Activity objectives:
1, understand the basic characteristics of corn kernels, and feel that corn kernels can be turned into popcorn when heated in the microwave oven.
2. Compare the differences before and after the thermal change of the object.
3. Cultivate children's interest in exploring scientific phenomena.
4, interested in scientific activities, can actively explore, find answers, feel the fun of exploration.
Activity preparation:
Corn kernels, microwave ovens, compact discs, courseware, pre-exploded popcorn.
Activity flow:
First, the teacher showed slides to arouse the children's interest.
1, Teacher: We arrived in xu teacher in autumn and invited a small guest from other places. Look! who is it? (Show the corn doll: Do children know what little baby I have? )
2. (Show: Corn on the cob) Let's look for it together, children. (demonstration: rubbing out corn kernels) Understanding: corn kernels Corn dolls: The children are right. My baby is corn kernels. Please make friends with my baby.
Second, observe the corn kernels and guide the children to have a look and talk.
1, each child takes a corn.
2, guide children to observe corn kernels:
Please look at the color of corn kernels. What do they look like?
Let the child pinch it again. How does it feel? Summary: It turns out that corn kernels are small, yellow and hard, like front teeth. (safety education)
Third, carry out popcorn activities.
1, Teacher: Corn kernels are great! It wants to perform a transformation game for children, so how to change it? (The teacher shows the microwave oven), this bag is already full of corn kernels. Can you guess what will happen if you put it in the microwave oven? (children guess)
2. Carry out popcorn activities to guide children to observe and perceive the process of changes in corn kernels: (Safety education: to be completed with the help of parents)
Look, the stove is turning. Where's the bag?
B, smell it, what's the smell?
C.listen, what's the noise in the stove?
D, let's learn how corn kernels dance.
3. Take it out and guide the children to observe the difference between corn kernels and popcorn:
(1), Teacher: Ding, OK. (The teacher pours out the popcorn) The corn we just put in is missing. What has it become now? Conduct safety education: don't touch it if it is too hot.
(2) Let children compare:
Please take a popcorn first. Teacher: Look and say, what color is the popcorn? What is popcorn like? Let the children take a corn and talk about the difference between them: let the children perform a small corn and a big popcorn.
Please smell the popcorn. Do you want to have a taste?
(3) Children's Tasting: How does it taste? Although popcorn is delicious, it belongs to puffed food and should not be eaten more.
Third, the music game: corn kernels turn into popcorn
1, Teacher: Just now, we watched corn kernels play the game of deformation. Now, let's feel the joy of corn kernels turning into popcorn.
2. Game: The teacher gives an instruction: Let's jump in, warm up and start timing.
Teaching reflection:
During the whole lecture, I felt very serious from the beginning. I didn't design this class according to general requirements. I thought it would be good, but I didn't expect it to be a digression. To tell the truth, it's a little sad, but this is the first time, and I don't think the class I designed can reflect my ideas and the teachers can't understand it, but I just think the class I designed is off topic. This is a lesson for me: if you don't give a good lecture, don't pay attention to novelty, which will be self-defeating, not only unable to express your original intention, but also chaotic.
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