InterMolecular Forces (IMF)armorrissey.weebly.com/uploads/1/2/1/5/121599261/unit_4...1. Identify and...
Transcript of InterMolecular Forces (IMF)armorrissey.weebly.com/uploads/1/2/1/5/121599261/unit_4...1. Identify and...
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InterMolecular Forces (IMF)
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Today’s Objectives
◻ Identify and describe the intermolecular forces present in molecules.
◻ Rank molecules based on the intermolecular forces involved.
◻ Assess your knowledge of chemical bonding
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Bond Properties
Four Types of Bonds1.
2.
3.
4.
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Bond Properties: RECALL
Type of Bond Conduct
ElectricityDissolve State at
Room Temp
POLAR N Y Liquid
IONIC Y(aqueous solutions
and when melted)
Y Solid
NON-POLAR N N Gas
METALLIC Y N Solid
MEMORIZE THIS !!
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Warm Up -- Shoulder Buddy Pair
◻ Complete the following chart
Compound Type of Molecule
(I, M, PC, NPC)
Conduct
Electricity?
Dissolve in
Water?
State of Matter
@ Room
Temp?
HCl
Cl-Cl
PH3
BaS
CCl2Br2
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Warm Up -- Ck it
◻ Complete the following chartCompound Type of Molecule
(I, M, PC, NPC)
Conduct
Electricity?
Dissolve in
Water?
State of Matter
@ Room
Temp?
HCl PC N Y Liquid
Cl-Cl NPC N N Gas
PH3Polar Covalent No Yes Liquid
BaS Ionic Yes Yes Solid
CCl2Br2 Polar Covalent No Yes Liquid
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Watch video on InterMolecularForces ( IMFs)
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1. Identify and describe the intermolecular forces present in molecules.
2. Identify and describe the intermolecular forces present in molecules.
3. Rank molecules based on the intermolecular forces involved.
Objectives
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May the Forces be with You
◻ Intramolecular forces- forces within a molecule (bonds!)
◻ Intermolecular forces- the attractions between COVALENT molecules that account for properties such as BP, MP, viscosity, surface tension, and solubility.
◻ Copy in notes
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Types of Intermolecular Forces
◻ Three types: ⬜ London Dispersion Forces - WEAKEST
⬜ Dipole-Dipole
⬜ Hydrogen bonding - STRONGEST
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London Dispersion
◻ Also called induced dipole
◻ Between non-polar covalent molecules
◻ Very very weak
https://www.youtube.com/watch?v=ikKiQIYnqXA
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Dipole-Dipole
◻ Between polar molecules AKA dipoles
◻ Two oppositely charged ends.(one + and one -)
◻ They act like little magnets
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Hydrogen Bonding
◻ The king of intermolecular forces.
◻ Polar molecules with Hydrogen bonded to Nitrogen or Oxygen or Fluorine
◻ Extremely strong.
◻ Accounts for the very special properties of water
◻ https://www.youtube.com/watch?v=UukRgqzk-KE
◻ https://www.youtube.com/watch?v=dBBEpPFNCEs&index=10&list=PLUZuOzXtHwnBAa9pMPc_mOXX8IWC2grR2
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Hydrogen Bonding in Water
Hydrogen bonding in water is responsible for the following properties :• Ice floats• Surface tension• Cohesion• Capillary action
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Ranking Intermolecular Forces
◻ The stronger the IMF the higher the Boiling point and Melting point.
Hydrogen Bonds
Dipole-Dipole
London Dispersion
IncreasingBP/MP
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Learning Team Activity
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Team Discussion
◻ Identify the IMF in each of the following then rank from lowest to highest boiling point
Compound
Lewis Dot
Shape Polar/
Nonpolar
IMF RANK 1-4
1=LOW BP
PH3
CH2Cl2
CO2
H2O
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Practice
◻ Now…rank them in order of increasing boiling point.
CO2
H2O
CH2Cl2
PH3
INCREAS ING
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Practice
Now…rank them in order of increasing boiling point.
CO2 Linear / Nonpolar / London Disp
CH2Cl2 Tetrahedral / Polar /Dipole-dipole
PH3 Trigonal Pyramidal/Polar/Dipole-Dipole
H2O Bent / Polar / Hydrogen Bonding
INCREAS ING
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Turn & Talk
◻ Which will have a higher melting point? Why?
⬜ NH3 or PH3
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◻ Which will have a higher melting point? Why?
⬜ NH3 or PH3
NH3 will have a higher melting point because it contains Hydrogen Bonding between the H of one molecule and the N of another molecule. (See picture below)
PH3 has dipole-dipole forces.
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You Try #1 (INDEPENDENT WORK)
Compound Shape Polar/Nonpolar IMF
H2
NH3
CO
Identify the IMF in each of the following THEN rank them for increasing boiling point
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Put away supplies andReturn to Your Desk.
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You Try
◻ Rank the following in order of increasing boiling point.
H2 CO NH3
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You Try
◻ Rank the following in order of increasing boiling point.
H2 CO NH3
◻ H2 does NOT have H-bonding, only London and has only single bonds within the atom
◻ CO has dipole-dipole making BP higher than H2
◻ NH3 has Hydrogen, thus highest BP
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Homework
Unit 4 Test is FRIDAY 10.12.18
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You Will Create & Complete the IMF column Tonight I
MF