题目内容

WritingWrite a narrative essay of no less than 200 words on the following topic. Your essay should include one or more direct dialogs. This is an outline that you can follow.Topic:A frustrating experienceIntroduction:Introduce the background of the story and state your thesisBody:Describe what happened to you in detail. Be sure to include one or more direct dialogs in your descriptions.Conclusion:Conclude your essay with a final thought about the experience, or a lesson learned from itMore topics:An unforgettable experienceA difficult decision

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列各数中,有效数字位数为四位的是 ( ) .

A. [H+]=0.0020mol/L
B. CaO %=19.96
C. pH=10.26
D. 5000

已知某溶液pH=0.070,其氢离子浓度为( ) mol·L-1.

A. 0.085
B. 0.8511
C. 0.8
D. 0.851

在20℃,99.3 kPa的气压下,用排水法收集氮气,已知20℃时的饱和水蒸气压为2.33kPa,求此时氮气的压力为( )

A. 99.3 kPa
B. 101.63 kPa
C. 96.97 kPa
D. 94.64 kPa

处于室温的一密闭容器内有水及与水相平衡的水蒸气,现充入不溶于水也不与水反应的气体,则水蒸气的压力( )。

A. 不变
B. 减少
C. 增加
D. 无法确定

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