Intermolecular Forces Quiz

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Questions and Answers

Which intermolecular force specifically involves the attraction between a partially positive charged hydrogen atom and a lone pair of electrons from a highly electronegative atom?

  • Hydrogen bonds (correct)
  • Dipole-Dipole interactions
  • London dispersion forces
  • Vapor pressure

What is the phenomenon where liquid molecules escape into the gaseous state at the surface called?

  • Condensation
  • Capillary action
  • Viscosity
  • Evaporation (correct)

What is the unit of viscosity in the SI system of measurement?

  • $Jmol^{-1}$
  • $Nsm^{-2}$ (correct)
  • kg/m$^3$
  • $Nm^{-1}$

What type of intermolecular force occurs among nonpolar molecules like H$_2$, He, and Ne?

<p>London dispersion forces (D)</p> Signup and view all the answers

At what temperature does the vapor pressure of a liquid equal the atmospheric pressure?

<p>Boiling point (C)</p> Signup and view all the answers

What is the reverse process of evaporation where gas molecules transform into liquid state?

<p>Condensation (C)</p> Signup and view all the answers

What determines the energy required to stretch the surface of a liquid by unit area?

<p>Surface tension (B)</p> Signup and view all the answers

Which phenomenon involves the rise of water in a capillary tube due to its small surface area?

<p>Capillary action (D)</p> Signup and view all the answers

Which heat quantity is needed to convert one mole of solid completely into liquid at its melting point?

<p>Molar heat of fusion (B)</p> Signup and view all the answers

What causes abnormal behavior in water below $4^\circ$C?

<p>Hydrogen bonds (C)</p> Signup and view all the answers

Flashcards

Hydrogen bonds

Attraction between a partially positive hydrogen and a lone pair on a highly electronegative atom (O, N, F).

Evaporation

The process where liquid molecules turn into gas at the liquid's surface.

Nsm⁻²

The SI unit for viscosity, measuring a fluid's resistance to flow.

London dispersion forces

Weak, short-range attractions between all atoms and molecules, caused by instantaneous polarization.

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Boiling point

The temperature at which a liquid's vapor pressure equals the surrounding atmospheric pressure, allowing it to vaporize.

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Condensation

The phase change from gas to liquid.

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Surface tension

Energy required to increase the surface area of a liquid.

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Capillary action

The ability of a liquid to flow in narrow spaces due to surface tension.

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Molar heat of fusion

The amount of heat required to melt one mole of a solid at its melting point.

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Water's behavior below 4°C

Water is densest at 4°C; below this temp, hydrogen bonds cause it to expand, reducing its density and causing ice to float.

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