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2.6 Hydrogen Bonding 2.6.1. Hydrogen Bonds
LO: I understand what is meant by hydrogen bonding.
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Increasing strength of bonds/forces
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.
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Hydrogen bonds form in molecules where a hydrogen atom is bonded to a , or . atom.
nitrogen oxygen fluorine H F + - H O + - H2O, CH3OH (methanol) H N + - NH3, CH3NH2 (methylamine) Hydrogen bonds form between a atom in one molecule and a nitrogen, oxygen or fluorine atom in a neighbouring molecule. hydrogen LO: I understand what is meant by hydrogen bonding.
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Boiling Points LO: I understand the pattern in the boiling points of the group 7 hydrides.
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Boiling points of the group 7 hydrides vs period number.
HF HCl HBr HI Boiling Point (˚C) 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.
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H-Bonds and Viscosity LO: I understand the affect H-bonds have on viscosity. LO: I understand the affect H-bonds have on viscosity.
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propan-2-ol propanone H-bonds present H-bonds not present
Propan-2-ol is viscous than propanone due to the H-bonds between the molecules. 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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