unit 3 day 5 intermolecular forces. do now/catalyst (8 min) entrance slip: write your name and...
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UNIT 3 DAY 5
Intermolecular Forces
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Do Now/Catalyst (8 min)
Entrance Slip: Write your name and period at the top. If you did not do Day 2, Day 3 or Day 4 Questions, do
those nowAnswer the questions under Day 5.You may use your notes.SHOW:
Calculation to find the number of bonds (2 pts)
Correct Lewis Structure (2 pts)
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How are you doing?
Period 1 Period 5 Period 7 Period 2 Period 4 Period 6 Period 865
70
75
80
85
90
73
8782
7581 82
Unit 3 Day 4: Ionic Bonds Class Average Mastery
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Announcements
Edmodo – see class codes on boardACT tutoring Sat 9am-12pmBehavior Grade every two weeks - loginOffice hours: Tuesday, Wednesday and
ThursdayNew homework policy – NO late work
acceptedBRING YOUR NOTES PACKET EVERYDAY!
Homework Due Exam Unit 3Friday 11/9 ODD Wednesday 11/14
ODDTuesday 11/13 EVEN
Thursday 11/15 EVEN
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Objectives: Intermolecular Forces
SWBAT define Van der Waals, Dispersion, Dipole-Dipole, and Hydrogen Bonding forces and compare their relative strengths.
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Real World!
Water Striders can walk on water because of hydrogen bonding and strong attractions in the water molecules!
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Intermolecular Forces
Intermolecular Forces are forces between individual atoms or compounds that hold molecules together. They are weaker than the bonds between atoms in a molecule, which are called intramolecular forces.
Reminder: dipole results from differences in electronegativity, which produce small charges on atoms in a molecule.
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Intermolecular Forces
Intermolecular forces come in three types, depending on polarity.1. Dispersion Forces2. Dipole-Dipole Forces3. Hydrogen Bonding
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Dispersion Forces
Result from interactions between molecules, temporary charges between non-polar molecules. They are very weak.
Results from Strength Diagram
Attractive force between neighboring molecules, caused by motion of electrons
Weakest of all the forces
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Dispersion Forces: Diagram
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Dipole-Dipole Interactions
Result from permanent partial charges. These forces are also polar, and thus slightly stronger than dispersion forces.
Note: Both Dispersion Forces and Dipole-Dipole Interactions are sometimes called van der waals forces.Results from Strength Diagram
Negative region of one polar molecule attracted to positive region of other polar molecule
Medium strength
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Dipole-Dipole Interactions: Diagram
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Hydrogen Bonding
Very similar to intramolecular forces. These are strong and permanent forces (“bonds”) that result from a special type of polar attraction. Form between H and either N, O, F or Cl ONLY.Results from Strength Diagram
Slightly positive H bonded to one atom is also weakly attracted to another EN atom
ONLY N, O, F or Cl
Strongest of the forces
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Hydrogen Bonding: Diagram
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We Do: CFU #1
Order these forces from strongest to weakest: Hydrogen Bonding, Dispersion Forces, Dipole-Dipole Interactions, Covalent Bonds.
Covalent bonds, hydrogen bonding, dipole-dipole interactions, dispersion forces
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We Do: CFU #2
True or False: Intermolecular Forces hold the atoms in a molecule together
False
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We Do: CFU #3
True or False: These forces rely on differences in polarity, which produces small charges on the molecules.
True
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We Do: CFU #4
Do you think it would be harder to pull a molecule away from a compound that was held together using Hydrogen Bonds or Dipole-Dipole Interactions? Why?
Hydrogen bonds, they have stronger interactions
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We Do: CFU #5
Do forces get stronger or weaker as differences in electronegativity increase (as polarity increases)?
Stronger
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You Do: Forces Poster (20 min)
Fold paper into 3 sections, one for dipole interactions, dispersion forces and hydrogen bonding. On your posters include the following information for each force (use notes and p.250-51 of text):Definition2 factsOne real world example (except for Dipole)Drawing/diagram
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Chemistry Interim Test
Counts as a grade so do your best!
Mark all answers on your answer sheet
25 questions
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Closing
Essential Question:
What holds the individual molecules in a compound together?