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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does Hess's Law state?
💡 Hint: Think about how paths in a forest can lead to the same destination.
Question 2
Easy
Why is Hess's Law useful in chemistry?
💡 Hint: Consider how we can combine known equations to predict unknown properties.
Practice 3 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 Hess's Law?
- The total enthalpy change is path-dependent
- The total enthalpy change is path-independent
- It only applies to exothermic reactions
💡 Hint: Think about how energy can be conserved regardless of the steps taken.
Question 2
If a reaction is reversed, what happens to its ΔH?
- True
- False
💡 Hint: Reversing means considering energy to be absorbed instead of released.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Given the reactions: A + B → C (ΔH = -40 kJ) and C + D → E (ΔH = -60 kJ). Find ΔH for the overall reaction: A + B + D → E.
💡 Hint: Combine the enthalpy changes directly; balancing is taken care of in the equation!
Question 2
A formation reaction: 3 H₂ + N₂ → 2 NH₃ (ΔH = -92 kJ). If we reverse this equation for calculating ΔH of decomposition, what will be the resulting enthalpy?
💡 Hint: Remember that reversing a reaction changes the context of energy transfer!
Challenge and get performance evaluation