Writing Chemical Formulas Worksheet Answer Key Or Worksheets 46 Re ... - Free Printable

This worksheet involves naming ionic compounds and writing their chemical formulas. Below is a detailed explanation of how to approach this task, followed by the solutions for all the compounds listed.

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Key Rules for Naming Ionic Compounds

1. Metal + Nonmetal:
- The metal is named first (using its element name).
- The nonmetal is named second with an "-ide" suffix.
- If the metal can form multiple ions (e.g., iron), use Roman numerals to specify the charge.

2. Polyatomic Ions:
- Polyatomic ions have specific names (e.g., nitrate, sulfate, hydroxide).
- Use the full name of the polyatomic ion.

3. Transition Metals:
- Transition metals that form multiple ions require Roman numerals to indicate the charge (e.g., Iron(III) = Fe³⁺).

4. Ammonium Ion:
- Ammonium is always NH₄⁺ and is treated as a cation.

5. Acids and Hydroxides:
- Acids are named based on the anion (e.g., HCl → hydrochloric acid).
- Hydroxides are named as "hydroxide" with the metal's name before it.

6. Formula Writing:
- Balance the charges of the cations and anions to ensure electrical neutrality.
- Use subscripts to indicate the number of each ion present.

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Solutions

#### Section 1: Naming Compounds from Formulas
1. NaNO₃: Sodium nitrate
2. CaCO₃: Calcium carbonate
3. MgO: Magnesium oxide
4. NH₄S: Ammonium sulfide
5. PbSO₄: Lead(II) sulfate
6. NaCN: Sodium cyanide
7. KOH: Potassium hydroxide
8. AgCl: Silver chloride
9. Fe(OH)₃: Iron(III) hydroxide
10. KOH: Potassium hydroxide
11. Sn(ClO₄)₂: Tin(IV) perchlorate
12. K₂CO₃: Potassium carbonate
13. AgNO₃: Silver nitrate
14. NaI: Sodium iodide
15. NH₄OH: Ammonium hydroxide
16. KIO₄: Potassium iodate
17. PbO₂: Lead(IV) oxide
18. NH₄OH: Ammonium hydroxide
19. BaSO₄: Barium sulfate
20. BaCl₂: Barium chloride
21. CoCl₂: Cobalt(II) chloride
22. Na₂CO₃: Sodium carbonate
23. CaO: Calcium oxide
24. Pb(NO₃)₂: Lead(II) nitrate
25. SnCl₂: Tin(II) chloride

#### Section 2: Writing Formulas from Names
26. Aluminum chloride: AlCl₃
27. Iron(III) hydroxide: Fe(OH)₃
28. Sodium acetate: NaC₂H₃O₂
29. Calcium hydroxide: Ca(OH)₂
30. Sodium iodate: NaIO₃
31. Nickel(II) nitrate: Ni(NO₃)₂
32. Iron(II) chloride: FeCl₂
33. Magnesium bromide: MgBr₂
34. Ammonium nitrate: NH₄NO₃
35. Silver bromide: AgBr
36. Al(OH)₃: Aluminum hydroxide
37. NH₄I: Ammonium iodide
38. Li₂CO₃: Lithium carbonate
39. CuSO₄: Copper(II) sulfate
40. KCN: Potassium cyanide
41. Pb(ClO₃)₂: Lead(II) chlorate
42. BaS: Barium sulfide
43. ZnSO₄: Zinc sulfate
44. Pb(CH₃COO)₂: Lead(II) acetate
45. Ca(NO₃)₂: Calcium nitrate
46. Fe₂(CO₃)₃: Iron(III) carbonate
47. NH₄IO₃: Ammonium iodate
48. CaCl₂: Calcium chloride
49. NaF: Sodium fluoride
50. Cu(NO₃)₂: Copper(II) nitrate

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Final Answer

The completed worksheet would look like this:

| Number | Name or Formula | Formula or Name |
|--------|--------------------------|-------------------------|
| 1 | Sodium nitrate | NaNO₃ |
| 2 | Calcium carbonate | CaCO₃ |
| 3 | Magnesium oxide | MgO |
| 4 | Ammonium sulfide | NH₄S |
| 5 | Lead(II) sulfate | PbSO₄ |
| 6 | Sodium cyanide | NaCN |
| 7 | Potassium hydroxide | KOH |
| 8 | Silver chloride | AgCl |
| 9 | Iron(III) hydroxide | Fe(OH)₃ |
| 10 | Potassium hydroxide | KOH |
| 11 | Tin(IV) perchlorate | Sn(ClO₄)₂ |
| 12 | Potassium carbonate | K₂CO₃ |
| 13 | Silver nitrate | AgNO₃ |
| 14 | Sodium iodide | NaI |
| 15 | Ammonium hydroxide | NH₄OH |
| 16 | Potassium iodate | KIO₄ |
| 17 | Lead(IV) oxide | PbO₂ |
| 18 | Ammonium hydroxide | NH₄OH |
| 19 | Barium sulfate | BaSO₄ |
| 20 | Barium chloride | BaCl₂ |
| 21 | Cobalt(II) chloride | CoCl₂ |
| 22 | Sodium carbonate | Na₂CO₃ |
| 23 | Calcium oxide | CaO |
| 24 | Lead(II) nitrate | Pb(NO₃)₂ |
| 25 | Tin(II) chloride | SnCl₂ |
| 26 | Aluminum chloride | AlCl₃ |
| 27 | Iron(III) hydroxide | Fe(OH)₃ |
| 28 | Sodium acetate | NaC₂H₃O₂ |
| 29 | Calcium hydroxide | Ca(OH)₂ |
| 30 | Sodium iodate | NaIO₃ |
| 31 | Nickel(II) nitrate | Ni(NO₃)₂ |
| 32 | Iron(II) chloride | FeCl₂ |
| 33 | Magnesium bromide | MgBr₂ |
| 34 | Ammonium nitrate | NH₄NO₃ |
| 35 | Silver bromide | AgBr |
| 36 | Al(OH)₃ | Aluminum hydroxide |
| 37 | NH₄I | Ammonium iodide |
| 38 | Li₂CO₃ | Lithium carbonate |
| 39 | CuSO₄ | Copper(II) sulfate |
| 40 | KCN | Potassium cyanide |
| 41 | Pb(ClO₃)₂ | Lead(II) chlorate |
| 42 | BaS | Barium sulfide |
| 43 | ZnSO₄ | Zinc sulfate |
| 44 | Pb(CH₃COO)₂ | Lead(II) acetate |
| 45 | Ca(NO₃)₂ | Calcium nitrate |
| 46 | Fe₂(CO₃)₃ | Iron(III) carbonate |
| 47 | NH₄IO₃ | Ammonium iodate |
| 48 | CaCl₂ | Calcium chloride |
| 49 | NaF | Sodium fluoride |
| 50 | Cu(NO₃)₂ | Copper(II) nitrate |

Boxed Final Answer:
\boxed{\text{See above table for completed worksheet.}}