问题 选择题

在0.1mol/L的CH3COOH溶液中存在如下电离平衡:CH3COOH⇌CH3COO-+H+对于该平衡,下列叙述正确的是(  )

A.加入少量NaOH固体,平衡向正反应方向移动

B.加水,反应速率增大,平衡向逆反应力向移动

C.滴加少量0.1mol/L HCl溶液,溶液中c(H+)减少

D.加入少量CH3COONa固体,平衡向正反应方向移动

答案

A、加入氢氧化钠溶解后的氢氧根离子和氢离子反应促进电离平衡正向进行;故A正确;

B、电离是吸热过程,加热反应速率增大,醋酸电离平衡正向进行;故B错误;

C、加入盐酸氢离子浓度增大,平衡左移;达到锌平衡后,溶液中氢离子浓度增大,故C错误;

D、加入醋酸钠溶解后的醋酸根离子抑制醋酸电离,平衡左移;故D错误;

故选A.

阅读理解

According to Beth Anaclerio, an Evaston mother of two, ages 4 and 18 months, a child’s birthday party doesn’t have to be a hassle; it can be a basket of fun, “Having a party at home usually requires a lot of running around on the part of the parents, and often the birthday boy or girl gets lost in wild excitement.But it really doesn’t have to be that way,” said Anaclerio.Last summer, Anaclerio and her friend Jill Carlisle, a Northbrook mother of a 2-year-old, founded a home party-planning business called “A Party in a Basket.” Their goal is to help parents and children share in the fun part of party planning, like choosing the subject or making a cake, while they take care of everything.

Drawing on their experiences as mothers, they have created 10 ready-to-use, home party packages.Everything a family needs to plan a party, except the cake and ice cream, is delivered to the home in a large basket.

“Our parties are aimed for children 2 to 10,” Anaclerio said, “and they’re very interactive(互动) and creative in that they build a sense of drama based on a subject.For example, at the Soda Shoppe party the guests become waiters and waitresses and build wonderful ice cream creations.”

The standard $200 package for eight children includes a basket filled with invitations, gifts, games and prizes, paper goods, a party planner and the like.For more information, call Anaclerio at 708-864-6584 or Carlisle at 708-205-9141.

小题1:The main purpose of writing this text is _____.

A.to share information about party planning

B.to introduce the joys of a birthday party

C.to sell a service

D.to announce a business plan小题2:The most important idea behind the kind of party planning described here is that _____.

A.it brings parents and children closer together

B.guests play a part in the preparation of a party

C.parents are spared the trouble of sending invitations

D.it provides a subject of conversation小题3:What does the underlined word “hassle” probably mean?

A.a party designed by specialists.

B.a plan requiring careful thought.

C.a demand made by guests.

D.a situation causing difficulty or trouble.小题4:Which of the following is most likely to be a party planner?

A.

B.

C.

D.

多项选择题