5.4.4 - Thermochemical Equations
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Practice Questions
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What does a negative 1H indicate?
💡 Hint: Think about heat exchange in that reaction.
Define a thermochemical equation.
💡 Hint: It involves both reactants and energy.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does a positive 1H signify in a chemical reaction?
💡 Hint: Think about whether the system is taking in or giving out energy.
True or False: Hess's Law can be applied to calculate enthalpy changes for reactions occurring in multiple steps.
💡 Hint: Remember how you can break down tasks to find total effort.
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Challenge Problems
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Calculate the enthalpy change for the reaction when burning 1 mole of propane (C3H8) if the 1H is given as -1040 kJ/mol. Write the thermochemical equation.
💡 Hint: Focus on the reaction's products and energy release.
Apply Hess's Law to find the enthalpy change for the reaction: A → B with 1H1 = -50 kJ and B → C with 1H2 = 70 kJ. What is the enthalpy for A → C?
💡 Hint: Remember to add the heats based on the direction of each step.
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