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3 cards from this section. Quick, good the night before a test.
What is the formula for calculating enthalpy change?
Think about how you find the difference between the two energies.
Is an exothermic reaction associated with a positive or negative ΔH?
Recall which type of reaction releases energy.
What does a negative ΔH signify?
Think of the implications of energy flow.
Which equation correctly expresses enthalpy change for a reaction?
Look for the structure of the formula!
If a reaction shows a ΔH of -75 kJ, what can you conclude about the energy exchange, and how would you categorize the reaction?
Reflect on the meaning of a negative ΔH.
Given a total energy of reactants at 120 kJ and products at 50 kJ, calculate ΔH and classify the reaction.
Use the formula and remember the classification rules.
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