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Questions and Answers
What is the main characteristic of hydrogen bonds?
What is the main characteristic of hydrogen bonds?
- They are weaker than covalent or ionic bonds (correct)
- They occur only between two electronegative atoms
- They are limited to biological systems
- They are stronger than covalent or ionic bonds
What role do hydrogen bonds play in DNA?
What role do hydrogen bonds play in DNA?
- They hold together the two strands of DNA (correct)
- They determine the sequence of DNA
- They replicate DNA
- They break apart the two strands of DNA
Why does hydrogen fluoride act as a strong acid?
Why does hydrogen fluoride act as a strong acid?
- Due to its ability to form weak hydrogen bonds
- Due to its ability to form strong hydrogen bonds (correct)
- Due to its ionic bonds
- Due to its highly electronegative atom
What is a consequence of hydrogen bonds in water?
What is a consequence of hydrogen bonds in water?
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What is a characteristic of ammonia due to hydrogen bonding?
What is a characteristic of ammonia due to hydrogen bonding?
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Study Notes
Hydrogen Bonds
- Hydrogen bonds are special attractions between a hydrogen atom and a highly electronegative atom.
- They are weaker than covalent or ionic bonds.
Importance of Hydrogen Bonds
- Hydrogen bonds hold together the two strands of DNA, allowing it to store and transmit genetic information.
- Hydrogen bonds in water contribute to its high boiling point and surface tension.
Hydrogen Bonds in Various Substances
Hydrogen Fluoride
- Hydrogen fluoride is able to act as a strong acid due to its ability to form strong hydrogen bonds.
Ammonia
- The high boiling point of ammonia is due in part to the hydrogen bonding between its molecules.
Summary
- Hydrogen bonds are weak, but have a big impact on the properties of many substances.
- They are the invisible force holding together the building blocks of life, and contribute to the unique properties of many substances.
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