问题 选择题

下列关于电解质的叙述中,正确的是

A.碳酸钙在水中溶解度很小,其溶液的导电性很弱,所以碳酸钙是弱电解质

B.氢氧化钙微溶于水,但溶解的氢氧化钙全部电离,所以氢氧化钙是强电解质

C.氯气和氨气的水溶液导电性都很好,所以它们是强电解质

D.水难电离,纯水几乎不导电,所以水是非电解质

答案

答案:B

题目分析:A:强弱电解质和溶解度没有直接关系,A错;C:氯气和氨气的水溶液导电是因为生成氨水和亚硫酸,NH3H2ONH4++OH-,H2SO3H++HSO3-,并不是氯气和氨气本身导电,它们不是电解质,C错;D:是因为水属于极弱的电解质,电离程度是10-7,氢离子和氢氧根离子很少,所以几乎不导电。带有溶质的水是因为有电解质所以导电能力很强的,但水也是电解质,故选B。

点评:强弱电解质与溶解度无直接关系,这是一个易错点,应注意

阅读理解

Come for Dinner by Leslie Revsin

Make every meal a feast and every moment with loved ones an occasion with Come for Dinner. Revsin, the former owner and chef of Manhattan’s Restaurant Leslie, offers a collection of over 150 recipes designed for small get-togethers of friends and family. There are various ethnic dishes that draw from Asia,the Mediterranean, Latin cultures and more. Revsin believes cooking at home provides the opportunity to connect with friends and family on a good level.

Retro Beach Bash by Linda Everett

Grab your beach blanket and your surfboard — it’s time for a beach party! With more than 100 recipes (菜谱) for beach picnics and barbecues, Retro Beach Bash, is the beach lover’s companion for fun in the sun.

Half information and half cookbook, you can browse the pages that are filled with beach fun tips and advice. The second half of this book is a cookbook, complete with delicious picnic and grilled foods to satisfy every taste on the beach.

Entertaining Edibles by Sidney Escowitz

You’ve seen them decorating plates at restaurants, admired them at weddings, and expressed great surprise at the chefs who designed them — and now you can produce them at home.

Sidney shares lots of practical tips that will give your finished food sculptures a professional look and send you on your way towards creating your own original works of food art.

Recipes from a Tapas Bar by Olivier Said

If you’re a fan of Spanish Tapas bars, this book is a must-have for your library. Even if you don’t cook, you’ll still want this book if you’re a fan of Tapas bars, only for the lively discussions of the cheeses of Spain along with other Spanish wines and spirits.

小题1:If you want to prepare a delicious dish for your family at home, you’d better choose _____.

A. Entertaining Edibles                              B. Retro Beach Bash

C Recipes from a Tapas Bar                        D. Come for Dinner

小题2: Retro Beach Bash tells us _____.

A.how to make picnics on the beach

B.how to repair your surfboard

C.how to make Spanish wines

D.how to satisfy your taste at home小题3:Who can tell you how to make the works of food art?

A.Leslie Revsin.

B.Linda Everett.

C.Sidney Escowitz.

D.Olivier Said.小题4:The books mentioned in the text are mainly about _____.

A.people

B.traveling

C.cooking

D.sports

判断题