2 6 hydrogen bonding
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2.6 Hydrogen Bonding PowerPoint PPT Presentation


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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

2.6.1. 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

van der Waals

ionic

hydrogen

polar-polar

covalent

LO: I understand what is meant by hydrogen bonding.


+

-

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

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


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

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

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


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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