盐酸与铝粉反应时，下列措施能使最初的反应速率明显加快的是（ _爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题多选题

盐酸与铝粉反应时，下列措施能使最初的反应速率明显加快的是（　　）

A．加入少量NaCl固体

B．盐酸的用量增加一倍

C．盐酸的用量减半，浓度加倍

D．向反应混合物中加入少许铜粉

答案

A、加入少量NaCl固体，不影响盐酸的浓度，反应速率几乎不变，故A错误；

B、盐酸的用量增加一倍，不会改变盐酸的浓度，反应速率不变，故B错误；

C、盐酸的浓度增大，可以加快反应速率，故C正确；

D、加入金属同，可以和金属铝反应置换出金属铜，形成Cu、Al、盐酸原电池，加快了反应速率，故D正确．

故选CD．

阅读理解

Are you hard-working ? Do you like to meet people ? If your answer is “yes” , then we have a job for
you as a waiter.
Call Blue Hotel at 78868656 !

Wanted
Do you like to talk with people ? Do you like to write stories ? If you want to work for our magazine as a reporter, please call Murray at 2655866

Helped wanted
Do you like babbies ? Can you look after one babby for two days ? If you are sure to look after it well, please call us at 78859879
＄80 or more
Today Hurry!

Can you make a large huose clean and tidy ?If you hope to get the job and be paid ＄50 once ,call us at 7884523
18:00---20:00 this evening

请根据以上信息，选择正确答案，将其标号在答题卡上涂黑。（每小题2分，共10分）
小题1: The above ads are probaly from a _________．

C．science book

小题2: If you like children and have two free days , you can call ______ for a job.

小题3: If Tom cleans the house for the ower twice a week , he can get ______ for a month’s work.

小题4:_________ are needed in Blue Hotel .

小题5: If you want to work as a reporter ,you will probably be interested in ________ .

单项选择题

血液不逸出脉外有赖于气的作用是指

A．气化

B．温煦

C．推动

D．固摄

E．防御