Chemistry worksheet designed to help students practice distinguishing between ionic and covalent bonds using a periodic table.

To solve the problem of identifying ionic and covalent bonds in the given formulas, we need to follow these steps:

Steps:

1. Identify the elements in each formula.
2. Categorize the elements as either "metals" or "non-metals" using the periodic table.
3. Determine the type of bond based on the nature of the elements:
- Ionic Bond: Forms between a metal and a non-metal.
- Covalent Bond: Forms between two non-metals.

Periodic Table Reference:

- Metals: Typically found on the left side of the periodic table (excluding hydrogen).
- Non-Metals: Found on the right side of the periodic table (including hydrogen).

Solution:

#### 1. HF
- Elements: Hydrogen (H), Fluorine (F)
- Categories:
- Hydrogen: Non-metal
- Fluorine: Non-metal
- Type of Bond: Covalent

#### 2. NaCl
- Elements: Sodium (Na), Chlorine (Cl)
- Categories:
- Sodium: Metal
- Chlorine: Non-metal
- Type of Bond: Ionic

#### 3. C₄H₁₀
- Elements: Carbon (C), Hydrogen (H)
- Categories:
- Carbon: Non-metal
- Hydrogen: Non-metal
- Type of Bond: Covalent

#### 4. Al₂O₃
- Elements: Aluminum (Al), Oxygen (O)
- Categories:
- Aluminum: Metal
- Oxygen: Non-metal
- Type of Bond: Ionic

#### 5. CBr₄
- Elements: Carbon (C), Bromine (Br)
- Categories:
- Carbon: Non-metal
- Bromine: Non-metal
- Type of Bond: Covalent

#### 6. Na₂S
- Elements: Sodium (Na), Sulfur (S)
- Categories:
- Sodium: Metal
- Sulfur: Non-metal
- Type of Bond: Ionic

#### 7. Sr₃N₂
- Elements: Strontium (Sr), Nitrogen (N)
- Categories:
- Strontium: Metal
- Nitrogen: Non-metal
- Type of Bond: Ionic

#### 8. H₂S
- Elements: Hydrogen (H), Sulfur (S)
- Categories:
- Hydrogen: Non-metal
- Sulfur: Non-metal
- Type of Bond: Covalent

#### 9. BaF₂
- Elements: Barium (Ba), Fluorine (F)
- Categories:
- Barium: Metal
- Fluorine: Non-metal
- Type of Bond: Ionic

#### 10. C₂H₆
- Elements: Carbon (C), Hydrogen (H)
- Categories:
- Carbon: Non-metal
- Hydrogen: Non-metal
- Type of Bond: Covalent

#### 11. NO₂
- Elements: Nitrogen (N), Oxygen (O)
- Categories:
- Nitrogen: Non-metal
- Oxygen: Non-metal
- Type of Bond: Covalent

#### 12. MgCl₂
- Elements: Magnesium (Mg), Chlorine (Cl)
- Categories:
- Magnesium: Metal
- Chlorine: Non-metal
- Type of Bond: Ionic

Final Answer:

\[
\begin{array}{|c|c|c|c|}
\hline
\text{Formula} & \text{Metals} & \text{Non-Metals} & \text{Type of Bond} \\
\hline
1. \text{HF} & \text{None} & \text{Hydrogen, Fluorine} & \text{Covalent} \\
\hline
2. \text{NaCl} & \text{Sodium} & \text{Chlorine} & \text{Ionic} \\
\hline
3. \text{C}_4\text{H}_{10} & \text{None} & \text{Carbon, Hydrogen} & \text{Covalent} \\
\hline
4. \text{Al}_2\text{O}_3 & \text{Aluminum} & \text{Oxygen} & \text{Ionic} \\
\hline
5. \text{CBr}_4 & \text{None} & \text{Carbon, Bromine} & \text{Covalent} \\
\hline
6. \text{Na}_2\text{S} & \text{Sodium} & \text{Sulfur} & \text{Ionic} \\
\hline
7. \text{Sr}_3\text{N}_2 & \text{Strontium} & \text{Nitrogen} & \text{Ionic} \\
\hline
8. \text{H}_2\text{S} & \text{None} & \text{Hydrogen, Sulfur} & \text{Covalent} \\
\hline
9. \text{BaF}_2 & \text{Barium} & \text{Fluorine} & \text{Ionic} \\
\hline
10. \text{C}_2\text{H}_6 & \text{None} & \text{Carbon, Hydrogen} & \text{Covalent} \\
\hline
11. \text{NO}_2 & \text{None} & \text{Nitrogen, Oxygen} & \text{Covalent} \\
\hline
12. \text{MgCl}_2 & \text{Magnesium} & \text{Chlorine} & \text{Ionic} \\
\hline
\end{array}
\]

\boxed{
\begin{array}{|c|c|c|c|}
\hline
\text{Formula} & \text{Metals} & \text{Non-Metals} & \text{Type of Bond} \\
\hline
1. \text{HF} & \text{None} & \text{Hydrogen, Fluorine} & \text{Covalent} \\
\hline
2. \text{NaCl} & \text{Sodium} & \text{Chlorine} & \text{Ionic} \\
\hline
3. \text{C}_4\text{H}_{10} & \text{None} & \text{Carbon, Hydrogen} & \text{Covalent} \\
\hline
4. \text{Al}_2\text{O}_3 & \text{Aluminum} & \text{Oxygen} & \text{Ionic} \\
\hline
5. \text{CBr}_4 & \text{None} & \text{Carbon, Bromine} & \text{Covalent} \\
\hline
6. \text{Na}_2\text{S} & \text{Sodium} & \text{Sulfur} & \text{Ionic} \\
\hline
7. \text{Sr}_3\text{N}_2 & \text{Strontium} & \text{Nitrogen} & \text{Ionic} \\
\hline
8. \text{H}_2\text{S} & \text{None} & \text{Hydrogen, Sulfur} & \text{Covalent} \\
\hline
9. \text{BaF}_2 & \text{Barium} & \text{Fluorine} & \text{Ionic} \\
\hline
10. \text{C}_2\text{H}_6 & \text{None} & \text{Carbon, Hydrogen} & \text{Covalent} \\
\hline
11. \text{NO}_2 & \text{None} & \text{Nitrogen, Oxygen} & \text{Covalent} \\
\hline
12. \text{MgCl}_2 & \text{Magnesium} & \text{Chlorine} & \text{Ionic} \\
\hline
\end{array}
}