Examples of Single Covalent Bonds in Molecules

🧪 Quick Study Guide

• ⚛️ A covalent bond involves the sharing of electrons between atoms.
• 🤝 A single covalent bond is formed when two atoms share one pair of electrons (2 electrons total).
• 💧 Common examples include molecules like hydrogen ($H_2$), chlorine ($Cl_2$), and methane ($CH_4$).
• 📝 In Lewis structures, a single covalent bond is represented by a single line (-) between atoms.
• ⚡ The atoms sharing electrons are typically nonmetals.
• 💡 Single bonds are generally weaker and longer than double or triple bonds.
• 🧮 Electronegativity differences between bonded atoms determine the polarity of the bond. If the difference is small, the bond is considered nonpolar covalent.

Practice Quiz

1. Which of the following molecules contains only single covalent bonds?
   1. A. $O_2$
   2. B. $N_2$
   3. C. $H_2O$
   4. D. $CO_2$
2. How many electrons are shared in a single covalent bond?
   1. A. 1
   2. B. 2
   3. C. 3
   4. D. 4
3. Which of the following elements is most likely to form a single covalent bond with another identical atom?
   1. A. Sodium (Na)
   2. B. Magnesium (Mg)
   3. C. Chlorine (Cl)
   4. D. Potassium (K)
4. What is the correct Lewis structure representation of a single covalent bond?
   1. A. =
   2. B. ≡
   3. C. -
   4. D. •
5. Which of these molecules contains a single bond between carbon and hydrogen?
   1. A. $C_2H_4$
   2. B. $C_2H_2$
   3. C. $CH_4$
   4. D. $C_2H_6$
6. Which molecule features only single covalent bonds between all its atoms?
   1. A. Carbon Dioxide ($CO_2$)
   2. B. Ethylene ($C_2H_4$)
   3. C. Ammonia ($NH_3$)
   4. D. Oxygen ($O_2$)
7. In a water molecule ($H_2O$), what type of bond exists between oxygen and each hydrogen atom?
   1. A. Double covalent bond
   2. B. Triple covalent bond
   3. C. Single covalent bond
   4. D. Ionic bond