(I) Multiple-Choice Questions 1) Which statement is false? A) Gases are mostly e
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(I) Multiple-Choice Questions 1) Which statement is false? A) Gases are mostly empty space B) The molecules of an ideal gas exert neither attractive nor repulsive forces on one C) All molecules of an ideal gas have the same kinetic energy at constant temperat D) Molecules of a gas undergo many collisions with each other and the container walls. E) Molecules of greater mass have a lower average speed than those of less mass at the same temperature. another Answer ( 2) If equal masses of O:(g) and HBr(g) are in separate containers of equal volume and temperature, which one of these statements is true? A) The pressure in the 02 container is greater than that in the HBr container. B) There are more HBr molecules than O2 molecules. C) The average velocity of the O2 molecules is less than that of the HBr molecules. D) The average kinetic energy of HBr molecules is greater than that of O2 molecules. E) The pressures of both gases are the same. Answer ( 3) 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 C) the gas molecules collide less frequently with the wall D) the gas molecules collide less energetically with the wall E) both the gas molecules collide more frequently with the wall and the gas molecules collide more energetically with the wall Answer 4) Which of the following statements conflicts with the kinetic molecular theory of gases? A) There are no forces between gas particles. B) Gas particles occupy a negligible volume compared with the volume of their co C) The average kinetic energy of the gas particles is proportional to the absolute temperature. D) Gas particles lose energy when they collide with each other. E) Gas particles are in constant, random motion. Answer ( 5) Which gas under the specified conditions would come closest to exhibiting ideal gas behavior? A) He at low pressure and high temperature C) He at high pressure and low temperature E) NHs at high pressure and low temperature B) NHs at low pressure and high temperature D) NHs at low pressure and low temperature Answer ( 6) Which is the smallest quantity of pressure? B) 1 centimeter of Hg C)I mm Hg D) I pascal E) 1 torr Answer (Explanation / Answer
Q1
a)true, since they are disperse, they occupy very low sapce of the container
b) true, sicne ideal, will not interact with one another
c) false, they are still "randomly" moving
d) true, for any gas
e) true, accoridng to E = 1/2*m*v^2
Q2
a) MW of O2 = 32, MW o fBr = 80, then, is equal masses, therea re more moles of O2, According to dalton, partial pressure of O2 is greated
b) false, since it is heavier, less moles present
c) False, according to E = 1/2*mV^2 , the velocity increases for O2 in general, since less mass
d) false, average energy is the same, since same T
e) false, according to dalton, they distribute accoridng to mole fraciton
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