Practice Using Hess’s Law with Multiple Steps - 2.2.3 | Unit 5: Energetics and Thermochemistry | IB Grade 11: Chemistry
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2.2.3 - Using Hess’s Law with Multiple Steps

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What does Hess's Law state?

💡 Hint: Think of it in terms of total energy changes.

Question 2

Easy

Can we measure ΔH for a reaction directly?

💡 Hint: Consider how we can apply known values in calculating other reactions.

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 does Hess's Law allow us to do?

  • Find ΔH for unknown reactions
  • Measure temperature changes
  • Identify reactants in a reaction

💡 Hint: Think about how we can use known values to derive new properties.

Question 2

True or False: Hess's Law states that the path taken in a chemical reaction affects the total energy change.

  • True
  • False

💡 Hint: Consider the main idea behind Hess's Law.

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Challenge Problems

Push your limits with challenges.

Question 1

Using Hess’s Law, calculate the enthalpy change for the following target reaction: N₂(g) + 3H₂(g) → 2NH₃(g) from known ΔH values. Use the formation enthalpy of NH₃ and others as necessary.

💡 Hint: Make sure to balance and reverse reactions as needed for the final calculations.

Question 2

How would you determine ΔH for the reaction 2 CO(g) + O₂(g) → 2 CO₂(g) using formation enthalpies? Write out the equations and the steps you take.

💡 Hint: Ensure you understand how to balance and apply known values to formulate your solution.

Challenge and get performance evaluation