4.弱电解质: 。
⑴概念: 。
⑵常见物质类别: 。
3.强电解质:
⑴概念: 。
⑵常见物质类别: 。
2.非电解质:
⑴概念: 。
⑵常见物质类别: 。
1.电解质:
⑴概念: 。
⑵常见物质类别: 。
13A、课本58页习题2
14A、导读23页同步训练1
15B、导读23页同步训练3
16B、导读24页同步训练7
17C、导读22页例1
18C、国务院发布的《地震灾区饮用水安全保障应急技术方案》要求灾区分散式饮用水要经过简易沉淀、过滤和消毒处理后,方可饮用。
(1)处理灾区分散式饮用水时:①可用的沉淀方法有 ;②可起到过滤作用的物质有 ;③可有效消毒的方法有 (各举一例)
(2)当你被围困在浑浊的湖水边等待救援时,你如何采取具体的沉淀、过滤和消毒操作,为你和群众提供尽可能卫生的饮用水。
答: 。
3、学会过滤的实验操作技能,并能灵活运用。
2、了解硬水和软水,会熟练地区分和转化;
1、了解自来水的净化过程,知道吸附、沉淀、过滤和蒸馏等净化水的方法;
假定你是李华,准备参加学校举办的主题为“健康成长”的英语作文比赛。请按要求写一篇短文,主要内容包括:
1. 乐观的人生态度;
2. 努力学习;
3. 参加体育锻炼。
注意:1.词数150左右; 2.可以适当增加细节,以使行文连贯; 3.开头已为你写好。
We all want to grow up happily and healthily, and for this goal we must do several things.
73 making preparations for
74 of which the windows
75 of her failure
作文:One possible version:
We all want to grow up happily and healthily, and for this goal we must do several things.
Firstly, we should develop a good attitude to life. Life consists of not only sunshine but also hard times. We should be brave in front of difficulties. Secondly, we must study hard because knowledge is power. If we have the power, we can help to build our country and enjoy life better. In order to study well, we need to do sports so that we can keep fit. We can go running, play ball games or simply take a walk after a day’s study. If we do those things well, we will be able to grow up happily and healthily
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