Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Define enthalpy.
💡 Hint: Think about heat content related to pressure.
Question 2
Easy
What does it mean if a reaction is exothermic?
💡 Hint: Remember the heat flow direction.
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Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the enthalpy change for an exothermic reaction?
- ΔH < 0
- ΔH > 0
- ΔH = 0
💡 Hint: Consider the heat flow direction.
Question 2
True or False: Standard enthalpy of formation for an element in its standard state is zero.
- True
- False
💡 Hint: Think about formation and its relation to enthalpy.
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Challenge Problems
Push your limits with challenges.
Question 1
Given the following reaction: C(graphite) + O₂(g) → CO₂(g), calculate the standard enthalpy change if ΔH_f°(C(graphite)) = 0 kJ mol⁻¹ and ΔH_f°(O₂(g)) = 0 kJ mol⁻¹, and ΔH_f°(CO₂(g)) = -393.5 kJ mol⁻¹.
💡 Hint: Use the enthalpy of formation values provided.
Question 2
If a calorimeter reads an initial temperature of 20°C and after a reaction, it reads 25°C with 100g of water, how much heat was absorbed?
💡 Hint: Convert between different units if necessary.
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