Lesson in a Lab教案
write about your experiment using these headings:
aim equipment method result conclusion
steps students’ acting teacher’s organizing
1 let the students know what to do. read the intructions to make sure what they should do
2 read text b again. have the students read text b
3 write about the experiment using the headings. ask the students to write about the experiment using the headings.
4 read out their experiment notes two or three pairs. get some students to read out their experiment notes.
detailed explanations to the exercises:
grammar:
1.1c 2f 3e 4b 5a 6g 7d
2.1 eleven times larger
2 five times further
3 twenty times bigger
4 half as big as
5 as big as
sample answers:
saturn is ten times larger than earth.
saturn is about twice as far from the sun as jupiter.
jupiter is eleven times bigger than earth.
earth is twice as big as mars.
jupiter has nearly as many moons as saturn.
3.1 healthier, longer 2 more, less
3 warmer and warmer 4 bigger and bigger 5 more, more
4.1 a bit 2 a lot 3 rather 4 a little
vocabulary
5. students’own answers.
6.1 gas: steam oxygen air
2 solid: glass iron metal salt steel
3 liquid: oil water
7.boil water bunsen burner cotton wool nobel prize scientific experiment test tube
8.1 method 2 aim 3 apparatus 4 gravity 5 electricity 6 conclusion, results
7 balance 8 heat 9 expands 10 boil
9.1b 2b 3c 4b
10.summary 3 從倒數第三、四段可知是一個叫paul的學生誤拿了丙烯酰胺試劑,燒出嗆人的味道。
11.1 baking soda and hydrochloric acid.
2 salt.
3 by making the mixture hotter.
4 he used the wrong liquid.
5 because there was no label on the bottle.從倒數第四段右欄一、二兩行可看出。
6 it formed a thick cloud of white gas. 由倒數第三段最后一句可知。
7 because the liquid was acrylamide and the gas was poisonous.從倒數第二段最后一句可知。
8 never to leave a bottle without a label in the chemistry lab. 從倒數第四段可知。
12 students’ own answers.
13&14
the aim is to write a secret message.
1b squeeze a lemon and put the juice into a container
2f dip your pen into the juice
3a write your message on a piece of paper
4g blow on the paper to dry the lemon juice
5e light a candle
6c heat the paper in the candle flame
7d the message appears when the juice reacts with oxygen and produces brown oxide