Practice Practice Problems for Section 1 - 1.7 | Unit 5: Energetics and Thermochemistry | IB Grade 11: Chemistry
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1.7 - Practice Problems for Section 1

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

Determine if the following reaction is exothermic or endothermic: H₂(g) + ½ O₂(g) → H₂O(l).

💡 Hint: Refer to the standard enthalpy of formation values.

Question 2

Easy

Identify the enthalpy of formation for CO₂(g).

💡 Hint: Standard formation values should be in reference tables.

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 type of reaction occurs if ΔH is negative?

  • Exothermic
  • Endothermic
  • Isothermal
  • Isobaric

💡 Hint: Think about the definitions of exothermic and endothermic reactions.

Question 2

Do standard enthalpies of formation apply to reactions at any temperature?

  • True
  • False

💡 Hint: Consider what 'standard conditions' means in thermochemistry.

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Challenge Problems

Push your limits with challenges.

Question 1

Calculate the enthalpy change for the reaction: 2 H₂(g) + O₂(g) → 2 H₂O(g). Given ΔH_f°[H₂O(g)] = -241.8 kJ/mol.

💡 Hint: Use the standard enthalpy of formation for water and apply the equation properly.

Question 2

Using Hess's Law, determine the enthalpy change for the combustion of 1 mole of C2H6(g) given the following equations: ΔH for C2H6(g) → 2C(s) + 3H2(g) and C(s) + O2(g) → CO2(g) with their respective ΔH values.

💡 Hint: Remember to reverse any equations if necessary and change the sign of the enthalpy.

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