1、课时作业20模块话题应用文写作科学实验“科学实验”话题包括学生在校进行的实验课、撰写的实验报告；也包括生活中的小实验以及科学家所进行的实验研究。写作一：根据下面的提示，写一篇100词左右的有关“不打破鸡蛋除去蛋壳”的实验报告。实验目的：不打破鸡蛋除去蛋壳。实验仪器和材料：一只玻璃杯，一个小煮锅(saucepan)，水，一个鸡蛋，约250毫升醋(vinegar)。实验步骤：1先把鸡蛋在煮锅中煮10分钟左右；2把鸡蛋放在玻璃杯中；3往玻璃杯中倒醋，醋要漫过鸡蛋；4把鸡蛋在醋中泡24小时。实验结果：24小时后蛋壳完全消失。实验结论：醋中的酸性物质(acid)与蛋壳中的碳酸钙(CaCO3)反应生成二氧
2、化碳(CO2)，蛋壳消失。The aim of this experiment is to remove the shell from an egg without breaking it.To carry out the experiment, you need the following substances: a glass, a small saucepan, water, an egg and about 250 ml vinegar. With all these things ready, you can begin the experiment.First, boil the
3、egg for about ten minutes in the saucepan filled with water. Next, place the egg in the glass and cover it with vinegar. After that, leave the egg in the vinegar for 24 hours.The conclusion is that 24 hours later, you can see that the shell disappears completely. The shell is mostly made of CaCO3 an
4、d the vinegar includes acid. The egg shell dissolves because CaCO3 reacts with acid to form the gas, CO2.写作二：根据下面的提示，写一篇100词左右“观察水的沸腾”的实验报告。The aim of the experiment is to find out the temperature and what happens when water is boiling. When we carry out the experiment, it is important to prepare th
5、e following apparatus: beaker, water, thermometer, alcohol lamp and match. Below is the description of the steps of the experiment.First, fill about 100g water in the beaker. Next, put a thermometer in the water. After that, heat the water in the beaker, and watch the readings of the thermometer.Som
6、e time later, bubbles begin to appear when the temperature reaches 100 . And we can draw a conclusion that water boils when the temperature reaches 100 and a lot of bubbles appear during the boiling.科学实验1实验研究laboratory n. 实验室experiment n. 实验research n. 研究aim n. 目的carry out/conduct/do/perform the exp
7、eriment做实验2实验设备beaker n. 烧杯thermometer n. 温度计alcohol lamp 酒精灯match n. 火柴balance n. 天平apparatus n. 设备；仪器crucible n. 坩埚test tube 试管equip vt. 装备，配备equipment n. 设备3实验过程watch v. 观察measure v. 测量；估量leave vt. 使处于某种状态cover vt. 覆盖acquire/gain/obtain vt. 获得place vt. 放置swirl v. 旋转filter vt. 过滤explain vt. 解释expl
8、anation n. 解释summarize v. 概括；总结summary n. 摘要observe v. 观察observation n. 观察instruct vt. 指导instruction n. 指导analyze vt. 分析analysis n. 分析find out 发现add.to.往加入4实验结果dissolve vi. 溶解；分解；分离form vi. 形成liquid n. 液体substance n. 物质solid n. 固体gas n. 气体appear vi. 出现boil vi. 沸腾boiling n. 沸腾conclude vt. 做结论conclusion n. 结论react vi. 反应reaction n. 反应physical/chemical change物理/化学变化
