Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the definition of enthalpy?
π‘ Hint: Think about what heat content represents in thermodynamics.
Question 2
Easy
What does a negative ΞH indicate?
π‘ Hint: Remember 'E for Exit' related to heat leaving the system.
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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
π‘ 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
π‘ Hint: Consider how you can break down reactions into steps.
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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) + Hβ(g) + Oβ(g) β CβHββOβ(s). Given values: ΞH_fΒ°(C) = 0, ΞH_fΒ°(Hβ) = 0, ΞH_fΒ°(Oβ) = 0, ΞH_fΒ°(CβHββOβ) = -1273 kJ/mol.
π‘ Hint: Sum the formation enthalpies of products and subtract the reactants.
Question 2
Estimate the ΞH for the reaction: CβHβ(g) + Hβ(g) β CβHβ(g) using bond enthalpies. Given values: C=C = 611 kJ/mol, C-H = 412 kJ/mol.
π‘ Hint: List all bonds involved and their bond enthalpy values.
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