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.
Describe the effect of increasing temperature on the strength of intermolecular forces in a liquid.
Describe the role of intermolecular forces in determining the solubility of a substance in water.
Explain why ionic compounds generally have much higher melting points than molecular compounds.
Explain why nonpolar molecules such as O2 and N2 can be liquefied at low temperatures.
Explain why the boiling point of H2O is much higher than that of H2S.
Explain why the melting point of NaCl is much higher than that of ice (H2O).
Explain why water has a high surface tension compared to most other liquids.
Which type of intermolecular force is present in all molecular substances?
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.
Arrange the following substances in order of increasing strength of intermolecular forces: H2, NH3, NaCl. Justify your answer.
Explain why the boiling point of propan-1-ol (C3H7OH) is higher than that of butane (C4H10), even though butane has a higher molar mass.
Explain why the vapor pressure of methanol (CH3OH) is lower than that of methane (CH4) at the same temperature.
Explain, with reference to intermolecular forces, why iodine (I2) is a solid at room temperature while chlorine (Cl2) is a gas.
