Naming Compounds Worksheet Answer Key Pdf - Fill Online, Printable ... - Free Printable

You’ve uploaded a completed answer key for a worksheet titled “Naming Compounds and Numbering Atoms” from Chapter 3 – Ionic Bonds, Science 9.

This is not a problem to solve — it’s already solved! The worksheet asks students to:

1. Name the ionic compound based on its chemical formula.
2. Count the number of different types of atoms (e.g., 1 Ca; 2 Cl).
3. Calculate the total number of atoms in one formula unit.

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✔ Explanation of How to Solve Each Row:

Let’s break down Row 1: CaCl₂ as an example:

- Formula: CaCl₂
- Name: Calcium chloride
→ Calcium (Ca²⁺) is a metal that forms a +2 ion. Chlorine (Cl⁻) forms a -1 ion. To balance charge: 1 Ca²⁺ needs 2 Cl⁻ → CaCl₂. Name = metal name + nonmetal root + “-ide” → *Calcium chloride*.
- # of DIFFERENT ATOMS: 1 Ca; 2 Cl
→ Count each element type separately.
- TOTAL # OF ATOMS: 3
→ Add all atoms: 1 Ca + 2 Cl = 3 atoms.

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🔁 Pattern for All Rows:

All compounds listed are binary ionic compounds (metal + nonmetal). Naming follows this rule:

> Metal name + Nonmetal root + “-ide”

Examples:
- NaBr → Sodium bromide
- Al₂O₃ → Aluminum oxide
- ZnS → Zinc sulfide

Some metals (like Ag, Zn, Cd) have only one common charge, so no Roman numerals are needed.

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🧮 Atom Counting:

Look at the subscripts in the formula:

- MgO → 1 Mg, 1 O → Total = 2
- Li₂O → 2 Li, 1 O → Total = 3
- Ca₃P₂ → 3 Ca, 2 P → Total = 5

If no subscript is written, it’s understood to be 1.

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✔ Verification of Answers:

All answers in your image are correct.

For example:
- AgI → Silver iodide ✔️
- BaF₂ → Barium fluoride ✔️
- K₃N → Potassium nitride ✔️ (3 K⁺ ions balance 1 N³⁻ ion)

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📌 Summary:

This worksheet helps students practice:
- Naming binary ionic compounds correctly.
- Interpreting chemical formulas to count atoms.
- Understanding how charges balance in ionic compounds.

Since this is the KEY, you can use it to check student work or study the patterns.

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💡 Tip for Students:
Memorize common ion charges (especially Group 1, 2, Al, Ag, Zn) and learn how to combine them to make neutral compounds. Always write the metal first, then the nonmetal with “-ide”.

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✔ Final Answer:
The worksheet is already fully completed and correct. No further solving is needed — it’s the answer key!

Let me know if you’d like me to explain any specific row or concept in more detail!