Practice Bond Enthalpy Basics - 3.1 | Unit 5: Energetics and Thermochemistry | IB Grade 11: Chemistry
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3.1 - Bond Enthalpy Basics

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What is bond enthalpy?

💡 Hint: Think about what happens when you break a bond.

Question 2

Easy

Why do bond enthalpy values vary?

💡 Hint: Consider different molecules containing the same type of bond.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What is bond enthalpy?

  • Energy released when bonds form
  • Energy required to break a bond
  • The energy of molecules at absolute zero

💡 Hint: Consider what happens when you need to separate atoms in a bond.

Question 2

Is ΔH positive or negative for an exothermic reaction?

  • True
  • False

💡 Hint: Think about how energy flows in an exothermic process.

Solve and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Estimate the reaction enthalpy for the combustion of butane: C₄H₁₀(g) + 6 O₂(g) → 4 CO₂(g) + 5 H₂O(g), given average bond enthalpies: C–C = 347 kJ/mol, C–H = 413 kJ/mol, O=O = 498 kJ/mol.

💡 Hint: Ensure you breaking down every bond energy clearly for products and reactants!

Question 2

Calculate the total energy change of the hydrogenation reaction of a diene compound with given bond enthalpies. Analyze why this estimate might deviate from actual values due to molecular geometry.

💡 Hint: Pay attention to bond type changes during hydrogenation and apply realistic bond strength corrections.

Challenge and get performance evaluation