Standard Enthalpy Change of Formation Quiz
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Questions and Answers

What is the standard enthalpy change of reaction represented by?

  • ΔH° (reaction) = ΣΔHf° (p) × ΣΔHf° (r)
  • ΔH° (reaction) = ΣΔHf° (p) + ΣΔHf° (r)
  • ΔH° (reaction) = ΣΔHf° (r) - ΣΔHf° (p)
  • ΔH° (reaction) = ΣΔHf° (p) - ΣΔHf° (r) (correct)

    • What is the value of the enthalpy of formation of carbon dioxide in kJ/mol?

  • -241.8
  • -393.5 (correct)
  • -110.5
  • 0

    • What type of process is bond-breaking?

  • Isothermal
  • Endothermic (correct)
  • Exothermic
  • Isobaric

    • What is the ΔH° (reaction) value for the reaction CO (g) + H2O (g) → CO2 (g) + H2 (g)?

    <p>41.2 kJ/mol</p> Signup and view all the answers

    Under standard conditions, what is the enthalpy change of a reaction represented by?

    <p>ΔH°</p> Signup and view all the answers

    What occurs when new bonds are formed in a reaction?

    <p>Energy is released</p> Signup and view all the answers

    What is the significance of Hess's Law in measuring enthalpy changes?

    <p>It proves that the energy change in a reaction is always the same, regardless of the pathway.</p> Signup and view all the answers

    What is the unit of enthalpy change (ΔH)?

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

    Which of the following is an example of an indirect method of measuring enthalpy changes?

    <p>Hess's Law</p> Signup and view all the answers

    What is the ΔH° for the reaction 2H2(g) + O2(g) → 2H2O(g), given that H2(g) + ½O2(g) → H2O(l) ΔH° = -44kJ?

    <p>-88 kJ</p> Signup and view all the answers

    What is the difference between ΔH and ΔH°?

    <p>ΔH is for non-standard conditions, while ΔH° is for standard conditions.</p> Signup and view all the answers

    What is the heat of formation of a compound?

    <p>The enthalpy change for a reaction involving the formation of the compound from its elements.</p> Signup and view all the answers

    What is the Standard Enthalpy Change of Formation (ΔHf0) of an element in its normal physical state under standard conditions?

    <p>0</p> Signup and view all the answers

    What type of reaction is represented by the equation Mg(s) + ½ O2(g) → MgO(s)?

    <p>Formation reaction</p> Signup and view all the answers

    What is the sign of the enthalpy change (ΔH) for a reaction that releases heat?

    <p>-ve</p> Signup and view all the answers

    What is the Standard Enthalpy Change of Atomization (ΔHat0) for the reaction ½ H2(g) →H(g)?

    <p>+218 KJ/mol</p> Signup and view all the answers

    What is the Standard Enthalpy Change of Combustion (ΔHc0) for the reaction CH4 + 2O2 → CO2 + 2H2O?

    <p>-890.4 KJ/mol</p> Signup and view all the answers

    What is the characteristic of a reaction that has a positive enthalpy change (ΔH)?

    <p>Endothermic reaction</p> Signup and view all the answers

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