Question

Pchem help!

Multiple Choice Circle the correct answer. (1 pt each) 1. Two gases at the same temperature must have the same: a pressure b. volume c number of molecules d. kinetic energy per molecule e. more than one of these 2. A match is placed in an oxygen-filled cylinder that has a fixed volume. As the match burns, the chamber heats rapidly. What kind of change is demonstrated in this process? a. an isenthalpic change b. an adiabatic change d. an isochoric change c. an isothermal change 3. The van der Waals equation of state is -the acan be interpreted as arising from: nRT n V-nb V2 a. relative attractive forces between molecules b. relative repulsive forces between molecules c. strength reduction of collisions with walls for real gases d. reduced frequency of collisions with walls for real gases e. all of the above 4. In Kinetic Molecular Theory, the effect on the distribution of speeds if the molecular masses were suddenly lowered would be a. the same as lowering the temperature b. to narrow the distribution c to widen the distribution d. to have no effect at all 5. Thermodynamically, a process is called irreversible because it: a. is spontaneous, but in the reverse direction b. is near equilibrium at all points during the process c. cannot be reversed without adding matter and energy (e.g. not combustion) d. none of the above

Answer 1

(1) Two gases at the same temperature mest have the same kinetic energy per molecule.

Explanation :-

(a) Pressure depends upon both temperature and molar volume (R is the gas constant) so, two gases may not have the same molar volume at same T. Their pressure must differ.

Two gases may have differentt n, p at same T.

(b) is not a correct option.

(c) Number of molecules depends upon the number of moles taken of gas. So, number of molecules doesn't depend upon temperature.

(d) Kinetic energy per molecule. Their property solely depends upon temperature only. So, two gases at the same temperature must have the same kinetic energy per molecule.

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