11.4 - HEAT, INTERNAL ENERGY AND WORK
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Practice Questions
Test your understanding with targeted questions
What is heat in thermodynamics?
💡 Hint: Think about how energy moves when two objects of different temperatures are in contact.
What does internal energy refer to?
💡 Hint: Consider the molecular level of energy within a substance.
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Interactive Quizzes
Quick quizzes to reinforce your learning
Heat always flows from which to which?
💡 Hint: Think about your experiences with hot coffee or tea.
True or False: Internal energy is affected by how the energy state was achieved.
💡 Hint: Recall the definition of state variables.
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Challenge Problems
Push your limits with advanced challenges
A gas in a piston absorbs 500 J of heat and does 200 J of work. What is the change in internal energy?
💡 Hint: Use the equation ΔU = ΔQ - ΔW to guide your calculation.
If a closed system expands doing 150 J of work and there is no heat exchange with the environment, how does this affect the internal energy?
💡 Hint: Consider the relationship of work, heat, and internal energy from the First Law.
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