Which statement about water is correct?
Correct answer: B. It has an unusually high boiling point for such a small molecule because of hydrogen bonding
- A. Its molecules are held together by ionic bonds
- B. It has an unusually high boiling point for such a small molecule because of hydrogen bonding
- C. Its solid form is denser than its liquid form
- D. It ionises completely into hydrogen and hydroxide ions
Explanation
Hydrogen bonding between polar water molecules means far more energy is needed to separate them than its tiny molecular mass would suggest, giving a boiling point of 100 degrees Celsius. Ice is less dense than liquid water, and water ionises only very slightly.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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