Hydrogen bonds flashcards

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what are hydrogen bonds? hydrogen bonds are attractive forces between the hydrogen attached to an electronegative atom of a molecule and an electronegative atom of another molecule
Hydrogen bonding occurs in molecules when? a hydrogen atom bonded to small electronegative atom is attracted an electron pair on an electronegative atom on an adjacent molecule.
How are hydrogen bonds formed? Hydrogen bonds are formed when a charged part of a molecule with polar covalent bonds forms electrostatic interactions with a substance of an opposite charge
what is the strength of hydrogen bonds? Hydrogen bonds are weak bonds because they are easily and rapidly formed and broken under normal conditions
what compounds can form hydrogen bonds? polar covalent bonds can form hydrogen bonds
Give an example of molecules that form hydrogen bonds? water form hydrogen bonds
Hydrogen bonds are directional bonds, what does that mean? It means that it is stronger when hydrogen atoms align with two electronegative atoms
To form hydrogen bonds a hydrogen atom must be ________ bonded to a very elecronegative atom covalently bonded to a very elecronegative atom
Hydrogen bonds are _________ than ionic and covalent bonds weaker than ionic and covalent bonds
How do hydrogen bonds in water cause an increase in surface tension? A water molecule on the surface of the drop is not attracted to the nonpolar air molecules, only to the other water molecules below and to the sides. The unequal hydrogen bonding draws the water molecules closer together at the surface
Does HF form hydrogen bonds? Yes. HF forms hydrogen bonds because of the difference in the electronegativity of H and F
Hydrogen bonding results in _____ heat of vaporization? higher heat of vaporization
Hydrogen bonding results in _____boiling points? higher boiling points
Hydrogen bonding results in _____ melting points? higher melting points
Hydrogen bonding results in _____ vapor pressure? lower vapor pressure
In DNA hydrogen bonds are responsible for the interaction between purines and pyrimidines to form? the double helix
what bond explains the attraction of water molecules to one another? hydrogen bond

what are hydrogen bonds?

Hydrogen bonding occurs in molecules when?

How are hydrogen bonds formed?

what is the strength of hydrogen bonds?

what compounds can form hydrogen bonds?

Give an example of molecules that form hydrogen bonds?

Hydrogen bonds are directional bonds, what does that mean?

To form hydrogen bonds a hydrogen atom must be ________ bonded to a very elecronegative atom

Hydrogen bonds are _________ than ionic and covalent bonds

How do hydrogen bonds in water cause an increase in surface tension?

Does HF form hydrogen bonds?

Hydrogen bonding results in _____ heat of vaporization?

Hydrogen bonding results in _____boiling points?

Hydrogen bonding results in _____ melting points?

Hydrogen bonding results in _____ vapor pressure?

In DNA hydrogen bonds are responsible for the interaction between purines and pyrimidines to form?

what bond explains the attraction of water molecules to one another?

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