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4 cards from this section. Quick, good the night before a test.
What does Hess's Law state?
Think about steps in a journey.
What happens to ΔH when you reverse a reaction?
Consider it like undoing something!
Hess's Law states that the total enthalpy change is dependent on:
Remember, it's all about the start and finish!
True or False: The enthalpy change of a reaction is always positive.
Think about heat absorption and release.
Given the enthalpy changes for the following reactions: 1) C + O₂ → CO₂, ΔH = -393.5 kJ; 2) CO + ½O₂ → CO₂, ΔH = -283.0 kJ, calculate the ΔH for the reaction C + ½O₂ → CO.
Pay close attention to the coefficients and how they affect enthalpy.
If you find the ΔH for the formation of a compound from its elements is unknown, how would you use Hess's Law to find it?
Look for routes that include your desired reactants and products.
5 more questions in this section. Enroll free to practise them all.
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