Practice Internal Energy (e) (1.1.1) - Unit 5: Energetics and Thermochemistry

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9 questions

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6 sample questions

Question 1.
Define internal energy.
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Think about the different types of energy involved in molecular motion.
Question 2.
What does the first law of thermodynamics state?
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Consider the implications of energy transformation in reactions.
3Question 3.
What is the correct formula for change in internal energy?
- ΔE = q - w
- ΔE = w + q
- ΔE = q + w
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Recall the precise wording of the first law.
4Question 4.
True or False: In an endothermic reaction, internal energy increases.
- True
- False
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Think about how energy flows in endothermic reactions.
Question 5.
A system absorbs 120 J of heat and does 45 J of work on the surroundings. What is the change in internal energy?
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Be careful with the signs of heat and work!
Question 6.
Explain how an exothermic reaction can decrease internal energy while achieving a net release of energy.
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Consider the flow of energy and how it affects both the system and its surroundings.

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