Intermolecular Forces 0.0 / 5 ? ChemistryBonding & shapesA2/A-levelAQA Created by: emma.davisonCreated on: 05-11-18 10:54 What is the weakest kind of intermolecular force? Van Der Waal 1 of 18 What is the strongest kind of intermolecular force? Hydrogen Bonds 2 of 18 Between which molecules do Van Der Waal's occur? All molecules 3 of 18 How is a van der waal force occur? Instantenous dipole causing induced dipole in neighbouring molecules, causing temporary attraction 4 of 18 If the molecule is bigger, the Van der Waal force is ... Greater 5 of 18 Between which molecules do Dipole-Dipole forces occur? Only between polar molecules 6 of 18 How do dipole-dipole forces occur? Slightly positive hydrogen attracted to slightly negative atom of another molecule 7 of 18 Between which molecules can hydrogen form a hydrogen bond with? F, O and N 8 of 18 How do hydrogen bonds occur? Very electronegative atoms has lone pair of electrons - hydrogen becomes bonded - gives molecule a strong overall dipole 9 of 18 Why is a strong overall dipole achieved during hydrogen bonding? Large difference in the electronegativity of the atoms 10 of 18 What are three things to include when drawing a hydrogen bond diagram? Straight dotted line for bond, show all lone pairs and include all partial charges 11 of 18 What is the general trend in group 4, for the boiling points of hydrides? Molecules get larger, have more electrons, greater VDW forces 12 of 18 Why do H2O, HF and NH3 have large boiling points? All have hydrogen bonding - strongest kind of intermolecular forces 13 of 18 Why does H2O have higher boiling point than HF and NH3? Oxygen is more electronegative than fluorine and nitrogen 14 of 18 Why do G4 have lowest boiling points? Only contain VDW forces as non of the molecules are polar 15 of 18 What bonds exist between the water molecules in ice? Hydrogen bonds 16 of 18 What happens to the water molecules as the water cools? Number of hydrogen bonds increases 17 of 18 Why does ice have a lower density than water? Molecules held further apart - held in a 3D lattice 18 of 18
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