综合性学习。

学习了本文《苏州园林》，班内开展了以“话说苏州园林”为主题的综合性学习活动，请你参与。

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    Volunting is to lend a hand and make someone else's day a little easier. There are many organizations in your own company that would welcome your help. Volunteering can also lead to a playing job. Follow these steps to become a volunteer today.

Instructions

1). Write a list of all your skills. You may have a job or a hobby that could help other people. Look at your list and decide on how you can use these skills to help a local organization.

2). Research agencies(服务机构) in your area and find out which needs volunteers. Often non-profit (非盈利的) organizations welcome volunteers for all kinds of tasks.

3). Ask friends if they know anyone who needs a volunteers for all kinds of tasks.

4). Talk to members of your community centre. You may be able to help another member of the organization.

5). Check with your local school. Many schools welcome volunteers. Volunteers help teachers prepare something during the teaching in the classroom.

6). Write a resume (简历) and letter. Resumes show what you have done and what you can do. The letters show your skills and desire (意愿) for being a volunteer. Use resumes and letters to show organizations that you are serious about volunteering.

7). Search the Internet for volunteer opportunities. Visit websites such as volunteer.ca and volunteering. com for information on being a volunteer.

“一般不用K、Ca、Na等活泼金属来置换盐溶液中的其他金属元素”，这是教科书上的一句话。 小科对此进行了思考，并查阅资料，对金属钠和硫酸铜溶液的反应进行探究。

【查阅资料】钠常温下就能与水发生剧烈反应，反应方程式为:2Na+2H₂O==2NaOH +H₂↑。

【提出猜想】猜想一:金属钠和硫酸铜溶液反应会有铜生成。

猜想二:金属钠和硫酸铜溶液反应，生成的沉淀只有氢氧化铜。

【实验及现象】切取不同大小的钠块分别投入到两种不同浓度的硫酸铜溶液中，有关产生沉淀

的现象如下表所示。

小科咨询老师后得知蓝绿色沉淀为碱式铜盐。