Surface Tension

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Questions and Answers

What is the main characteristic of surface tension?

  • The ability of liquid surfaces to resist internal forces
  • The tendency of liquid surfaces to shrink into a minimum surface area (correct)
  • The tendency of liquid surfaces to expand into a maximum surface area
  • The ability of liquid surfaces to attract external forces

What is the term for the attraction between water molecules?

  • Electrolysis
  • Cohesion (correct)
  • Surface tension
  • Adhesion

What is the primary function of surfactants?

  • To increase surface tension
  • To increase the viscosity of a liquid
  • To decrease surface tension (correct)
  • To change the pH of a solution

What is the characteristic of non-ionic surfactants?

<p>They are compatible with anionic and cationic S.A.A. (B)</p> Signup and view all the answers

What is the disadvantage of anionic surfactants?

<p>They are not suitable for oral use due to unpleasant taste and irritant action to the mucosa (A)</p> Signup and view all the answers

What is the term for surfactants that have both polar and non-polar groups?

<p>Amphiphilic (A)</p> Signup and view all the answers

What is the critical micelle concentration (CMC) of a surfactant?

<p>The lowest concentration at which micelles first appear (C)</p> Signup and view all the answers

What happens to the solubility of surfactants when the temperature is increased?

<p>It increases slowly until the Kraft point, then increases rapidly (C)</p> Signup and view all the answers

What is the term for the temperature at which the solubility of surfactants increases rapidly?

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

What is the property of surfactants that allows them to increase the solubility of organic compounds in aqueous systems?

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

Where are non-polar materials such as aliphatic hydrocarbons dissolved in micelles?

<p>In the non-polar cores of the micelles (C)</p> Signup and view all the answers

What is the term for the concentration of surfactants in solution at the Kraft point?

<p>CMC at the Kraft temperature (A)</p> Signup and view all the answers

What is the purpose of surface active agents in medical applications?

<p>As antimicrobials, expectorants, and cleansing agents (D)</p> Signup and view all the answers

What is the opposite of sorption?

<p>Desorption (A)</p> Signup and view all the answers

What is the type of adsorption that occurs due to chemical combination of adsorbate molecules and the surface molecules of adsorbent?

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

What happens to adsorption when the particle size of the adsorbent is reduced?

<p>Adsorption increases (B)</p> Signup and view all the answers

What is the nature of most adsorption processes?

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

What factor affects adsorption, where an increase in solute concentration leads to an increase in adsorption up to a limited value?

<p>Solute concentration (D)</p> Signup and view all the answers

What is the effect of increase in temperature on the amount of adsorption?

<p>It decreases the amount of adsorption. (B)</p> Signup and view all the answers

What is the reason for the increase in adsorption with the increase in molecular weight of solutes?

<p>Due to increase in Van Der Waals forces of attraction. (B)</p> Signup and view all the answers

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