Which type of bond must be broken for water to vaporize?
Correct answer: C. Hydrogen bonds
- A. Nonpolar covalent bonds
- B. Polar covalent bonds
- C. Hydrogen bonds
- D. Covalent bonds
Explanation
For water to vaporize (turn from a liquid into a gas), the type of bond that must be broken is Hydrogen bondsWater molecules are held together by hydrogen bonds, which are relatively weak interactions compared to the covalent bonds holding the hydrogen and oxygen atoms within each water molecule (covalent bonds are not broken during vaporization). When water vaporizes, the hydrogen bonds between water molecules are disrupted, allowing the molecules to escape into the gas phase. This requires energy input to break the hydrogen bonds and convert liquid water into water vapor.
This question appeared on the UHS MDCAT 2023 paper, which you can sit online with every answer explained.
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About Biological Importance of Water
Water supports life through its polarity, hydrogen bonding and ability to dissolve ionic and polar substances. Its high specific heat, heat of vaporization, cohesion, adhesion and incompressibility help regulate temperature, transport materials and maintain structure, while hydrolysis and osmosis depend directly on water.
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