Examples of Polar Molecules: A Comprehensive List

📚 Quick Study Guide

• 🧲 Polar molecules have an uneven distribution of electron density due to differences in electronegativity between bonded atoms.
• ⚡ This unequal sharing creates partial positive ($δ+$) and partial negative ($δ−$) charges within the molecule.
• 📏 Molecular geometry plays a crucial role; a molecule can have polar bonds but be nonpolar overall if the bond dipoles cancel out.
• 💧 Key properties of polar molecules include higher boiling points, solubility in polar solvents (like water), and dipole-dipole interactions.
• 🧪 To determine polarity, consider the electronegativity difference between atoms and the molecule's shape. If the molecule has lone pairs or asymmetrical arrangement, it is likely polar.

🧪 Practice Quiz

1. Which of the following molecules is polar?
   1. $CO_2$
   2. $CCl_4$
   3. $H_2O$
   4. $CH_4$
2. What causes a molecule to be polar?
   1. Symmetrical shape
   2. Equal sharing of electrons
   3. Unequal sharing of electrons
   4. Presence of only carbon and hydrogen atoms
3. Which of the following is a characteristic of polar molecules?
   1. Low boiling point
   2. Solubility in nonpolar solvents
   3. Dipole-dipole interactions
   4. Weak intermolecular forces
4. Which of the following molecules contains polar bonds but is nonpolar overall?
   1. $NH_3$
   2. $BF_3$
   3. $H_2O$
   4. $HF$
5. Which of the following best describes the electronegativity difference in a polar molecule?
   1. Zero
   2. Small to moderate
   3. Very large
   4. Negative
6. Which of the following is a polar solvent?
   1. Hexane
   2. Toluene
   3. Water
   4. Benzene
7. Which of the following molecules is linear and polar?
   1. $CS_2$
   2. $BeCl_2$
   3. $COS$
   4. $CO_2$