英语必修 第三册Unit 3 The world of science学案设计

这是一份英语必修 第三册Unit 3 The world of science学案设计，共4页。

实验报告属于说明文，主要用来说明实验的目的、过程以及实验的结果。全文可以分为三个部分，首先说明实验的目的和实验所需要的实验器材；然后说明实验所采用的方法，实验具体过程以及实验所得到的结果；最后根据实验的情况得出相应的结论。句式要多用祈使句，时态多为一般现在时。
[基本框架]
1．开头(beginning)——交代实验的目的和所需器材
2．主体(bdy)——介绍实验方法、过程及结果
3．结尾(ending)——写出实验结论
[常用词块]
1．make gd preparatins fr the experiment
为实验做好充分准备
2．d the experiment as fllws按照如下做实验
3．find a better way f ding it
找到一个更好的方式来做它
4．be under bservatin正在观察中
5．make a gd study做好充分研究
[常用语句]
★精彩开头
1．We carry ut the experiment t find ut why it rusts.
我们做实验是为了查明它为什么会生锈。
2．The aim f the experiment is t find the cause f giving away the gas.
实验的目的是找到气体泄露的原因。
3．With the purpse f discvering hw it reacts with acid，we carry ut the experiment.
为了发现它是怎么和酸发生反应的，我们进行了这次实验。
★正文佳句
1．Befre we started，we prepared a candle，a glass，a basin and sme water.
开始之前，我们准备了一支蜡烛，一个玻璃杯，一个盆子还有一些水。
2．The glass must be a little higher than the candle s that we can see the result mre easily.
玻璃杯必须比蜡烛稍高一点儿，以便于我们能够更容易看清结果。
3．We were astnished t see that the water level in the glass was higher than that in the basin.
我们很吃惊地发现玻璃杯里的水位高于盆子中的水位。
★余味结尾
1．We had an interesting experiment lessn.
我们上了一堂非常有意义的实验课。
2．We were greatly impressed with the prcess f burning.
我们对燃烧的过程印象非常深刻。
3．The experiment intrduced us t a useful way f explring the unknwn field.
这次实验为我们介绍了一种探索未知领域的有用的方式。
请根据以下内容写一篇实验报告。
实验目的：测量镁在空气中加热后重量是否有变化
实验用品：镁(magnesium)，本生灯(Bunsen burner)，天平(balance)，坩埚(crucible)
实验步骤：1.把镁放进坩埚内；2.把坩埚放在天平上称重；3.点燃本生灯，加热坩埚；再把坩埚放在天平上称重；5.比较两次称重的结果。
试验结果：第二次称重数据大于第一次称重的数据
实验结论：镁在空气中加热后重量有变化
【学生习作】
【升格作文】
The aim f the experiment is t find ut if there's a change in weight after magnesium is heated in air.
T carry ut the experiment, yu need the fllwing things: magnesium, a Bunsen burner, a balance and a crucible. When all these are ready, yu can begin the experiment.
First, put the magnesium in the crucible. Then put the crucible n the balance and weigh them. Next, light the Bunsen burner and place the crucible ver it t heat the magnesium. Finally, weigh them again, and cmpare the tw weights.
Yu can see the magnesium weighs a little heavier than befre. That's because there is a change in weight after magnesium is heated in air.
请根据下列内容，写一篇短文，说明整个实验的内容。
实验目的：不打烂鸡蛋取走蛋壳。
实验器材：一个玻璃杯，一个小锅，水，一个鸡蛋，醋(vinegar)约250毫升
实验步骤：
1．把鸡蛋放在锅中煮十五分钟左右；
2．把煮熟的鸡蛋放到玻璃杯中；
3．往玻璃杯中倒醋，醋要漫过鸡蛋；
4．让鸡蛋在醋中浸泡24小时。
实验结果：24小时后，鸡蛋壳完全消失。
实验结论：醋中的酸性物质(acid)与蛋壳中的碳酸钙(calcium carbnate)反应生成二氧化碳(carbn dixide)蛋壳(shell)消失。







【参考范文】
The aim f the experiment is t mve the shell frm an egg withut breaking the egg.T carry ut the experiment, yu need the fllwing things: a glass，a small pt/biler, sme water, an egg and abut 250 ml vinegar.When all these things are ready, yu can begin the experiment.
First, bil the egg fr abut 15 minutes in a pt filled with water.Next, place the egg in the glass and cver it with vinegar.After that，leave the egg in vinegar fr 24 hurs.
24 hurs later, yu can see the shell disappear cmpletely.The egg shell disappears because it is made up f calcium carbnate while the vinegar is an acid.The tw substances react t frm the gas, carbn dixide.Aim：find ut if there's a change in weight after magnesium is heated in air.
Things t use：magnesium, a Bunsen burner, a balance and a crucible.
Prcess：First，put the magnesium in the crucible. And weigh them.Next，light the Bunsen burner and place the crucible ver it t heat the magnesium.Finally, weigh them again, and cmpare the tw weights.
Result：a little heavier than befre.
Cnclusin：There is a change in weight after magnesium is heated in air.
[点评]
1.要点不够齐全，不符合实验报告的严谨性原则。
2.实验目的、实验用品和实验步骤单列条目，未能形成报告的形式。