Intermolecular Forces
Chemistry ⇒ Chemical Bonding and Structure
Intermolecular Forces starts at 10 and continues till grade 12.
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See sample questions for grade 12
A solution of NaCl in water conducts electricity, but a solution of sugar in water does not. Explain why in terms of intermolecular forces.
A student observes that ethanol (C2H5OH) has a higher boiling point than dimethyl ether (CH3OCH3), even though both have the same molecular formula. Explain why.
Arrange the following compounds in order of increasing boiling point: CH4, NH3, H2O.
Describe how molecular shape affects the strength of London dispersion forces.
Describe the difference between intermolecular and intramolecular forces.
A solution of NaCl in water conducts electricity, but a solution of sugar in water does not. Explain why in terms of intermolecular forces.
A student observes that ethanol (C2H5OH) has a higher boiling point than dimethyl ether (CH3OCH3), even though both have the same molecular formula. Explain why.
A student is given two unknown liquids, X and Y. Liquid X evaporates much more quickly than liquid Y at room temperature. Suggest, with reasons, what this indicates about the relative strengths of their intermolecular forces.
Which of the following best explains why oil and water do not mix?
(1) Oil molecules are too large.
(2) Oil is nonpolar and cannot form hydrogen bonds with water.
(3) Water is denser than oil.
(4) Oil contains ions.
Which of the following is NOT a type of intermolecular force?
(1) Covalent bond
(2) Hydrogen bond
(3) Dipole-dipole interaction
(4) London dispersion force
Which of the following is the strongest type of intermolecular force?
(1) London dispersion forces
(2) Dipole-dipole interactions
(3) Hydrogen bonding
(4) Ion-dipole interactions
Which of the following molecules can form hydrogen bonds?
(1) CH4
(2) H2O
(3) HCl
(4) CO2
Fill in the blank: Hydrogen bonding occurs when hydrogen is bonded to highly electronegative atoms such as ________, oxygen, or fluorine.
Fill in the blank: The ________ the intermolecular forces, the higher the boiling point of a substance.
Fill in the blank: The ________ the molar mass of a nonpolar molecule, the stronger its London dispersion forces.
Fill in the blank: The ability of a substance to dissolve in water is often due to ________-dipole interactions.
True or False: All molecules experience London dispersion forces, regardless of their polarity.
True or False: Dipole-dipole interactions only occur between nonpolar molecules.
True or False: Dipole-induced dipole interactions can occur between a polar and a nonpolar molecule.
True or False: Ion-dipole forces are important in solutions of ionic compounds in polar solvents.
