Unit 6.9: Hess’s Law
Identify a valid series of steps for an overall process, considering
stoichiometry and energy change.
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Determine which sequence of reactions correctly represents an overall
reaction.
- Explain how ∆H of steps combines to give overall ∆H.
Manipulate reaction steps to match an overall process and calculate ∆H.
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Reverse or multiply reactions to match a target equation and calculate
∆H.
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Show how multiplying a reaction by 2 affects its enthalpy change.
Use Hess’s law results to justify the overall sign of a process, even if
component steps have different signs.
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Given reactions with mixed ∆H signs, determine overall ∆H using Hess’s
law.
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Explain why the overall process can be exothermic even if some steps
are endothermic.