CIRCLE two covalent bonds and two hydrogen bonds in this image; label them. BOX a polar covalent bond. <IMAGE>

Verified step by step guidance

1. Identify the types of bonds present in the image: covalent bonds, hydrogen bonds, and polar covalent bonds.
2. Look for covalent bonds, which are typically represented by lines connecting two atoms, indicating shared electrons.
3. Identify hydrogen bonds, which are usually depicted as dashed or dotted lines between a hydrogen atom and an electronegative atom like oxygen or nitrogen.
4. Find a polar covalent bond, which involves unequal sharing of electrons between atoms, often between a hydrogen atom and a more electronegative atom like oxygen or nitrogen.
5. Circle two covalent bonds and two hydrogen bonds, and box a polar covalent bond, labeling each accordingly.

Key Concepts

Covalent Bonds

Covalent bonds are chemical bonds formed when two atoms share one or more pairs of electrons. This sharing allows each atom to attain a full outer shell of electrons, leading to greater stability. Covalent bonds can be single, double, or triple, depending on the number of shared electron pairs. They are typically strong and are fundamental in forming molecules.

Hydrogen Bonds

Hydrogen bonds are weak attractions that occur between a hydrogen atom covalently bonded to an electronegative atom and another electronegative atom. These bonds are crucial in determining the properties of water and the structure of proteins and nucleic acids. Although weaker than covalent bonds, hydrogen bonds play a significant role in the stability and functionality of biological molecules.

Polar Covalent Bonds

Polar covalent bonds occur when two atoms share electrons unequally due to differences in their electronegativities. This results in a molecule with a partial positive charge on one end and a partial negative charge on the other, creating a dipole. Water is a classic example of a molecule with polar covalent bonds, which contributes to its unique properties, such as high surface tension and solvent capabilities.