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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the definition of enthalpy?
💡 Hint: Think about what heat content represents in thermodynamics.
Question 2
Easy
What does a negative ΔH indicate?
💡 Hint: Remember 'E for Exit' related to heat leaving the system.
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 the enthalpy change for an exothermic reaction?
- Positive
- Negative
- Zero
💡 Hint: Think about the direction of heat flow.
Question 2
Hess's Law states that the total enthalpy change is the same regardless of the pathway taken. (True/False)
- True
- False
💡 Hint: Consider how you can break down reactions into steps.
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Using standard enthalpies of formation, calculate the enthalpy change for the reaction of carbon, hydrogen, and oxygen forming glucose: C(s) + H₂(g) + O₂(g) → C₆H₁₂O₆(s). Given values: ΔH_f°(C) = 0, ΔH_f°(H₂) = 0, ΔH_f°(O₂) = 0, ΔH_f°(C₆H₁₂O₆) = -1273 kJ/mol.
💡 Hint: Sum the formation enthalpies of products and subtract the reactants.
Question 2
Estimate the ΔH for the reaction: C₂H₄(g) + H₂(g) → C₂H₆(g) using bond enthalpies. Given values: C=C = 611 kJ/mol, C-H = 412 kJ/mol.
💡 Hint: List all bonds involved and their bond enthalpy values.
Challenge and get performance evaluation