Activity goals:
1. Through operational activities, let children initially perceive the phenomenon of dissolution
2. Be willing to participate in scientific activities and be able to use simple language to explain themselves Tell teachers and peers about your findings.
3. Develop children’s thinking and stimulate their thirst for knowledge through playing and talking.
Activity preparation:
1. Each child has a cup and a stirrer.
2. Sugar, salt, milk powder, fruit juice, MSG, soap flakes, fruits (apple slices, orange segments, etc.) soybeans, red beans, mung beans, pebbles, sand, etc.
Activity process:
1. Provide operating materials to stimulate interest
(Provide a cup of boiled water, milk powder, fine salt, apples, and various beans)< /p>
Children, look, what is this?
(Get to know apples, milk powder, fine salt, and various beans)
There is also a glass of boiled water here. What would happen if I put all these things into the water? (Ask children to answer) Is this really the case?
Let’s give it a try, shall we?
2. Give it a try
1) Observe the teacher’s experiment:
The teacher took out a cup of water and some sugar, and asked the children to observe the sugar put into the water. how's it going?
(Invisible, melted)
2) The teacher took out another cup of water and some pebbles, and asked the children to observe what happened when the pebbles were put into the water.
(Can still be seen, but does not dissolve)
Question: Ask the children to think about it, what things you usually see can be dissolved in water?
(Salt, fruit juice, milk powder, etc.)
Teacher summary: Some things can dissolve when put into water and become invisible, while some things can be put into water Cannot be dissolved.
3. Let the children do small experiments (choose one)
1) Introduce the activity materials and let the children know the names of the experimental materials.
Salt, milk powder, fruit juice, MSG, soap flakes, fruit slices, red beans, mung beans, soybeans, pebbles, sand, etc.
2) Let each child give it a try, choose a material and put it into the water, and observe the result.
3) Communicate experimental results: Know that some things cannot be seen when put into water and melt, and some things can be seen even if they are not dissolved.
4. Ask individual children
Ask individual children to tell you what you put in the water? how's it going?
Encourage children to tell their teachers and children about their findings.
Activity extension:
Teachers continue to guide children to observe the phenomenon of substances dissolving in water in daily life, encourage children to do more small experiments, and master more knowledge through experiments
Reflection after class:
During the activity, the children have always been highly motivated, willing to participate in the activity, and share their gains with their peers, but there are also some problems. For example, some children like to mess with other people's experiments, and they don't have a strong sense of group rules.