2.2.2 - Implications
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Practice Questions
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What does Hess's Law state?
💡 Hint: Think about how paths in a forest can lead to the same destination.
Why is Hess's Law useful in chemistry?
💡 Hint: Consider how we can combine known equations to predict unknown properties.
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Interactive Quizzes
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What is Hess's Law?
💡 Hint: Think about how energy can be conserved regardless of the steps taken.
If a reaction is reversed, what happens to its ΔH?
💡 Hint: Reversing means considering energy to be absorbed instead of released.
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Challenge Problems
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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!
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!
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