day 3 notes--intermolecular forces 19-20 complete.notebook
TRANSCRIPT
Day 3 NotesIntermolecular Forces 1920 COMPLETE.notebook March 11, 2020
Daily Quiz 3/11 Turn in homework79.
80.
81.
82.
83.
Reminders 3/11/20Today Tacky Tourist Day
Tomorrow Famous Person Day
Friday World Language TShirt Day
Academic Overtime Saturday (3/14) 10am2pm
ECPI Student/Parent Interest Meeting Wednesday (3/11) @ 6pm
Activity Period Friday (3/13) Meg Jenkins Color Run
Prom Saturday (3/28)
FFA Spring Foxtival Saturday (3/14) 9am2pm
Quarter 3 Test Tuesday 3/17
Quarter 3 Practice Quia due MONDAY night (3/16) https://www.quia.com/quiz/7639479.html
Part 2 Notes: Types of Intermolecular Forces
Unit 9: Intermolecular Forces
20192020 CP Chemistry
Pay AttentionThere are 2 terms that we are getting ready to discuss that sound very similar, but have completely different meanings. Make sure you are communicating the right term at the right time. Intramolecular ForceGorilla Glue
• Ionic or covalent BONDS• Attractive forces between ions or
atoms within a compound• Relatively strong• Takes a lot of energy to break a
bond• 4000 kJ ionic compounds• 1100 kJ covalent compounds
Intermolecular ForceElmer's Glue
• Attractive forces between molecules• Strength is weaker than ionic or
covalent bond• Responsible for the state of matter at
room temperature• Amount of energy to overcome
intermolecular forces> 0.0540 kJmatter without ions> 600 kJmatter with ions
Day 3 NotesIntermolecular Forces 1920 COMPLETE.notebook March 11, 2020
Types of IMFs
London Dispersion ForcesDipoledipole interactionsHydrogen bondingIon dipole interactions
Animations for IMFshttps://www.wisconline.com/learn/naturalscience/chemistry/gch6804/intermolecularforces
temporary or momentary dipoles
As the molecular mass of a compound increases, there are more electrons present so strength of LDF is GREATER!
Gas liquid
solidWhy ?
http://virtuallaboratory.colorado.edu/CLUEChemistry/LondonDispersionForce/1.2interactions0.html
permanent dipoles
Both of these are POLAR MOLECULES!
Day 3 NotesIntermolecular Forces 1920 COMPLETE.notebook March 11, 2020
Hydrogen Bonding
• Definition> Attraction between hydrogen covalently bonded
to N, O, or F in one molecule to the lone electron pairs of N, O, or F in another molecule.
• Just because a molecule contains H does NOT mean that there is hydrogen bonding!
• Relative Strength: Moderate
• Physical Properties> WATER is a GREAT example> Mostly liquids> High boiling points> Surface tension> Adhesion and cohesion
IonDipole Intermolecular Forces of Attraction
• Type of attraction between an ion and the oppositely charged end of a dipole
• This type of attraction is extremely important when you are talking about dissolving an ionic solute in water>this is important to your life!
Practice Questions for Intermolecular Forces
Draw the Lewis structures for each pair of molecules.
List all of the intermolecular forces that are present between the molecules in each case.
1. H2S and HCl
2. NH3 and H2O
3. Cl2 and CS2
Day 3 NotesIntermolecular Forces 1920 COMPLETE.notebook March 11, 2020
1. Is this molecule polar or nonpolar?2. What is the VSEPR geometry?3. Can this molecule hydrogen bond with another CH2O
molecule?4. Can this molecule hydrogen bond with H2S?5. Can this molecule hydrogen bond with NH3?
Types of IMF ? Types of IMF ?
Types of IMF ? Types of IMF ?
Day 3 NotesIntermolecular Forces 1920 COMPLETE.notebook March 11, 2020
Assignment
• Examine the periodic table that contains electronegativity values.
• Use this resource to answer the questions outlined in the POGIL activity.
• You will turn in the activity at the end of the period.
Opening Questions: Tuesday, January 31st
• Make sure you have your postlab questions. You pick up the handout yesterday, but we did not answer the questions yet.
• Get an index card• On the lined side, write your name.
1. Dinitrogen pentoxide2. Magnesium carbonate3. CuNO3
4. PCl35. Are these molecules polar or nonpolar?6. Can these molecules hydrogen bond to each other?7. What type of intramolecular forces are present in each
molecule?
Objectives and Indicators
1. Differentiate between intramolecular and intermolecular forces.2. Use lab data to compare different types of intermolecular forces.
Essential Question: How and why do molecules stick together?
• H.C.3A.4: Plan and conduct controlled scientific investigations to generate data on the properties of substances and analyze the data to infer the types of bonds—ionic, polar covalent, and nonpolar covalent.
• H.C.4A.1: Develop and use models to explain the arrangement and movement of the particles in solids, liquids, gases, and plasma as well as the relative strengths of their intermolecular forces.
• IV.3.a: Describe the characteristics of ionic and covalent bonding• IV.3.f: Compare the different types of intermolecular forces• IV.3.h: Describe the unique physical and chemical properties of water resulting from hydrogen bonding
1. Is this molecule polar or nonpolar?2. What is the VSEPR geometry?3. Can this molecule hydrogen bond with another CH2O
molecule?4. Can this molecule hydrogen bond with H2S?5. Can this molecule hydrogen bond with NH3?
Day 3 NotesIntermolecular Forces 1920 COMPLETE.notebook March 11, 2020
Concept Check: Which picture correctly shows water as it is vaporized?
Changes in the state of matter involve _____________ forces.
Methanol 1‐propanolhexane
ethanol butanol pentane
Background‐ Vaporization: phase change from a liquid to a gas
‐ Evaporation: vaporization at the surface of the liquid ‐ endothermic process‐‐requires energy ‐ must overcome intermolecular forces of attraction
‐ stronger IMFs = slower rate of evaporation and less change in temperature
‐ weaker IMFs = faster rate of evaporation and greater change in temperature
Purpose: Use lab data to rank the relative strengths of the intermolecular forces present in different liquids