Unit 5 Look into Science.Lesson 26 Keep the Candle Burning. 教案

Unit 5 Look into Science
Lesson 26 Keep the Candle Burning
1. Analysis of the Students
The students of Grade 9 have mastered certain vocabularies，expressions and structures. They also have the abilities of self-teaching and working in groups. Most of them are willing to express their opinions in English.www.21-cn-jy.com
2. Analysis of Teaching Content
Lesson 26 is the second lesson in Unit 5, Book 5.This unit focus on the subject Look into science, also teach the students something about science. Students cares about the subject because it is close to everyone. Lesson 26 mainly talks about learn to do another experiment.
【知识目标】
To master the words: match, light, burn, use up, candle holder, shallow, oxygen, one-fifth.
2. To master the expressions: do an experiment, fill…with, cover…with, turn…upside down, be (not) sure…2·1·c·n·j·y
【能力目标】
Improve the students’ ability of speaking, listening, reading and writing. Do and express the experiment.【来源：21·世纪·教育·网】
【情感目标】
Students can enjoy the pleasure of literature.
【教学重点】
The usage of prefer.
【教学难点】
Write a composition to describe an interesting experiment.www-2-1-cnjy-com

Tape recorder, Multimedia
Step 1. Warm-up
Free talk:
Think about it!
1. Do you think science is interesting? Why or why not?21·世纪*教育网
2. Name one or two famous Chinese scientists. What do you know about them?
Step 2. Presentation
Do an experiment.
Show the picture and tell students the experiment: Keep the Candle Burning.
Introduce something we need in the experiment, meanwhile learn the new words.
Guess: What do we do the experiment?
Read the text and fill in the blanks on page 69.
Let’s do the experiment together! Put the candle in the candle holder. Put the candle holder on the dish. Fill the dish half full with water. Light the candle with a_______ or a lighter. What can you see? The candle is burning. ________the candle burn for two or three minutes. Then carefully put the jar over it until the top of the jar rests on the dish. As the candle burns, it_______ the oxygen in the air. When the candle stops________, it has used up all the oxygen in the air. The water inside the jar_______ and fills about________ of the jar. This is because about one fifth of the air is made up of oxygen. 21教育网
Check the answers.
Guess: What is happening? Listen to the tape and answer the question.21cnjy.com
Listen and follow to the tape.
Explain the expression of fractions:
(1) 分数由分子和分母两部分构成。用英语表达时，分子用基数词，分母用序数词。
(2) 如果分子为1，则分母的序数词是单数形式，如果分子大于1，则分母的序数词用复数形式。
? ＝ one (a) half 或 one second (one-second)
? = one (a)quarter 或 one-quarter
Step 3. Practice
Practice the text in groups.
Finish the exercise on page 69.
Retell the experiment.
Step 4. Consolidation
Group work: (Teacher asks students prepare something they need in experiments in groups.)
Do the experiment in groups.
Read about the experiment in this lesson. With a group of classmates, practice the experiment. Do your experiment in front of the class. Don’t forget the following things:
(1) First, describe your experiment.
(2) Second, ask the class what they think will happen.21世纪教育网版权所有
(3) Third, do the experiment.
(4) Finally, ask the class if the result is what they expected.21·cn·jy·com
Show the experiments.
Get a result.
Write down the progress in the experiment.
Step5 Homework
1. Listen and read.
2. Finish exercises of this lesson.
略。