CHMA10H3 Lecture Notes - Lecture 24: Surface Tension, Emulsion, Capillary Action

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CHMA10H3 Full Course Notes

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Intramolecular bonds are the forces present between atoms, within a molecule. (ionic, covalent, metallic bonding) Intermolecular bonds are the forces present between molecules. There are 3 types of intermolecular bonds: dipole-dipole force (ddf, london dispersion force (ldf)/van der waals forces, hydrogen bonds. This is the force of attraction between polar molecules. The negative end of one molecule is attracted to the positive end of another. This is the force of attraction between non-polar molecules as a result of a temporary imbalance in charge. These temporary imbalances make the molecules appear momentarily polar. Hydrogen bonding occurs between polar molecules that contain h-f, h-cl, h-o, or h-n bonds. The hydrogen of a molecule forms a direct bond with the f, o, cl or n of the neighboring molecule. Of the three intermolecular forces, h-bonding is the strongest, while ldf is much weaker. Molecules with strong intermolecular forces demonstrate high surface tension.

Related Questions

Choose the wrong statement about intermolecular forces.

Choose an answer

A. The attractions due to the induced dipoles and instantaneous dipole results in London dispersion forces.

B. The weakest force of attraction among the intermolecular forces is van der Waal's forces.

C. Dipole dipole attractions are seen in polar molecules.

D. Hydrogen bond is not an intermolecular attractive force in which hydrogen atom bonds to electronegative atoms of same or different molecules.

lilacwildebeest946

Draw the best Lewis structure for CH₂F₂. Which of the following is/are true?

A. CH₂F₂ is nonpolar

B. There are dispersion forces between two CH₂F₂ molecules

C. There are dipole-dipole forces between two CH₂F₂ molecules

D. There is hydrogen bonding between two CH₂F₂ molecules

E. The strongest intermolecular force between two CH₂F₂ molecules is ion-dipole forces

F. CH₂F₂ should have a lower boiling point than CH₄

G. The molecular geometry for CH₂F₂ is tetrahedral

Which of the following is/are true?

A. SF₄ is a polar molecule and has a seesaw molecular geometry

B. The strongest intermolecular force in KBr(aq) is ion-dipole forces

C. BF₃ is a nonpolar molecule and has a trigonal planar molecular geometry

D. CH₃CHO is polar; there are dipole-dipole forces and dispersion forces between two CH₃CHO molecules, but no hydrogen bonding

amaranthduck153

Water has a higher boiling point than hydrogen fluoride because it can participate in more hydrogen bonding. What is the maximum number of hydrogen bonds in which a water molecule could theoretically participate?

		2
		3
		4
		5
		6

QUESTION 2

What statement best describes London (also called dispersion) forces?

		They are only present in non-polar substances.
		They are the most important type of intermolecular force in water.
		They are present in every substance, but often become irrelevant in very polar materials.
		They are only present in atoms such as Helium or Argon.

CHMA10H3 Lecture Notes - Lecture 24: Surface Tension, Emulsion, Capillary Action

CHMA10H3 Full Course Notes

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