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Surface Chemistry
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Surface Chemistry

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Questions and Answers

Which of the following statements about adsorption is NOT TRUE?

  • Adsorption leads to a lower concentration of molecules on the surface. (correct)
  • Adsorption is rapid in the beginning and slows down near equilibrium.
  • Adsorption is a surface phenomenon.
  • Adsorption results in a higher concentration of molecules on the surface.

    • What is the primary cause of adsorption?

  • van der Waals forces between molecules and surface.
  • Unbalanced forces of attraction or free valencies on the surface. (correct)
  • Hydrogen bonding between molecules and surface.
  • Electrostatic forces between molecules and surface.

    • What is the characteristic of the concentration of adsorbed molecules during adsorption?

  • It is uniform throughout the surface.
  • It reaches a plateau at equilibrium.
  • It decreases with time.
  • It is always greater at the surface than in the bulk. (correct)

    • What is the term for the branch of physical chemistry that deals with the nature of surfaces and chemical and physical processes on surfaces?

    <p>Surface Chemistry</p> Signup and view all the answers

    What is an example of adsorption?

    <p>Water vapors adsorbed by silica gel.</p> Signup and view all the answers

    What is the minimum size of the particles that can form micelles?

    <p>less than 1 nm</p> Signup and view all the answers

    What is the process by which oxygen or other oxidizing agents can be used to obtain a colloidal solution of sulphur?

    <p>Oxidation</p> Signup and view all the answers

    What is the term for the temperature above which the formation of micelles takes place?

    <p>Kraft temperature</p> Signup and view all the answers

    What is the characteristic of micelles that enables them to form ions?

    <p>Their ability to dissociate</p> Signup and view all the answers

    What is the maximum number of molecules that can be present in a micelle?

    <p>100 molecules</p> Signup and view all the answers

    What is the primary reason for the increase in the tendency of adsorption when a solid substance is broken into two pieces?

    <p>Increase in the unbalanced forces on the surface atoms</p> Signup and view all the answers

    What is the characteristic of an adsorption process that is accompanied by a decrease in the free energy change of the system?

    <p>Spontaneous adsorption</p> Signup and view all the answers

    What type of adsorption occurs when a gas is adsorbed on a solid surface and can be completely removed in vacuum?

    <p>Reversible adsorption</p> Signup and view all the answers

    What is the role of surface atoms in adsorption?

    <p>They play an active role in adsorption</p> Signup and view all the answers

    What is the term for the existence of a higher concentration of a particular component at the surface of a liquid or a solid phase?

    <p>Adsorption</p> Signup and view all the answers

    What is the primary function of enzymes in biological systems?

    <p>To catalyze numerous reactions</p> Signup and view all the answers

    What is the term used to describe enzymes that catalyze biochemical reactions?

    <p>Biochemical catalysts</p> Signup and view all the answers

    Which of the following enzymes is involved in the breakdown of starch?

    <p>Diastase</p> Signup and view all the answers

    What is the general composition of enzymes?

    <p>Complex nitrogenous substances</p> Signup and view all the answers

    What is the role of Zymase in biochemical reactions?

    <p>To catalyze fermentation reactions</p> Signup and view all the answers

    What type of catalysis involves a catalyst and reactants in different phases?

    <p>Heterogeneous catalysis</p> Signup and view all the answers

    What is the term for a catalyst that accelerates the rate of a chemical reaction and is also a product of the reaction?

    <p>Auto-catalyst</p> Signup and view all the answers

    What is the process in which one reaction influences the rate of another reaction that does not occur under ordinary conditions?

    <p>Induced catalysis</p> Signup and view all the answers

    What is the role of Mn²⁺ ions in the reaction?

    <p>Act as a catalyst</p> Signup and view all the answers

    What is the purpose of Pt(s) in the contact process for H₂SO₄?

    <p>To act as a catalyst</p> Signup and view all the answers

    What is the primary function of nitrogenase in leguminous plants?

    <p>To convert atmospheric N2 to NH3</p> Signup and view all the answers

    Which enzyme is responsible for catalyzing the reaction of CO2 with H2O in the human body?

    <p>Carbonic anhydrase</p> Signup and view all the answers

    What is the characteristic feature of zeolites that permits cavities of different sizes?

    <p>The openness of the structure</p> Signup and view all the answers

    What is the primary factor that determines the reaction-selectivity of zeolites?

    <p>The size of the cavities</p> Signup and view all the answers

    What is the function of invertase in the manufacturing of ethyl alcohol?

    <p>To catalyze the hydrolysis of sucrose into glucose and fructose</p> Signup and view all the answers

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