3.4 - Activation Energy
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Practice Questions
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Define activation energy.
💡 Hint: Think about the energy barrier that needs to be overcome.
What happens if the activation energy is high?
💡 Hint: Consider how it relates to the energy needed for molecules to react.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is activation energy?
💡 Hint: Think of it as the energy barrier that needs to be crossed for a reaction to occur.
True or False: A lower activation energy leads to slower reaction rates.
💡 Hint: Consider how the energy of molecules impacts movement and reaction rates.
2 more questions available
Challenge Problems
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If the activation energy for a particular reaction is 75 kJ/mol at 298 K, how would a temperature increase from 298 K to 308 K affect the rate constant, assuming it follows the Arrhenius equation? Use values where relevant.
💡 Hint: Use R = 8.314 J/mol·K for calculations.
A reaction without a catalyst has an activation energy of 100 kJ/mol, while a catalyzed pathway requires only 50 kJ/mol. Compare the expected rates of these two reactions at 298 K.
💡 Hint: Considering how much more accessible the catalyzed pathway makes the reaction is key!
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