5) The kinetic-molecular theory predicts that pressure rises as the temperature

Question

5) The kinetic-molecular theory predicts that pressure rises as the temperature of a gas increases because A) the average kinetic energy of the gas molecules decreases B) the average kinetic energy of the gas molecules is unchanged the gas molecules collide less frequently with the wall EDboth the gas molecules collide more frequently with the wall and the gas molecules collide more gas molecules collide less energetically with the wall energetically with the wall Answer ( 6) Which gas under the specified conditions would come closest to exhibiting ideal gas behavior? He at low pressure and high temperature ) He at high pressure and low temperature E) NH, at high pressure and low temperature B) NHs at low pressure and high temperature D) NH, at low pressure and low temperature Answer ( 7) Arrange the following gases in order of increasing average molecular speed at 25°C. He, O, CO2. N2 Answer ( 8) Which of the following has a 4H%-0 kJ.mol? A) CO:g) ) NO(g) D) NH (aq) E) 12(s) Answer ( 9) Which of the following processes is endothermic? O2(g) + 2H2(g)2H:0(g) E) S(s)+02(g) >SO (g) AH-299 kJ/mol Answer ( 10) For which of these reactions will B) H20(g) H2O(l) D) 11,0(s) H2O(1) in internal energy) be the smallest? B) 4PHs(g) P4(g) + 6H2(g) D) CO2(g) + 2H20(I) CHa(g) A) N2(g) + 3H2(g) 2NH3(g) 202(g) C) H2(g) E) P4(s) Cl2(g) 2HCl(g) 10C12(g) 4PCIs(s) swer (

Explanation / Answer

6) at high temperature,low pressure most of the gases reaches to idel behavior,because at this conditions the attractions between the molecules is minimum.

answer: A

7) average molecular speed is inversily proportional to square root of molarmass.so that by increasing molarmass , speed decreases.

answer: C

8) for elements,at its standard state DH0f= 0

answer: E

9) endothermic means energy is absorbed.

answer: D

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