bonding intermolecular forces saroj manoj raman, occ
TRANSCRIPT
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Bonding Bonding Intermolecular forces
SAROJ MANOJ RAMAN, OCC
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Kinds of moleculesKinds of molecules
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Proof for existence of Proof for existence of intermolecular forcesintermolecular forces
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Types of Intermolecular Types of Intermolecular forcesforces
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Examples to explain Van der waals’ Examples to explain Van der waals’ forcesforces
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Examples to explain dipole-dipole Examples to explain dipole-dipole forces forces
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Hydrogen bondingHydrogen bondingHδ+— Fδ- ---------------Hδ+— Fδ-
hydrogen bondConsiderably stronger than other
intermolecular forces.Affects the physical properties of
the compounds in which it exists.
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Examples of H-BondingExamples of H-Bonding
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Hydrogen Bonding in diff. Hydrogen Bonding in diff. compoundscompounds
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Examples of H-Bonding Examples of H-Bonding contd….contd….
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Examples of H-Bonding Examples of H-Bonding contd….contd….
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Trends in Boiling points of Trends in Boiling points of Groups 4,5,6 and 7Groups 4,5,6 and 7
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Examples of H-Bonding Examples of H-Bonding contd….contd….
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Anomalous behavior of Anomalous behavior of WaterWater
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Structure of ICEStructure of ICE
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Hydrogen Bonds in Water, Hydrogen Bonds in Water, IceIce
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Compare HCompare H22O and HO and H22SSProperties Water Hydrogen
sulphide
Molar enthalpy of fusion 6.0 kJmol-1 2.4 kJmol-1
Molar enthalpy of vaporization
41.0 kJmol-1 19.0 kJmol-1
State at room temperature & Pressure
Liquid Gas
Electro negativity Very high Less
Size O atom is small
S is larger than O
Hydrogen Bonding 2 H bonds per molecule of water
No H Bonding
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Effect of H bonding on Effect of H bonding on Organic compounds- case 1Organic compounds- case 1
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Dimer of Ethanoic acidDimer of Ethanoic acid
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Effect of H bonding on Effect of H bonding on Organic compounds- case 2Organic compounds- case 2Propanone is miscible in water
but it has no H bonding between propanone molecules
This is because its O atoms can bond to water molecules.
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Effect of H bonding on Effect of H bonding on Organic compounds- case 3Organic compounds- case 3p- nitro phenol or 4- nitro phenol
is having intermolecular H bonds , stronger forces of interaction between molecules and so its BP is 279°C
o- nitro phenol or 2- nitro phenol has intramolecular H bonds, weaker forces of interaction between molecules and so has lower BP of 216°C
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Biological importance of H Biological importance of H bondingbondingDNA pairing occurs due to H
bonds.Secondary structure of proteins
(α helix and β pleated proteins) α helix-is an example of INTRA
MOLECULAR H Bonding
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Hydrogen bonds in DNA Base Hydrogen bonds in DNA Base PairsPairs2 H bonds between Adenine and Thymine3 H bonds between Cytosine and Guanine