Intra vs Inter The prefix intra- means “within”

Slides:



Advertisements
Similar presentations
Recall from Ionic Bonding…
Advertisements

INTERMOLECULAR FORCES. Three types of force can operate between covalent (not ionic) molecules:  Dispersion Forces also known as London Forces as Weak.
Forces Between Molecules. Bonding model for covalent molecular substances Bonding for covalent molecular substances falls into two categories 1.The strong.
2.4 Intermolecular Forces
Higher Chemistry Unit 1(d) Intermolecular forces of attraction
Intermolecular Forces The physical properties of melting point, boiling point, vapor pressure, evaporation, viscosity, surface tension, and solubility.
Interparticle Bonding
Intermolecular Forces. How are molecules held together? There are two types of attraction in molecules: ◦ Intramolecular forces ◦ Intermolecular forces.
Recall from Ionic Bonding…
Unit 6: Covalent Bonding Intermolecular Forces. Intra- versus Inter- molecular Forces Intra (means “within”) and refers to the forces that hold atoms.
3.4 INTERMOLECULAR FORCES. INTERMOLECULAR FORCE An attraction between molecules Weaker than the forces within the molecules.
Solubility: Molecular Polarity. How do molecules stay together?
Intermolecular Forces Chemistry 11 Ms. McGrath. Intermolecular Forces The forces that bond atoms to each other within a molecule are called intramolecular.
Why do some solids dissolve in water but others do not? Why are some substances gases at room temperature, but others are liquid or solid? The answers.
Why do some solids dissolve in water but others do not? Why are some substances gases at room temperature, but others are liquid or solid? The answers.
What are Intermolecular forces? Intermolecular forces are weak forces of attraction between some covalent molecules. These attractions are responsible.
Intermolecular Forces
Chemistry Semester Review: Compounds: Intermolecular forces: Intermolecular forces: 1.London (dispersion) forces; dipole-dipole forces; hydrogen bonds.
Intermolecular Forces Chemistry 11 Ms. McGrath. Intermolecular Forces The forces that bond atoms to each other within a molecule are called intramolecular.
9-9 Intermolecular Forces (IMFs) ~ (Section 14.3) And you.
3.4 Intermolecular Forces. Intermolecular Forces These forces determine the following physical properties within chemicals: –State –Melting point –Boling.
Intermolecular Forces
Intermolecular Forces
Kintetic Molecular Theory
Materials Science Lesson 8.
Chapter 8.
Intermolecular forces
Intermolecular Forces
Agenda: Hand in your Assignment (last chance!) Check your note on 4.7
INTERMOLECULAR FORCES OF ATTRACTION
Lecture 69 Intermolecular Forces Ozgur Unal
Intermolecular forces
TOPIC 4 CHEMICAL BONDING AND STRUCTURE
Intermolecular forces
Polarity within a Molecule
I. Intermolecular Forces
Intermolecular Forces
TOPIC 4 CHEMICAL BONDING AND STRUCTURE
IONIC VS. COVALENT COMPOUNDS
Chapter 4.4: Intermolecular forces
Section 2: Intermolecular Attractive Forces
Intermolecular Forces
Intermolecular Forces
Intermolecular Forces
Intermolecular Forces
Intramolecular Forces vs. Intermolecular Forces
Intermolecular Forces
Intermolecular Forces
Forces between Particles
Intermolecular Forces
Polarity and Intermolecular Forces
Electronegativity and Polarity
Intermolecular Forces
Forces.
8.4 Bond Polarity Bonding Ionic Covalent.
Intermolecular attractions
Intermolecular Forces,
Intermolecular Forces
Intermolecular Forces of Attraction
Intermolecular Forces
Forces.
Intermolecular Forces
Intramolecular forces vs. Intermolecular forces
Intermolecular forces
Dipole Forces Main Concept:
9-9 Intermolecular Forces (IMFs) ~ (Section 14.3)
Intra vs Inter The prefix intra- means “within”
Intramolecular Forces
Polarity and Intermolecular Forces
Intermolecular Forces
Presentation transcript:

Intra vs Inter The prefix intra- means “within” The word intramural literally means “within walls”, and refers to things that occur within the walls of a school, or things that are self-contained. Intraparticle forces act within a compound, such as covalent bonds.

Intra vs Inter The prefix inter- means “between” or “among”. The internet, as I think we’re all aware, covers the globe, and anyone with a connection can access it from anywhere in the world.  Interparticle forces act between compounds, usually molecules. These are new types of forces that we will discuss today.

Three types of force can operate between covalent molecules: Interparticle Forces Three types of force can operate between covalent molecules: Dispersion Forces also known as London Forces or as van der Waal's Forces. Dipole-dipole Hydrogen bonds (special type of dipole-dipole)

Relative Strength of Intermolecular Forces: Intermolecular forces are much weaker than intramolecular forces dispersion forces are the weakest intermolecular force (one hundredth-one thousandth the strength of a covalent bond) hydrogen bonds are the strongest intermolecular force (about one-tenth the strength of a covalent bond). dispersion < dipole-dipole < hydrogen bonds

Dispersion Forces (London Forces, van der Waal's Forces) Very weak forces of attraction between molecules resulting from: momentary dipoles occurring due to uneven electron distributions in neighbouring molecules as they approach one another. the weak residual attraction of the nuclei in one molecule for the electrons in a neighbouring molecule. The more electrons that are present in the molecule, the stronger the dispersion forces will be. Dispersion forces are the only type of intermolecular force operating between non-polar molecules

Dipole-dipole Interactions Stronger intermolecular forces than Dispersion forces occur between molecules that have permanent net dipoles (polar molecules). The partial positive charge on one molecule is electrostatically attracted to the partial negative charge on a neighbouring molecule.

Hydrogen Bonds occur between polar molecules that have a permanent net dipole resulting from hydrogen being covalently bonded to either fluorine, oxygen or nitrogen. The dipole created between the hydrogen atom and the fluorine, oxygen or nitrogen atom is extremely polar. This creates a highly localized positive charge on the hydrogen atom and highly negative localized charge on the fluorine, oxygen or nitrogen atom. Responsible for high surface tension of water.

Effect of IntermolecularForces Melting and Boiling Points melting or boiling results from a weakening of the attractive forces between the molecules. the stronger the intermolecular force is, the more energy is required to melt the solid or boil the liquid.

Effect of Intermolecular Forces on Solubility In general like dissolves like: non-polar compounds dissolve in non-polar solvents polar compounds such as sugar (glucose C6H12O6) will dissolve in polar solvents such as water (H2O) ionic solutes such as sodium chloride (NaCl) will generally dissolve in polar solvents but not in non-polar solvents

Intermolecular Forces Worksheet 1) Identify the main intermolecular force in the following compounds. You must determine compound polarity first. a) PF3 _____________________________ b) H2CO ___________________________ c) HF ______________________________

Homework Read section 3.4 in the textbook to help support what we covered in class today. Summary on page 114 Page 115 #1-5