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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Define internal energy.
💡 Hint: Think about the different types of energy involved in molecular motion.
Question 2
Easy
What does the first law of thermodynamics state?
💡 Hint: Consider the implications of energy transformation in reactions.
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 is the correct formula for change in internal energy?
- ΔE = q - w
- ΔE = w + q
- ΔE = q + w
💡 Hint: Recall the precise wording of the first law.
Question 2
True or False: In an endothermic reaction, internal energy increases.
- True
- False
💡 Hint: Think about how energy flows in endothermic reactions.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A system absorbs 120 J of heat and does 45 J of work on the surroundings. What is the change in internal energy?
💡 Hint: Be careful with the signs of heat and work!
Question 2
Explain how an exothermic reaction can decrease internal energy while achieving a net release of energy.
💡 Hint: Consider the flow of energy and how it affects both the system and its surroundings.
Challenge and get performance evaluation