What does H-O-H represent? a. ionic bonding of water b. a molecule of water c. an atom of water d. a mixture including water
The Correct Answer and Explanation is :
The correct answer is b. a molecule of water.
The notation “H-O-H” represents the structure of a water molecule, where two hydrogen atoms (H) are bonded to one oxygen atom (O). This arrangement is also commonly represented as H₂O. The bonds between hydrogen and oxygen in water are covalent bonds, meaning that the atoms share electrons to achieve stability. More specifically, these bonds are polar covalent, which means the electrons are not shared equally.
Structure of Water Molecule (H-O-H)
In a water molecule, the oxygen atom is more electronegative than the hydrogen atoms. Electronegativity is the tendency of an atom to attract electrons in a bond. As a result, the oxygen atom pulls the shared electrons closer to itself, making it partially negatively charged (denoted δ-) and leaving the hydrogen atoms partially positively charged (denoted δ+). This polarity gives water its unique properties.
Importance of Water’s Molecular Structure
Because of the bent shape of the H-O-H molecule (with a bond angle of approximately 104.5°), water is a polar molecule. This polarity is responsible for water’s ability to form hydrogen bonds with other water molecules or substances, leading to its high cohesion, surface tension, and ability to dissolve many polar substances. This makes water a “universal solvent,” playing a crucial role in biological systems, chemical reactions, and the environment.
Why Other Options are Incorrect
- a. Ionic bonding of water: Water molecules are held together by covalent bonds, not ionic bonds.
- c. An atom of water: Water is a molecule, not an atom. An atom refers to a single element, while a molecule is a group of atoms bonded together.
- d. A mixture including water: “H-O-H” represents a single molecule, not a mixture.