1. If the temperature of a fixed amount of an idal 7.You wish to increase the te
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1. If the temperature of a fixed amount of an idal 7.You wish to increase the temperature of a 1.00- gas is increased, it NECESSARILY follows that A) the pressure of the gas will increase B) the volume of the gas will increase. Q) All of the above statements are correct D) the speed of the gas molecules will increase kg block of a certain solid substance from 20 C to 25°C. (The block remains solid as its temperature increases.) To calculate the amount of heat required to do this, you need to know A the specific heat of the substance B. the molar heat capacity of the substance C the heat of fusion of the substance D. the thermal conductivity of the substance E more than one of the above. 2· The average molecular kinetic energy of a gas can be determined by knowing A) only the number of molecules in the gas B) only the volume of the gas. C) only the pressure of the gas D) All of the above quantities must be known to determine the average molecular kinetic energy E) only the temperature of the gas 8. Is it possible to transfer beat from a cold reservoir to a hot reservoir? 4) No; this is forbidden by the second law of 3. During an isothermal process, 5.0 J of heat is B) Yes; this will happen naturally C) Theoretically yes, but it hasn't been removed from an ideal gas. What is the change in internal (thermal) energy of the gas? 4) 2.5J B) 5.0J C) 7.5J D) 10J E) 0.00J D) Yes, but work will have to be done A container is filled with a mixture of helium (light molecules) and oxygen (heavy molecules) gases. A thermometer in the container reads 22°C. Which gas molecules have the greater average kinetic energy? 9. When a fixed amount of ideal gas goes through an isothermal expansion, 4. A) the gas does no work B) no heat enters or leaves the gas. A) The oxygen molecules do becanuse they are diatomic B) It is the same for both of the gases because the temperatures are the same. C) The oxygen molecules do because they are more massive D) The helium molecules do because they are less massive E) The helium molecules do because they are C) its internal energy does not change. D) its temperature must decrease E) its pressure must increase As a result of any natural process, the total entropy of any system plus that of its 5. A) sometimes decreases. B) never decreases C) never increases. same 10. Rank the following heat engines in order from highest to lowest thermal efficiency B. An engine that in one cycle absorbs 50,000 J of heat and does 4000 J of work A. An engine that in one cycle absorbs 2500 J of heat and rejects 2250 J of heat C. An engine that in one cycle does 800 J of work and rejects 5600 J of heat shown in the ph figure is an A) adiabatic expansion B) isobaric expansion D) isochoric expansion. E) isochoric compressionExplanation / Answer
1) from ideal gas equation PV = nRT
If temperature is increased then pressure may also increase and volume may also increase
So in general we can say above two statements are correct.
2) average Kinetic energy depends upon temperature
3) for isothermal process change in temperature will be zero so no change in internal energy.
4) in case of isothermal process internal energy doesn't change.
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