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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does a negative ΔH_rxn° indicate?
💡 Hint: Think about whether heat is being released or absorbed.
Question 2
Easy
What is ΔH_f°?
💡 Hint: Remember it involves the formation of one mole from elements.
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 a positive value of ΔH_rxn° indicate?
- Exothermic Reaction
- Endothermic Reaction
- Neutral Reaction
💡 Hint: Consider if the reaction is taking in energy.
Question 2
Is Hess's Law applicable for reactions involving multiple steps?
- True
- False
💡 Hint: Recall if the overall change remains constant.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Using Hess's Law, derive the enthalpy change for the combustion of ethane using the known enthalpy values of related reactions.
💡 Hint: Remember to reverse or scale reactions for accurate summation.
Question 2
Given ΔH_f° for potassium chloride (KCl), calculate the ΔH for dissolving it in water by linking it to its formation reactions.
💡 Hint: Consider the energy change when going from solid to ions in solution.
Challenge and get performance evaluation