2 6 hydrogen bonding
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2.6 Hydrogen Bonding. 2.6.1. Hydrogen Bonds. LO: I understand what is meant by hydrogen bonding. The bonding in hydrogen fluoride is much stronger than can be accounted for by attractions alone. polar-polar. This is bonding. hydrogen. Increasing strength of bonds/forces.

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2.6 Hydrogen Bonding

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2 6 hydrogen bonding

2.6 Hydrogen Bonding

2.6.1. Hydrogen Bonds

LO: I understand what is meant by hydrogen bonding.


The bonding in hydrogen fluoride is much stronger than can be accounted for by attractions alone

The bonding in hydrogen fluoride is much stronger than can be accounted for by attractions alone.

polar-polar

This is bonding.

hydrogen

Increasing strength of bonds/forces

van der Waals

ionic

hydrogen

polar-polar

covalent

LO: I understand what is meant by hydrogen bonding.


Hydrogen bonds form in molecules where a hydrogen atom is bonded to a or atom

+

-

H

F

+

-

H

O

+

-

H

N

Hydrogen bonds form in molecules where a hydrogen atom is bonded to a , or .atom.

nitrogen

oxygen

fluorine

H2O, CH3OH (methanol)

NH3, CH3NH2 (methylamine)

hydrogen

Hydrogen bonds form between a atom in one molecule and a nitrogen, oxygen or fluorine atom in a neighbouring molecule.

LO: I understand what is meant by hydrogen bonding.


2 6 2 boiling points

2.6.2. Boiling Points

LO:I understand the pattern in the boiling points of the group 7 hydrides.


Boiling points of the group 7 hydrides vs period number

HF

Boiling Point

(˚C)

Period number

HI

HBr

HCl

Boiling points of the group 7 hydrides vs period number.

Extrapolating the graph from HCl downwards would give a boiling point of ˚C for HF.

-100

Hydrogen

bonding has increased the boiling point of HF by over 100˚C.

LO:I understand the pattern in the boiling points of the group 7 hydrides.


2 6 3 h bonds and viscosity

2.6.3. H-Bonds and Viscosity

LO:I understand the affect H-bonds have on viscosity.

LO:I understand the affect H-bonds have on viscosity.


2 6 hydrogen bonding

propan-2-ol

propanone

Propan-2-ol is viscous than propanone due to the H-bonds between the molecules.

H-bonds present

H-bonds not present

more

The H-bonds between the propan-2-ol molecules prevent them from each other easily.

slipping past

LO:I understand the affect H-bonds have on viscosity.


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