Writing教案3

A lesson in a lab (Book One)

Writing Zhang huai bin from Tianjiabing Middle School Of Luzhou

Teaching goals

1. Target language

Words and expressions of sequence Everyday English 2. Ability goals

Enable the students to pay attention to the intonation in questions. Enable the students to write a description of an experiment, and pay attention to the function words. 3. Learning ability goals

Help the students learn how to write a description of an experiment according to the outline. Teaching important and difficult points

Help the students organize the ideas about an experiment.

Teaching methods

Question-answer method and pair work. Teaching aids

A computer, a projector and a recorder. Teaching procedures & ways

StepⅠ Revision Check the students’ homework. Step Ⅱ

Exercise 5 (P92) This exercise asks the students to use the given words to describe the picture. Give them 2 or 3 minutes to prepare the task, and then ask some of them to read out their descriptions. Step Ⅲ

Function The purpose of this part is to let the students master the words and expressions of sequence. Ask the students to look at the words in italics and then answer the question: When do we use them? Step Ⅳ Speaking and Writing (P96) The purpose of this part is very clear. That is to ask the students to practice the way of describing an experiment, and also make use of the function words. match the headings with the paragraphs quickly. Please pay attention to the function words. Check the answers with the class. Then look at Exercise 17. We are going to write a description of the experiment in Activity 13. You can refer to the plan and pictures on page 95 to organize your ideas. A sample description: Aim: The aim of this experiment is to write a secret message with invisible ink.

Equipment: a lemon, a small container, a pen, some white writing paper, a candle and some matches. Method:

First, squeeze the lemon and pour the juice into a container.

Next, take your pen and dip it into the lemon juice. Then write your message on a clean sheet of white paper.

After that, blow the paper to dry the lemon juice.

Next, light a candle with the matches.

Finally, hold the paper near the candle flame. Result: The message will gradually appear on the paper with light brown color words. Conclusion: The message appears when you heat it because the lemon juice reacts with oxygen in the air. This reaction produces a brown colored oxide which you can see. Step Ⅴ

Homework TASK on page 50. A sample report: A Simple Scientific Experiment Below is a description of a simple scientific experiment. It shows us the hydrolysis of salt. Aim: To find out the acidity(酸性) and alkalescence(碱性) of the solution (溶液) with the same thickness.

Apparatus: Ph test paper, glass rod, glass sheet, test tube, Na2CO3, NH4Cl, NaCl with the same thickness. Method: 1) Add Na2CO3, NH4Cl and NaCl to three different test tubes to form three different solutions with the same thickness. 2) Put a piece of Ph test paper on the glass sheet. 3) Put glass rob in the tube with Na2CO3 in it, and get some solution to the paper. 4) Find out PH in the color comparator. 5) Repeat the stages from 2-4 with NH4Cl and NaCl. Conclusion: The salt from strong acid and weak base is neutral. The salt from strong and weak base is acidity. The salt from weak acid and alkali is alkalescence.