The first law of thermodynamics A) defines chemical energy. B) defines entropy.

Question

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. Which is a measure of the sum of the 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) T, the temperature 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 C_2H_6(g) + 7 O_2(g) rightarrow 4 CO_2 (g) + 6 H_2 O(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. Which is expected to have the lowest specific heat capacity at 25 degree C? A) air B) copper C) polyethylene D) water Which combination always results in a reaction being spontaneous? A) delta H is negative and delta S is negative. B) delta H is negative and delta S is positive. C) delta H is positive and delta S is negative. D) delta H is positive and delta S is positive.

Explanation / Answer

9)

The statement of first law of thermodynamics is,

Q = U + W

which says that the heat provided to a system is equal to the sum of change in internal energy of the system and the work done by the system.

So the statement is simply a statement of conservation of energy. The heat energy provided is being utilized fully to increase the internal energy and doing work.

So, the correct option is C)

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