2 Na, 1 C, 4 O, 2 H
Unbalanced: Na (1 vs 2), H (1 vs 2), O (3 vs 4)
Put 2 in front of NaOH → left: 2 Na, 2 O, 2 H (from NaOH) + 1 C, 2 O (CO₂) → Total: 2 Na, 1 C, 4 O, 2 H
Right: Na₂CO₃ (2 Na, 1 C, 3 O) + H₂O (2 H, 1 O) → Total: 2 Na, 1 C, 4 O, 2 H → Balanced!
Balanced Equation:
2NaOH + CO₂ → Na₂CO₃ + H₂O
---
## ✔ Final Answer — All Balanced Equations:
1. C + O₂ → CO₂
2. 2H₂ + O₂ → 2H₂O
3. 2Na + 2H₂O → 2NaOH + H₂
4. 4Na + O₂ → 2Na₂O
5. 2Na + Cl₂ → 2NaCl
6. NaOH + HCl → NaCl + H₂O
7. NaOH + HNO₃ → NaNO₃ + H₂O
8. 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
9. Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂
10. 2NaOH + CO₂ → Na₂CO₃ + H₂O
---
Let me know if you’d like a printable version or practice quiz based on this! 🧪📚
---
🔢 1. C + O₂ → CO₂
✔ Already balanced!
- Left: 1 C, 2 O
- Right: 1 C, 2 O
Balanced Equation:
C + O₂ → CO₂
---
🔢 2. H₂ + O₂ → H₂O
Not balanced.
Left: 2 H, 2 O
Right: 2 H, 1 O → Oxygen is unbalanced.
To balance oxygen, put a 2 in front of H₂O → gives 2 O and 4 H on right.
Now need 4 H on left → put 2 in front of H₂.
Balanced Equation:
2H₂ + O₂ → 2H₂O
✔️ Left: 4 H, 2 O
✔️ Right: 4 H, 2 O
---
🔢 3. Na + H₂O → NaOH + H₂
Left: 1 Na, 2 H, 1 O
Right: 1 Na, 1 O, 1 H (from NaOH) + 2 H (from H₂) = 3 H total → Hydrogen unbalanced.
Try putting 2 in front of Na and 2 in front of NaOH:
→ 2Na + H₂O → 2NaOH + H₂
Now check atoms:
Left: 2 Na, 2 H, 1 O
Right: 2 Na, 2 O, 4 H → still unbalanced.
We need to adjust H₂O too. Try 2H₂O:
→ 2Na + 2H₂O → 2NaOH + H₂
Left: 2 Na, 4 H, 2 O
Right: 2 Na, 2 O, 2 H (from NaOH) + 2 H (from H₂) = 4 H → Balanced!
Balanced Equation:
2Na + 2H₂O → 2NaOH + H₂
---
🔢 4. Na + O₂ → Na₂O
Left: 1 Na, 2 O
Right: 2 Na, 1 O → both Na and O unbalanced.
Balance O first: Na₂O has 1 O, O₂ has 2 O → need 2 Na₂O to get 2 O.
→ Na + O₂ → 2Na₂O
Now right has 4 Na → need 4 Na on left.
Balanced Equation:
4Na + O₂ → 2Na₂O
✔️ Left: 4 Na, 2 O
✔️ Right: 4 Na, 2 O
---
🔢 5. Na + Cl₂ → NaCl
Left: 1 Na, 2 Cl
Right: 1 Na, 1 Cl → Chlorine unbalanced.
Put 2 in front of NaCl → 2 Na, 2 Cl on right → need 2 Na on left.
Balanced Equation:
2Na + Cl₂ → 2NaCl
✔️ Left: 2 Na, 2 Cl
✔️ Right: 2 Na, 2 Cl
---
🔢 6. NaOH + HCl → NaCl + H₂O
Check atoms:
Left: 1 Na, 1 O, 1 H (from NaOH) + 1 H, 1 Cl (from HCl) = 2 H total
Right: 1 Na, 1 Cl, 2 H, 1 O
All atoms equal!
✔ Already balanced.
Balanced Equation:
NaOH + HCl → NaCl + H₂O
---
🔢 7. NaOH + HNO₃ → NaNO₃ + H₂O
Left: 1 Na, 1 O, 1 H (NaOH) + 1 H, 1 N, 3 O (HNO₃) → Total: 1 Na, 1 N, 4 O, 2 H
Right: 1 Na, 1 N, 3 O (NaNO₃) + 2 H, 1 O (H₂O) → Total: 1 Na, 1 N, 4 O, 2 H
✔ Already balanced!
Balanced Equation:
NaOH + HNO₃ → NaNO₃ + H₂O
---
🔢 8. NaOH + H₂SO₄ → Na₂SO₄ + H₂O
Left: 1 Na, 1 O, 1 H (NaOH) + 2 H, 1 S, 4 O (H₂SO₄) → Total: 1 Na, 1 S, 5 O, 3 H
Right: 2 Na, 1 S, 4 O (Na₂SO₄) + 2 H, 1 O (H₂O) → Total: 2 Na, 1 S, 5 O, 2 H
Unbalanced: Na (1 vs 2), H (3 vs 2)
Put 2 in front of NaOH → now 2 Na, 2 O, 2 H from NaOH + 2 H, 1 S, 4 O from H₂SO₄ → Total: 2 Na, 1 S, 6 O, 4 H
Right: Na₂SO₄ (2 Na, 1 S, 4 O) + H₂O → need 2 H₂O to get 4 H and 2 O → total right: 2 Na, 1 S, 6 O, 4 H
Perfect!
Balanced Equation:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
---
🔢 9. Na₂CO₃ + HCl → NaCl + H₂O + CO₂
Left: 2 Na, 1 C, 3 O, 1 H, 1 Cl
Right: 1 Na, 1 Cl (NaCl) + 2 H, 1 O (H₂O) + 1 C, 2 O (CO₂) → Total: 1 Na, 1 C, 3 O, 2 H, 1 Cl
Unbalanced: Na (2 vs 1), H (1 vs 2)
Put 2 in front of HCl → now left: 2 Na, 1 C, 3 O, 2 H, 2 Cl
Right: need 2 NaCl → 2 Na, 2 Cl → then H₂O and CO₂ stay as is → H: 2, O: 3, C:1
Perfect!
Balanced Equation:
Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂
✔️ Left: 2 Na, 1 C, 3 O, 2 H, 2 Cl
✔️ Right: 2 Na, 2 Cl, 2 H, 1 O (H₂O) + 1 C, 2 O (CO₂) = 2 Na, 1 C, 3 O, 2 H, 2 Cl
---
🔢 10. NaOH + CO₂ → Na₂CO₃ + H₂O
Left: 1 Na, 1 O, 1 H (NaOH) + 1 C, 2 O (CO₂) → Total: 1 Na, 1 C, 3 O, 1 H
Right: 2 Na, 1 C, 3 O (Na₂CO₃) + 2 H, 1 O (H₂O) → Total: 2 Na, 1 C, 4 O, 2 H
Unbalanced: Na (1 vs 2), H (1 vs 2), O (3 vs 4)
Put 2 in front of NaOH → left: 2 Na, 2 O, 2 H (from NaOH) + 1 C, 2 O (CO₂) → Total: 2 Na, 1 C, 4 O, 2 H
Right: Na₂CO₃ (2 Na, 1 C, 3 O) + H₂O (2 H, 1 O) → Total: 2 Na, 1 C, 4 O, 2 H → Balanced!
Balanced Equation:
2NaOH + CO₂ → Na₂CO₃ + H₂O
---
## ✔ Final Answer — All Balanced Equations:
1. C + O₂ → CO₂
2. 2H₂ + O₂ → 2H₂O
3. 2Na + 2H₂O → 2NaOH + H₂
4. 4Na + O₂ → 2Na₂O
5. 2Na + Cl₂ → 2NaCl
6. NaOH + HCl → NaCl + H₂O
7. NaOH + HNO₃ → NaNO₃ + H₂O
8. 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
9. Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂
10. 2NaOH + CO₂ → Na₂CO₃ + H₂O
---
Let me know if you’d like a printable version or practice quiz based on this! 🧪📚
Parent Tip: Review the logic above to help your child master the concept of balancing equations easy worksheet.
