intermolecular forces of attraction. intermolecular forces forces that attract molecules to other...

9

Intermolecular Intermolecular Forces of Forces of Attraction Attraction

Upload: esmond-wells

Post on 17-Jan-2018

217 views

Category:

Documents

0 download

Report

Download

Embed Size (px):

DESCRIPTION

Relative Magnitudes of Forces The types of bonding forces vary in their strength as measured by average bond energy. Covalent bonds (400 kcal) Hydrogen bonding (12-16 kcal ) Dipole-dipole interactions (2-0.5 kcal) London forces (less than 1 kcal) Strongest Weakest

TRANSCRIPT

Page 1: Intermolecular Forces of Attraction. Intermolecular Forces Forces that attract molecules to other molecules. These include: Forces that attract molecules

Intermolecular Intermolecular Forces of Forces of AttractionAttraction

Page 2: Intermolecular Forces of Attraction. Intermolecular Forces Forces that attract molecules to other molecules. These include: Forces that attract molecules

Intermolecular ForcesIntermolecular Forces Forces that attract Forces that attract

molecules to molecules to otherother molecules. These include:molecules. These include: Hydrogen bondingHydrogen bonding Dipole-dipole attractionDipole-dipole attraction London dispersion forcesLondon dispersion forces

Page 3: Intermolecular Forces of Attraction. Intermolecular Forces Forces that attract molecules to other molecules. These include: Forces that attract molecules

Relative Magnitudes of Relative Magnitudes of ForcesForces

The types of bonding forces vary in The types of bonding forces vary in their strength as measured by their strength as measured by average bond energy.average bond energy.

Covalent bonds (400 kcal)

Hydrogen bonding (12-16 kcal )

Dipole-dipole interactions (2-0.5 kcal)

London forces (less than 1 kcal)

Strongest

Weakest

Page 4: Intermolecular Forces of Attraction. Intermolecular Forces Forces that attract molecules to other molecules. These include: Forces that attract molecules

Hydrogen Hydrogen BondingBonding

Bonding between hydrogen and more electronegative neighboring atoms such as oxygen and nitrogen

Base pairing in DNA by hydrogen bonding

Page 5: Intermolecular Forces of Attraction. Intermolecular Forces Forces that attract molecules to other molecules. These include: Forces that attract molecules

Hydrogen Bonding in Hydrogen Bonding in WaterWater

Page 6: Intermolecular Forces of Attraction. Intermolecular Forces Forces that attract molecules to other molecules. These include: Forces that attract molecules

PolarityPolarity A molecule, such as HF, that

has a center of positive charge and a center of negative charge is said to be polar, or to have a dipole moment.

HH FF++ --

Page 7: Intermolecular Forces of Attraction. Intermolecular Forces Forces that attract molecules to other molecules. These include: Forces that attract molecules

Dipole-Dipole Dipole-Dipole AttractionAttraction

Attraction between oppositely charged regions of neighboring molecules.

Dipole-dipole attraction in hydrogen chloride, a gas that is used to make hydrochloric acid

Page 8: Intermolecular Forces of Attraction. Intermolecular Forces Forces that attract molecules to other molecules. These include: Forces that attract molecules

London (Dispersion) Forces The weakest of intermolecular

forces, these forces are proportional to the mass of the molecule These are the only forces of attraction between completely nonpolar molecules

Large nonpolar molecules may have substantial dispersion forces, resulting in relatively high boiling points Small nonpolar molecules have weak dispersion forces and exist almost exclusively as gases

Page 9: Intermolecular Forces of Attraction. Intermolecular Forces Forces that attract molecules to other molecules. These include: Forces that attract molecules

London Forces in London Forces in HydrocarbonsHydrocarbons

Solids, liquids and gases Solids, liquids, and gases are held together by intermolecular forces. Intermolecular forces occur between molecules, not within

Intermolecular Forces: relationships between molecules

Solids. Molecular Solids Covalently bound molecules held together by intermolecular forces

Intermolecular Forces. How are molecules held together? There are two types of attraction in molecules: ◦ Intramolecular forces ◦ Intermolecular forces

1 Intermolecular Forces Chemistry. 2 Intermolecular Forces Intermolecular forces are attractive forces between molecules. Intramolecular forces hold atoms

Intermolecular Forces of Attraction. What holds molecules together? Intramolecular Forces – attractive forces within compounds that hold the compound

Intermolecular Forces of Organic Molecules

Forces of attraction/repulsion between molecules. intermolecular intramolecular intermolecular forces Forces of attraction/repulsion within a molecule

Intramolecular and Intermolecular Forces. Intramolecular Forces – Molecular Forces found within molecules 1)Ionic Bond (electrons transferred between

Intermolecular Forces 11.2 Intermolecular forces are attractive forces between molecules. Intramolecular forces hold atoms together in a molecule. Intermolecular

Intermolecular Forces Intermolecular Forces: weaker interactions that occur between molecules. These are collectively known as Van der Waals forces. Intramolecular

Intermolecular and Ionic Forces - Welcome to web.gccaz.edurob2108739/Intermolecular Forces...Intermolecular and Ionic Forces Introduction: Molecules are attracted to each other in

13. Intermolecular Forces€¦ · Web viewThe attractions between molecules are called intermolecular forces. The different types of intermolecular attractions are: dispersion (London)

Intramolecular Forces vs Intermolecular Forces. Intramolecular Forces There are 2 types of attraction in molecules: intramolecular bonds & intermolecular

Intermolecular Forces - Surface · PDF file1 Intermolecular forces holding molecules together. Intermolecular Forces - Surface Tension - Cohesive forces: interactions between like

Intermolecular Forces The forces of attraction between molecules are known as intermolecular forces. The boiling point of a liquid is a good measure of

INTERMOLECULAR FORCES - Anoka-Ramsey …webs.anokaramsey.edu/pieper/Chem1020/Chapter 12.pdf · intermolecular forces that attract the molecules to one another -the liquid turns into

Liquids & Solids I. Intermolecular Forces. A. Definition of IMF Attractive forces between molecules. Much weaker than chemical bonds within molecules

Intermolecular Forces Forces Between Molecules. Why are intermolecular forces important? They determine the phase of a substance at room temperature

Chapter 12 Intermolecular Forces of Attractioncf.linnbenton.edu/mathsci/physci/backusr/upload/Chapter 12... · Intermolecular Forces –Attractive or Repulsive Forces between molecules

Intermolecular Forces - Doplay · ♦ Describe the relationship between evaporation rate and the strength of intermolecular forces of attraction among molecules

Solids, Liquids, Energy & Heat. Intermolecular Forces “Inter” => between “molecular” => molecules Intermolecular forces apply only to covalent bonds

Intermolecular Forces...Intermolecular forces influence when the substance melts and boils. Difference Intramolecular forces build molecules. Intramolecular forces create units Title

Comparing Ionic and Covalent Compounds...Comparing Ionic and Covalent Compounds, continued Intermolecular Forces Attract Molecules to Each Other Section 2 Intermolecular Forces •Intermolecular

Types of Intermolecular Forces - COnnecting REpositories · INTERMOLECULAR FORCES: Polarity of Molecules Seventh Course (General Chemistry) by Dr. Istadi 2 Types of Intermolecular

Covalent Bonding - BYU Physics and Astronomy · • Forces between atoms in molecules. – “Intramolecular” • Forces between molecules in a liquid or solid. – “Intermolecular”

Chapter 10 Liquids and Solids Intermolecular Forces Forces between (rather than within) molecules. dipole-dipole attraction: molecules with dipoles orient

Aula #11 - moodle.up.pt · Aula #11. Atoms and Molecules. Intermolecular Forces Liquids and Solids States of Mater. e.g. Plasma Intermolecular Forces Liquids and Solids. Intermolecular

Chemical Bonding I: Basic Concepts Chapter 9. Intermolecular Forces 11.2 Intermolecular forces are attractive forces between molecules. Intramolecular

Chapter 11 - Intermolecular Forces, Liquids and Solidsmichael.lufaso/chem2046/2046chapter11.pdf · Intermolecular Forces Learning goals and key skills: ... that exist between molecules

Lecture VI.Intermolecular Forcesjude.edu.sy/assets/uploads/lectures/Lecture VI... · Intermolecular Forces 12.2 Intermolecular forces are attractive forces between molecules. Intramolecular

3.4 INTERMOLECULAR FORCES. INTERMOLECULAR FORCE An attraction between molecules Weaker than the forces within the molecules

Intermolecular Forces (IMFs) What Makes Molecules Stick To One Another?

Intermolecular Forces of Attraction Attractive forces that cause atoms or molecules to stick together

Intermolecular Forces. Van der Waals Forces—the two weakest attractions between molecules. –Dipole interaction—polar molecules are attracted to one another