Khan Academy: Hydrogen bonding in water

Purpose: Learn about the essentiality of water to life, and how its unique properties are due to the structure of the water molecule and how it interacts with itself.

Shape of a water molecule: The video explains that water molecules are tetrahedral in shape, with the two hydrogen atoms on one end and the oxygen atom on the other.

Importance of electronegativity: Oxygen is more electronegative than hydrogen, meaning it hogs electrons, forming a partial negative charge at one end of the molecule and a partial positive charge at the other.

Hydrogen bonding: When many water molecules interact, the partially negative side of one molecule is attracted to the partially positive side of another molecule, creating a hydrogen bond, which contributes to water’s unique properties.

  1. What is the shape of a water molecule?
    • a) Linear
    • b) Tetrahedral
    • c) Triangular
    • d) Octahedral
  1. What gives water its special properties?
    • a) The presence of oxygen atom
    • b) The covalent bonds between oxygen and hydrogen atoms
    • c) The unique arrangement of hydrogen atoms
    • d) The hydrogen bonding between water molecules
  1. What is the electronegativity of oxygen in a water molecule?
    • a) Zero
    • b) Slightly negative
    • c) Slightly positive
    • d) Extremely electronegative
  1. Which end of a water molecule has a partially negative charge?
    • a) The end with the two hydrogen atoms
    • b) The end with the lone electron pairs
    • c) The end with the covalent bonds
    • d) Both ends have a partially negative charge
  1. What is the significance of hydrogen bonds in water?
    • a) They give water its unique shape
    • b) They make water highly electronegative
    • c) They cause water to freeze at 0°C
    • d) They allow water molecules to stick together and form a liquid

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