问题 单项选择题

容器中贮有1mol的理想气体,温度t=27℃,则分子平均平动动能的总和为()。

A.3430.0J

B.3739.8J

C.2492.0J

D.6322.5J

答案

参考答案:B

解析:

一个气体分子的平均平动动能为,1mol理想气体的分子数为NA(阿伏伽德罗常数),即NA=6.022×10-23mol-1,所以,1mol气体分子平均平动动能的总和为,即6.022×10-23mol-1×1.38×10-23J·K-1×300K=3739.8J,故选(B)。

完形填空

第II卷

第一节对话填空(共10小题;每小题1分,满分10分)

请认真阅读下面对话,掌握其大意,并根据所给首字母的提示,在标有题号的右边横线上写出一个英语单词的完整、正确形式,使对话通顺。

M="Mike;" J=Jenny

M: Morning, Jenny. Did you(76) e________your weekend?                                          76. ________        

J: Yes. We went to the countryside and had a great (77) t________.                        77.   ________      

M: Where did you stay? In a hotel?

J: No. We camped in the mountains, near Snowdon.

We cooked all our meals over an (78)o _______fire.                                            78. ________        

M: That(79)s________wonderful.                                                                             79. ________        

How was the(80)w________there?                                                                         80. ________        

J: The sun (81) s________brightly. It was really lovely there.                                       81. ________        

M: Did you like the people there?

J: Yes, they were great. We(82) m________some farmers and had tea in their homes.      82. ________        

M: When did you get (83)b________?Last night?                                                        83.   ________      

J: No. This morning. You’ll think we were mad. We got up at 4:30, left at 5:00

and (84)a ________here at 9:00.I’m so tired. What about you? Did you have a good weekend? 84. ________      

M: Yes, but I didn’t do much. I just stayed at home and (85)w________TV.                      85. ________ 

单项选择题