Practice Internal Energy (u) (6.3) - Chemical Thermodynamics

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6 sample questions

Question 1.
What does internal energy (U) represent?
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Think about kinetic and potential energy.
Question 2.
Can changes in internal energy be measured directly?
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Consider how we gather information in experiments.
3Question 3.
What represents the total energy in a system?
- Internal energy (U)
- Enthalpy (H)
- Work (W)
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Focus on the definition of internal energy.
4Question 4.
In an exothermic reaction, does the internal energy increase or decrease?
- True
- False
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Think about energy flow in reactions.
Question 5.
A closed container of gas absorbs 250 J of heat and does 50 J of work on its surroundings. Calculate the change in internal energy.
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Recall the formula and substitute Q and W values carefully.
Question 6.
If a reaction occurs in an isolated system where the initial internal energy is 500 J and the final internal energy is 450 J, how much work was done by the system if no heat was exchanged?
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Use the change in internal energy to find the work done.

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