Let's solve this
"Types of Chemical Reactions Worksheet" step by step. The goal is to write correct chemical formulas for ionic compounds, metal oxides, and bases (hydroxides), using the
criss-cross method as described in the instructions.
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🔧 Rules Recap:
- Use
criss-cross method: swap the numerical values of the charges (ignoring signs) to become subscripts.
-
Simplify subscripts if possible (e.g., Ca₂O₂ → CaO).
- For
polyatomic ions, use parentheses when more than one is needed.
-
Hydroxide ion = OH⁻
-
Oxide ion = O²⁻
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##
✔ Part 1: Write formulas for ionic compounds (salts)
| Compound | Formula |
|--------|--------|
| 1. Magnesium fluoride | MgF₂ |
| 2. Calcium nitride | Ca₃N₂ |
| 3. Aluminum iodide | AlI₃ |
| 4. Sodium chloride | NaCl |
| 5. Copper(I) sulfide | Cu₂S |
| 6. Iron(II) sulfate | FeSO₄ |
| 7. Barium nitrate | Ba(NO₃)₂ |
| 8. Potassium phosphate | K₃PO₄ |
| 9. Cobalt(II) chlorate | Co(ClO₃)₂ |
| 10. Zinc carbonate | ZnCO₃ |
📝 Explanation:
1.
Mg²⁺ + F⁻ → Criss-cross: Mg₁F₂ →
MgF₂
2.
Ca²⁺ + N³⁻ → Ca₃N₂
3.
Al³⁺ + I⁻ → AlI₃
4.
Na⁺ + Cl⁻ → NaCl
5.
Cu⁺ + S²⁻ → Cu₂S (two Cu⁺ needed to balance S²⁻)
6.
Fe²⁺ + SO₄²⁻ → FeSO₄ (charges cancel directly)
7.
Ba²⁺ + NO₃⁻ → Ba(NO₃)₂ (use parentheses for polyatomic ion)
8.
K⁺ + PO₄³⁻ → K₃PO₄
9.
Co²⁺ + ClO₃⁻ → Co(ClO₃)₂
10.
Zn²⁺ + CO₃²⁻ → ZnCO₃
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##
✔ Part 2: Write formulas for basic oxides (metal oxides)
| Compound | Formula |
|--------|--------|
| 1. Lithium oxide | Li₂O |
| 2. Magnesium oxide | MgO |
| 3. Barium oxide | BaO |
| 4. Potassium oxide | K₂O |
| 5. Cesium oxide | Cs₂O |
| 6. Iron(III) oxide | Fe₂O₃ |
| 7. Silver oxide | Ag₂O |
| 8. Nickel(II) oxide | NiO |
| 9. Tin(IV) oxide | SnO₂ |
| 10. Copper(I) oxide | Cu₂O |
📝 Explanation:
- All involve
O²⁻.
- Metal charge determines subscript.
1.
Li⁺ + O²⁻ → Li₂O
2.
Mg²⁺ + O²⁻ → MgO
3.
Ba²⁺ + O²⁻ → BaO
4.
K⁺ + O²⁻ → K₂O
5.
Cs⁺ + O²⁻ → Cs₂O
6.
Fe³⁺ + O²⁻ → Fe₂O₃ (criss-cross: 3 and 2 → Fe₂O₃)
7.
Ag⁺ + O²⁻ → Ag₂O
8.
Ni²⁺ + O²⁻ → NiO
9.
Sn⁴⁺ + O²⁻ → SnO₂
10.
Cu⁺ + O²⁻ → Cu₂O
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##
✔ Part 3: Write formulas for bases (end in hydroxide)
| Compound | Formula |
|--------|--------|
| 1. Lithium hydroxide | LiOH |
| 2. Barium hydroxide | Ba(OH)₂ |
| 3. Aluminum hydroxide | Al(OH)₃ |
| 4. Potassium hydroxide | KOH |
| 5. Copper(II) hydroxide | Cu(OH)₂ |
| 6. Lead(II) hydroxide | Pb(OH)₂ |
| 7. Zinc hydroxide | Zn(OH)₂ |
| 8. Calcium hydroxide | Ca(OH)₂ |
| 9. Copper(I) hydroxide | CuOH |
| 10. Magnesium hydroxide | Mg(OH)₂ |
📝 Explanation:
- Hydroxide ion =
OH⁻
- Use criss-cross with metal cation charge.
1.
Li⁺ + OH⁻ → LiOH
2.
Ba²⁺ + OH⁻ → Ba(OH)₂ (parentheses because two OH groups)
3.
Al³⁺ + OH⁻ → Al(OH)₃
4.
K⁺ + OH⁻ → KOH
5.
Cu²⁺ + OH⁻ → Cu(OH)₂
6.
Pb²⁺ + OH⁻ → Pb(OH)₂
7.
Zn²⁺ + OH⁻ → Zn(OH)₂
8.
Ca²⁺ + OH⁻ → Ca(OH)₂
9.
Cu⁺ + OH⁻ → CuOH (only one OH needed)
10.
Mg²⁺ + OH⁻ → Mg(OH)₂
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✔ Final Answer Summary:
#### Ionic Compounds:
1. MgF₂
2. Ca₃N₂
3. AlI₃
4. NaCl
5. Cu₂S
6. FeSO₄
7. Ba(NO₃)₂
8. K₃PO₄
9. Co(ClO₃)₂
10. ZnCO₃
#### Metal Oxides:
1. Li₂O
2. MgO
3. BaO
4. K₂O
5. Cs₂O
6. Fe₂O₃
7. Ag₂O
8. NiO
9. SnO₂
10. Cu₂O
#### Bases:
1. LiOH
2. Ba(OH)₂
3. Al(OH)₃
4. KOH
5. Cu(OH)₂
6. Pb(OH)₂
7. Zn(OH)₂
8. Ca(OH)₂
9. CuOH
10. Mg(OH)₂
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Parent Tip: Review the logic above to help your child master the concept of types of chemical reactions worksheet.
