Flashcards
6.3 Intermolecular forces
Cards in this deck (19)
- 1what are Intermolecular forces?# Weak interactions between Dipoles of Different molecules
- 2Describe an Induced Dipole (London forces)# MOVEMENT of E-'s produces a changing dipole in a molecule
# at any instant, an INSTANTANEOUS dipole will exist, but its position is always SHIFTING
# the INSTANTANEOUS dipole INDUCES a dipole on near molecules
# the INDUCED dipole INDUCES more near molecules, which attract each other - 3what happens to Induced Dipole, when there are More Electrons in each molecule?# Larger instantaneous and Induced Dipoles
# Greater induced dipole-dipole interaction
# Stronger the attractive forces between molecules - 4why does Boiling point of first 3 noble gases, increase He Ne Ar# Larger numbers of e-'s = Larger induced Dipoles
-> More Energy needed to overcome the intermolecular forces
-> increasing boiling point - 5what Intermolecular forces are there between Fluorine, F-F and Hydrogen chloride, H-Cl? Polarity?Fluorine molecules
@ Non-Polar
@ only have London Forces(induced d-d)
H-Cl molecules
~ Polar
~ London forces AND Permanent di-di interactions - 6who has the Higher boiling point ? F2 or HClHydrogen chloride
- 7a Simple Molecular Substance is made up of?# small units containing a definite number of atoms
# with a definite Molecular Formula
-> Ne, H2, H2O, CO2 - 8Structure in the Solid state?Simple Molecular Lattice
-> regular structure
# MOLECULES held in place by Weak Inter molecular forces
# ATOMS within each molecule are bonded by Strong Covalent bonds - 9do Simple Molecular substances have High or Low Melting/Boiling points?Low melting/boiling points
# Only the Weak Intermolecular forces can be overcome by the energy present at low temperatures (requires low energy)
# Covalent bonds between atoms do Not break - 10can they all be Solidified?# All simple molecular substances can be solidified
#into simple molecular Lattices by
# Reducing the temperature - 11how and what happens when Solid iodine turns into a gas?# Iodine is Solid at room temp
# small bunsen burner Flame provides enough Energy to Break
-> Weak intermolecular forces between Iodine MOLECULES
@ Sublimation (solid->gas) - 12Solubility between a Non-Polar molecule and a Non-Polar solvent# Inter molecular forces form between
-> Molecules and Solvent (hexane)
# these Interactions Weaken the inter-molecular forces
-> in the simple molecular Lattice
# inter-molecular forces Break and compound dissolves
Soluble - 13Solubility between a Non-Polar molecule and a Polar solvent# Little Interaction between the molecules in the Lattice and solvent
# Inter-molecular bonding within SOLVENT is too strong to be broken
insoluble - 14do Polar covalent substances dissolve in Polar solvents?# they May as the
-> Polar solute molecules and the Polar solvent molecules can attract each other - 15does Sugar dissolve in Water?Yes
# Sugar is a Polar covalent compund with many Polar O-H bonds
# Water is a Polar molecule
-> Opposite partial charges of Dipoles in sugar and water attract - 16what does Solubility Depend on?# Strength of the Dipole
-> hard to predict - 17whats Special about Ethanol ? CH3CH2OH# contains BOTH Polar and Non-Polar parts
-> Polar (O-H)
-> Non-polar (carbon chain)
# Dissolves in BOTH Polar and Non-polar solvents - 18do Simple Molecules conduct Electricity# there are NO Mobile Charged particles to carry a charge
#so there is Nothing to Complete an electrical circuit
Non-conductors of electricity - 19—
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- GCSE Chemistry (Foundations in chemistry) Flashcards on 6.3 Intermolecular forces, created by Sea Chel Pie on 10/12/2018.
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- Sea Chel Pie
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