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一、制备K
s*5u二、提纯
方案1
方案2
主要试剂和产品的物理常数
| 名 称 | 相对分子质量 | 熔点或沸点（0C） | 水 | 醇 | 醚 |
| 水杨酸 | 138 | 158(熔点) | 微溶 | 易溶 | 易溶 |
| 醋酸酐 | 102 | 139.4(沸点) | 反应 | 可溶 | 易溶 |
| 乙酰水杨酸 | 180 | 135(熔点) | 微溶 | 可溶 | 微溶 |
（1）①合成阿斯匹林时，还会生成一些副产品，其中有一种是高分子，为了分离此物质，方案1中加入A物质为 ▲ 溶液。
②本方案抽滤后进行洗涤，其具体操作是 ▲ 。
（2）方案2为改进的提纯方法，称为重结晶提纯法。
①该方案中步骤1除了选用乙酸乙酯外，还可选择下列哪些
试剂 ▲ 。
A. 乙醇 B. 蒸馏水 C. 乙醚
②步骤2回流的装置如图所示，写出仪器a的名称 ▲ ，使用温度计的目的是 ▲ ，冷凝水的流向为 ▲ 。
③方案2所得产品的有机杂质要比方案1少的原因是 ▲ 。
（3）该学习小组在实验中原料用量：2.0g水杨酸、5.0ml醋酸酐（ρ＝1.08g·cm-3），
最终称量产品m="2.2g" ，则乙酰水杨酸的产率为 ▲ 。 查看习题详情和答案>>
完形填空（二）（本题共15小题，满分30分）
阅读下面短文，根据文意，将方框内所给的词或短语的适当形式填入相应的空白处，使短文的意思完整。（每个词只能使用一次）（本题共十小题，每小题2分，满分20分）
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last, save, neighbourhood , energy, again, so that ,possible, whether, everyday, do harm to |
We all need a healthy environment, but we produce waste every day and it___1__ our environment. Though we are young, we can still do something to help. In fact, even the simplest __2__activities can make a real difference to the environment. Here are some ideas for you.
Reduce means “use less”. Don’t waste things. This ___3__money and reduces pollution and waste going into the environment. Before we buy something new, think __4___it is really necessary—or maybe the old one will be just as good! When we do buy things, choose local products if __5____ and try not to buy too many things from abroad.
Reuse means “use again”. Use things for as long as possible. When we buy things, make sure that they __6__ a long time. We should look after them__7__ they will last and we should repair them if we can instead of throwing them away and buying new ones. Don’t use a paper cup or a paper bag. It’s better to use a china cup and a lunch box because you can use them __8_.
Recycle means “change things into something else”. Although it takes __9__ to change something into something else, it’s better than throwing things away or burning them. Find out what can be recycled in your_10___ and take part in recycling programmes. We should also buy products made from recycled materials, such as recycled paper, to help save trees.
查看习题详情和答案>>
完形填空（二）（本题共15小题，满分30分）
阅读下面短文，根据文意，将方框内所给的词或短语的适当形式填入相应的空白处，使短文的意思完整。（每个词只能使用一次）（本题共十小题，每小题2分，满分20分）
We all need a healthy environment, but we produce waste every day and it__【小题1】__ our environment. Though we are young, we can still do something to help. In fact, even the simplest _【小题2】__activities can make a real difference to the environment. Here are some ideas for you.
Reduce means “use less”. Don’t waste things. This __【小题3】__money and reduces pollution and waste going into the environment. Before we buy something new, think ___【小题4】____it is really necessary—or maybe the old one will be just as good! When we do buy things, choose local products if __【小题5】_____ and try not to buy too many things from abroad.
Reuse means “use again”. Use things for as long as possible. When we buy things, make sure that they __【小题6】__ a long time. We should look after them__【小题7】_ they will last and we should repair them if we can instead of throwing them away and buying new ones. Don’t use a paper cup or a paper bag. It’s better to use a china cup and a lunch box because you can use them __【小题8】__.
Recycle means “change things into something else”. Although it takes ___【小题9】_ to change something into something else, it’s better than throwing things away or burning them. Find out what can be recycled in your_【小题10】__ and take part in recycling programmes. We should also buy products made from recycled materials, such as recycled paper, to help save trees.