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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does a negative 1H indicate?
💡 Hint: Think about heat exchange in that reaction.
Question 2
Easy
Define a thermochemical equation.
💡 Hint: It involves both reactants and energy.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What does a positive 1H signify in a chemical reaction?
- Exothermic reaction
- Endothermic reaction
- No heat change
💡 Hint: Think about whether the system is taking in or giving out energy.
Question 2
True or False: Hess's Law can be applied to calculate enthalpy changes for reactions occurring in multiple steps.
- True
- False
💡 Hint: Remember how you can break down tasks to find total effort.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
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.
Question 2
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.
Challenge and get performance evaluation