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Step-by-step solution for: Predicting Products of Chemical Reactions-1.pdf - Predicting ...
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Step-by-step solution for: Predicting Products of Chemical Reactions-1.pdf - Predicting ...
Let’s go through each reaction one by one. We’ll predict the products based on common chemical reaction patterns — like single replacement, double replacement, decomposition, synthesis, and combustion.
We’ll also check if the reactions are balanced (same number of each atom on both sides). If not, we’ll balance them.
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1. Fe + O₂ → ?
Iron reacts with oxygen to form iron(III) oxide (rust).
Unbalanced:
Fe + O₂ → Fe₂O₃
Balance it:
4Fe + 3O₂ → 2Fe₂O₃ ✔
---
2. Ca + H₂O → ?
Calcium is a reactive metal. It reacts with water to make calcium hydroxide and hydrogen gas.
Ca + 2H₂O → Ca(OH)₂ + H₂ ✔
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3. NaCl + AgNO₃ → ?
This is a double replacement reaction. Sodium swaps with silver.
NaCl + AgNO₃ → AgCl + NaNO₃
AgCl is insoluble (precipitate), so this reaction happens.
Already balanced ✔
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4. Mg + HCl → ?
Magnesium replaces hydrogen in acid.
Mg + 2HCl → MgCl₂ + H₂ ✔
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5. CuSO₄ + Zn → ?
Zinc is more reactive than copper, so it displaces copper.
CuSO₄ + Zn → ZnSO₄ + Cu ✔
---
6. KBr + Cl₂ → ?
Chlorine is more reactive than bromine, so it displaces bromine.
2KBr + Cl₂ → 2KCl + Br₂ ✔
---
7. Al + O₂ → ?
Aluminum burns in air to form aluminum oxide.
4Al + 3O₂ → 2Al₂O₃ ✔
---
8. Pb(NO₃)₂ + KI → ?
Double replacement. Lead iodide is yellow precipitate.
Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃ ✔
---
9. CH₄ + O₂ → ?
Combustion of methane. Makes CO₂ and H₂O.
CH₄ + 2O₂ → CO₂ + 2H₂O ✔
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10. NaOH + HCl → ?
Acid-base neutralization. Makes salt and water.
NaOH + HCl → NaCl + H₂O ✔
---
11. Fe₂O₃ + CO → ?
Reduction of iron ore. Makes iron and carbon dioxide.
Fe₂O₃ + 3CO → 2Fe + 3CO₂ ✔
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12. NH₃ + O₂ → ?
Ammonia burns in oxygen to make nitrogen monoxide and water (catalytic oxidation).
4NH₃ + 5O₂ → 4NO + 6H₂O ✔
*(Note: Sometimes it makes N₂, but for standard prediction, NO is accepted with catalyst.)*
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13. CaCO₃ → ?
Decomposition when heated.
CaCO₃ → CaO + CO₂ ✔
---
14. SO₂ + O₂ → ?
Sulfur dioxide oxidizes to sulfur trioxide (needs catalyst).
2SO₂ + O₂ → 2SO₃ ✔
---
15. C₂H₅OH + O₂ → ?
Ethanol combustion.
C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O ✔
---
16. BaCl₂ + Na₂SO₄ → ?
Double replacement. Barium sulfate is insoluble.
BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl ✔
---
17. Zn + CuSO₄ → ?
Same as #5 — zinc displaces copper.
Zn + CuSO₄ → ZnSO₄ + Cu ✔
---
18. H₂ + Cl₂ → ?
Synthesis of hydrogen chloride.
H₂ + Cl₂ → 2HCl ✔
---
19. Na + H₂O → ?
Very vigorous reaction. Makes sodium hydroxide and hydrogen.
2Na + 2H₂O → 2NaOH + H₂ ✔
---
20. CO₂ + H₂O → ?
Forms carbonic acid (weak acid).
CO₂ + H₂O → H₂CO₃ ✔
---
All reactions are now predicted and balanced.
Final Answer:
1. 4Fe + 3O₂ → 2Fe₂O₃
2. Ca + 2H₂O → Ca(OH)₂ + H₂
3. NaCl + AgNO₃ → AgCl + NaNO₃
4. Mg + 2HCl → MgCl₂ + H₂
5. CuSO₄ + Zn → ZnSO₄ + Cu
6. 2KBr + Cl₂ → 2KCl + Br₂
7. 4Al + 3O₂ → 2Al₂O₃
8. Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃
9. CH₄ + 2O₂ → CO₂ + 2H₂O
10. NaOH + HCl → NaCl + H₂O
11. Fe₂O₃ + 3CO → 2Fe + 3CO₂
12. 4NH₃ + 5O₂ → 4NO + 6H₂O
13. CaCO₃ → CaO + CO₂
14. 2SO₂ + O₂ → 2SO₃
15. C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
16. BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl
17. Zn + CuSO₄ → ZnSO₄ + Cu
18. H₂ + Cl₂ → 2HCl
19. 2Na + 2H₂O → 2NaOH + H₂
20. CO₂ + H₂O → H₂CO₃
We’ll also check if the reactions are balanced (same number of each atom on both sides). If not, we’ll balance them.
---
1. Fe + O₂ → ?
Iron reacts with oxygen to form iron(III) oxide (rust).
Unbalanced:
Fe + O₂ → Fe₂O₃
Balance it:
4Fe + 3O₂ → 2Fe₂O₃ ✔
---
2. Ca + H₂O → ?
Calcium is a reactive metal. It reacts with water to make calcium hydroxide and hydrogen gas.
Ca + 2H₂O → Ca(OH)₂ + H₂ ✔
---
3. NaCl + AgNO₃ → ?
This is a double replacement reaction. Sodium swaps with silver.
NaCl + AgNO₃ → AgCl + NaNO₃
AgCl is insoluble (precipitate), so this reaction happens.
Already balanced ✔
---
4. Mg + HCl → ?
Magnesium replaces hydrogen in acid.
Mg + 2HCl → MgCl₂ + H₂ ✔
---
5. CuSO₄ + Zn → ?
Zinc is more reactive than copper, so it displaces copper.
CuSO₄ + Zn → ZnSO₄ + Cu ✔
---
6. KBr + Cl₂ → ?
Chlorine is more reactive than bromine, so it displaces bromine.
2KBr + Cl₂ → 2KCl + Br₂ ✔
---
7. Al + O₂ → ?
Aluminum burns in air to form aluminum oxide.
4Al + 3O₂ → 2Al₂O₃ ✔
---
8. Pb(NO₃)₂ + KI → ?
Double replacement. Lead iodide is yellow precipitate.
Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃ ✔
---
9. CH₄ + O₂ → ?
Combustion of methane. Makes CO₂ and H₂O.
CH₄ + 2O₂ → CO₂ + 2H₂O ✔
---
10. NaOH + HCl → ?
Acid-base neutralization. Makes salt and water.
NaOH + HCl → NaCl + H₂O ✔
---
11. Fe₂O₃ + CO → ?
Reduction of iron ore. Makes iron and carbon dioxide.
Fe₂O₃ + 3CO → 2Fe + 3CO₂ ✔
---
12. NH₃ + O₂ → ?
Ammonia burns in oxygen to make nitrogen monoxide and water (catalytic oxidation).
4NH₃ + 5O₂ → 4NO + 6H₂O ✔
*(Note: Sometimes it makes N₂, but for standard prediction, NO is accepted with catalyst.)*
---
13. CaCO₃ → ?
Decomposition when heated.
CaCO₃ → CaO + CO₂ ✔
---
14. SO₂ + O₂ → ?
Sulfur dioxide oxidizes to sulfur trioxide (needs catalyst).
2SO₂ + O₂ → 2SO₃ ✔
---
15. C₂H₅OH + O₂ → ?
Ethanol combustion.
C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O ✔
---
16. BaCl₂ + Na₂SO₄ → ?
Double replacement. Barium sulfate is insoluble.
BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl ✔
---
17. Zn + CuSO₄ → ?
Same as #5 — zinc displaces copper.
Zn + CuSO₄ → ZnSO₄ + Cu ✔
---
18. H₂ + Cl₂ → ?
Synthesis of hydrogen chloride.
H₂ + Cl₂ → 2HCl ✔
---
19. Na + H₂O → ?
Very vigorous reaction. Makes sodium hydroxide and hydrogen.
2Na + 2H₂O → 2NaOH + H₂ ✔
---
20. CO₂ + H₂O → ?
Forms carbonic acid (weak acid).
CO₂ + H₂O → H₂CO₃ ✔
---
All reactions are now predicted and balanced.
Final Answer:
1. 4Fe + 3O₂ → 2Fe₂O₃
2. Ca + 2H₂O → Ca(OH)₂ + H₂
3. NaCl + AgNO₃ → AgCl + NaNO₃
4. Mg + 2HCl → MgCl₂ + H₂
5. CuSO₄ + Zn → ZnSO₄ + Cu
6. 2KBr + Cl₂ → 2KCl + Br₂
7. 4Al + 3O₂ → 2Al₂O₃
8. Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃
9. CH₄ + 2O₂ → CO₂ + 2H₂O
10. NaOH + HCl → NaCl + H₂O
11. Fe₂O₃ + 3CO → 2Fe + 3CO₂
12. 4NH₃ + 5O₂ → 4NO + 6H₂O
13. CaCO₃ → CaO + CO₂
14. 2SO₂ + O₂ → 2SO₃
15. C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
16. BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl
17. Zn + CuSO₄ → ZnSO₄ + Cu
18. H₂ + Cl₂ → 2HCl
19. 2Na + 2H₂O → 2NaOH + H₂
20. CO₂ + H₂O → H₂CO₃
Parent Tip: Review the logic above to help your child master the concept of predicting products worksheet with answers.
