Multiple Points each) 9) The first law of thermodynamics A) defines chemical ene
ID: 525263 • Letter: M
Question
Multiple Points each) 9) The first law of thermodynamics A) defines chemical energy. B) defines entropy. C) is a statement of conservation of energy D) provides a criterion for the spontaneity of a reaction. 10) Which is a measure of the sum ofthe kinetic and potential energies of each particle in the system? A) E, the internal energy B) G, the Gibbs free energy C H, the enthalpy D) the temperature 11) What is expected when the reaction shown below takes place in a thermally-insulated container outfitted with a movable piston at a constant atmospheric pressure of 1 atm? 2 C2H60g) 7 o20g) 4 CO20g) 6 H2O(g) A) Volume will decrease and work will be done by the system. B) Volume will decrease and work will be done on the system. C) Volume will increase and work will be done by the system. D) Volume will decrease and work will be done on the system. 12) Which is expected to have the lowest specific heat capacity at 25°C? A) air B) copper D) water 13) Which combination always results in a reaction being spontaneous? A) AH is negative and AS is negative. B) AH is negative and AS is positive. C) AH is positive and AS is negative. D) AH is positive and AS is positive.Explanation / Answer
9. C . The first law of thermodynamics is basically a restatement of law of conservation of energy
10. A
11. C. There is an increase in the number of moles in the product side as compared to reactants.
12. C. Cu is a metal and hence has the lowest heat capacity.
13. B. G = H-TS (For negative H and positive S, the G is negative, which is the requirement for a spontaneous process.
14. C: Pressure is inversly proportional to V or PV = constant
15. A
16. C. Green house effect is the major cause of global warming
17. A: CO2 contributes maximum to the global warming.
18. A: For a given temperature, the molecular speed depends on the molecular mass. Lower the mass, higher the speed. In the given options CO2 has the least mass.
19. D
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