Chemical Kinetics and Reaction Mechanisms Quiz
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Questions and Answers

Which assessment task is worth the highest proportion of the total assessment?

  • Midterm exam
  • Lab
  • Final exam (correct)
  • Class activates

Why don't we see diamonds in jewelry turning into graphite, even though the reaction happens?

  • The reaction is not favorable
  • The reaction is not spontaneous
  • The reaction occurs too fast
  • The reaction occurs too slow (correct)

What is the value of ΔG for the reaction diamond → graphite mentioned in the text?

  • 2.9 kJ
  • 0 kJ
  • -2.9 kJ (correct)
  • Unknown

What does thermodynamics tell us about reactions?

<p>All of the above (D)</p> Signup and view all the answers

Does a spontaneous reaction always occur fast?

<p>No (B)</p> Signup and view all the answers

What is the proportion of the total assessment for the midterm exam?

<p>20% (D)</p> Signup and view all the answers

What is the proportion of the total assessment for the final exam?

<p>40% (A)</p> Signup and view all the answers

Which assessment task is worth the lowest proportion of the total assessment?

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

What is the topic of the course CHEM402?

<p>Chemical Kinetics and Reaction Mechanisms (D)</p> Signup and view all the answers

Why does the reaction diamond → graphite occur very slowly?

<p>The reaction has a very small ΔG (C)</p> Signup and view all the answers

Flashcards

Final Exam Weight

The final exam contributes the most to the overall grade, accounting for 40% of the total assessment.

Diamond to Graphite Conversion

Despite diamond being the thermodynamically favored product, its transformation to graphite is practically unobservable because the reaction proceeds incredibly slowly due to a very high activation energy.

ΔG of Diamond to Graphite

The change in Gibbs Free Energy (ΔG) for the conversion of diamond to graphite is -2.9 kJ, which is a negative value, indicating that the reaction is thermodynamically favorable, meaning it will spontaneously proceed towards graphite.

Thermodynamics: Reaction Insights

Thermodynamics provides insights into feasibility (whether a reaction can happen) and energy changes associated with a reaction. It gives us the direction and likelihood of a reaction proceeding.

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Spontaneity vs. Rate

Spontaneous reactions, while favored by thermodynamics, don't always happen quickly. The rate of a reaction is determined by kinetics, not just thermodynamics.

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Midterm Exam Weight

The midterm exam contributes 20% of your final grade.

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Class Activity Weight

Class activities, like quizzes, group work, and discussions, are assigned the smallest weight in the course, contributing less than both the midterm and final exams.

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CHEM402: Course Topic

CHEM402 explores the principles of chemical kinetics, the study of reaction rates and mechanisms, providing a deeper understanding of how chemical reactions occur.

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Slow Diamond to Graphite Conversion

The diamond to graphite reaction has a very small Gibbs Free Energy (ΔG), meaning it's thermodynamically favorable. However, it proceeds extremely slowly due to extremely high activation energy needed to break the strong C-C bonds in diamond.

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Activation Energy of Diamond to Graphite

The activation energy for the reaction diamond → graphite is very high, leading to a very slow reaction rate.

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