Which statement about water is correct?
- 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.
Related questions
Which class of organic molecule forms the greatest proportion of the dry mass of a typical cell?
The four elements that together make up about 99 per cent of the mass of living matter are
The monomer unit from which a nucleic acid is built is
The process by which small molecules join together to build a macromolecule, with water released at each link, is called
Which element is always present in proteins but never in simple carbohydrates or triglycerides?