22 Thermochemistry: MCQ3
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Questions and Answers

What is the fundamental principle of Hess's Law?

  • The heat change of a reaction depends only on the initial and final states of a reaction (correct)
  • The heat change of a reaction depends on the catalyst used
  • The heat change of a reaction depends on the route by which the reaction occurs
  • The heat change of a reaction depends on the pressure of the system

What is the process of converting straight chain compounds to ring compounds?

  • Catalytic cracking
  • Dehydrocyclisation (correct)
  • Electrolysis
  • Isomerisation

What is the by-product of the electrolysis of water?

  • Carbon dioxide and hydrogen
  • Oxygen and hydrogen (correct)
  • Hydrogen and methane
  • Methane and oxygen

What is the purpose of improving the octane number of a fuel?

<p>To improve the fuel's combustion efficiency (D)</p> Signup and view all the answers

What is the primary goal of catalytic cracking?

<p>To produce smaller molecules with higher octane numbers (B)</p> Signup and view all the answers

What is the main reactant in the steam reforming process?

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

What is the product of the reaction CO + H₂O →?

<p>COâ‚‚ + Hâ‚‚ (C)</p> Signup and view all the answers

What is the sign of ∆H for an exothermic reaction?

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

What is the octane number a measure of?

<p>The tendency of a fuel to resist auto-ignition (A)</p> Signup and view all the answers

What is the unit of bond energy?

<p>Kilojoules per mole (A)</p> Signup and view all the answers

What is the Law of Conservation of Energy?

<p>Energy cannot be created or destroyed, but can change from one form to another (B)</p> Signup and view all the answers

What is the heat of combustion of a substance?

<p>The heat change when one mole of the substance is completely burned in excess oxygen (D)</p> Signup and view all the answers

What is the kilogram calorific value of a fuel?

<p>The heat energy produced per kilogram of fuel (B)</p> Signup and view all the answers

What is the heat of formation of a substance?

<p>The heat change when one mole of the substance is formed from its elements in their standard states (D)</p> Signup and view all the answers

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