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Intermolecular Forces

Chemistry ⇒ Chemical Bonding and Structure

Intermolecular Forces starts at 10 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Intermolecular Forces. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 11
A solution contains NaCl dissolved in water. Which type of intermolecular force is primarily responsible for the interaction between Na+ ions and water molecules?
A student observes that ethanol (C2H5OH) mixes well with water but hexane (C6H14) does not. Explain this observation in terms of intermolecular forces.
Describe how molecular size affects the strength of London dispersion forces.
Describe how the shape of a molecule can affect its intermolecular forces and physical properties.
Describe the difference between intermolecular and intramolecular forces.
Explain why iodine (I2) is a solid at room temperature while chlorine (Cl2) is a gas, even though both are halogens.
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 H2O.
Which type of intermolecular force is primarily responsible for the solubility of ionic compounds in water?
A sample of liquid X has a much higher surface tension than liquid Y, even though both are nonpolar. Suggest a molecular explanation for this observation.
A student claims that all molecules with hydrogen atoms can form hydrogen bonds. Is this statement true or false? Justify your answer.
Consider the following scenario: A nonpolar gas is compressed at low temperature, and it condenses into a liquid. Which type of intermolecular force is responsible for this phase change?
Explain how the presence of a permanent dipole in a molecule affects its solubility in water.
Explain why the boiling point of dimethyl ether (CH3OCH3) is lower than that of ethanol (C2H5OH), even though both have similar molar masses.
Rank the following substances in order of increasing boiling point and justify your answer based on the types and strengths of intermolecular forces present: methane (CH4), ammonia (NH3), and hydrogen fluoride (HF).