Analysis: To make the egg float, the upward force must be greater than the downward gravity, f (floating) = ρ (aqueous solution) gV, and G=ρ (egg) gV. The density of hot water is less than that of cold water, so the eggs can only sink to the bottom as soon as possible. Of course, if the water is always on, the water will convect, and bubbles may attach to the eggs, or the eggs may be in the water.
After cooking, the quality of eggs will remain unchanged and the volume ratio will change, so the fundamental problem cannot be solved. 1. Try to change the density of the aqueous solution, such as adding salt and sugar ... 1. Add an upward force to the egg and lift it with a thread to make it float.
(this seems to be some hooligans.
) 13. increase the drainage volume of eggs and drop wax on them. The density of wax is less than that of water. If you drop wax on an egg, gravity will not increase as quickly as buoyancy ... so that the egg can float later.
4. Comprehensive consideration, add vinegar.
When acetic acid is added to water, the density of water will increase. In addition, vinegar reacts with eggshells, and the quality of eggs will decrease. In addition, the generated carbon dioxide gas will adhere to the surface of the egg and hold it up. When it reaches the surface, carbon dioxide will be mixed with air and the egg will sink into the water. Then the eggshell reacts with vinegar, and there will be carbon dioxide ... so repeatedly, the egg will float up and down in the water.
Or try to cook eggs and put them in water, and they may float.
In addition to salt, you can also put soluble substances into the water to make it denser, so that eggs can float. Add honey or mercury to water, add bromine to water, add milk to water, and add something to make the density of liquid greater than that of eggs.
Better use hydrochloric acid! ! .
2. Tips for Children's Life 100 Tips for Life
1. Brushing your teeth in the morning and evening is one of the effective ways to protect your teeth.
2. Correct reading and writing posture is beneficial to protecting eyesight.
Because raw water contains bacteria and eggs, you can't drink it.
You can't go swimming in the swimming pool when pinkeye is popular.
5. The function of lung is to inhale oxygen continuously and exhale carbon dioxide.
6. Preventing myopia is mainly to achieve "three wants and three don't".
7. Hepatitis A is a highly contagious infectious disease.
8. Vaccination with BCG vaccine on time is a safe and effective method to prevent tuberculosis.
9. Sugar is good for protecting the liver.
10, not only do a good job in family hygiene, but also do a good job in environmental hygiene.
1 1, physical exercise is beneficial to our growth and physical fitness.
12, boys before puberty want * * * tight pants, girls don't want to gird their bellies and waists, and * * * high heels.
13, children can't smoke; Because smoking is very harmful to health.
14. The simplest and most economical way to prevent iodine deficiency disorders is to insist on eating iodized salt for a long time.
15, the main function of teeth is to chew food.
16, real health means that a person's physiology, psychology and ability to adapt to society and environment are in good condition.
17, the main function of fat is to supply human body with heat; Maintain body temperature; Promote the absorption of fat-soluble vitamins; Protecting internal organs and moisturizing the skin are very important to the human body.
18, maintain public health, do a good job in residential areas, streets and public places, and take good care of public health facilities.
19, to prevent anemia, we should correct bad eating habits such as partial eclipse and picky eaters.
20. First aid facilities include emergency telephone numbers (120); Ambulances and hospital emergency rooms, etc.
Our body consists of head, neck, trunk and limbs. Sugar is good for protecting the liver.
Vaccination can prevent diseases and keep healthy.
23, the correct way to brush your teeth is to brush the toothbrush, the upper teeth are brushed from top to bottom, the lower teeth are brushed from bottom to top, and the mandibular surface is brushed back and forth, from top to bottom.
24. The function of the stomach is to digest food, absorb nutrients and discharge dregs.
25, autumn is coming, the temperature is getting lower and lower, send you a text message to care: it is still hot after the summer heat, so pay attention to your health; Wear more clothes and less * * * to prevent diseases caused by cool autumn; Exercise regularly, do more exercise, be healthy, and bind your body!
26. In early autumn, the weather turned cold, and we began to make up for the enjoyment of happiness, choose less and be more sour, and adjust our diet and nutrition. Try to eat less onions, garlic, ginger, leeks and peppers, eat less fried puffed wine and eat less sour fruits and vegetables to stay healthy!
27. Drinking soup before meals varies from person to person, and it is also necessary to master the time of drinking soup. Generally, it is advisable to have half a bowl of soup before dinner and more before breakfast. After a night's sleep, the body will lose more water. At this time, drinking more soup can replenish the water lost in the body and is beneficial to the human body.
3. Kindergarten teaching plan. All kinds of eggs
Small Class Science Teaching Plan in Kindergarten: Various Eggs
First, the design ideas
In order to further stimulate children's interest, the children visited the vegetable market next to the kindergarten and learned about the types and names of eggs through contact with the salespeople. Through the window of home and communication with parents, parents, teachers and children were mobilized to collect pictures in kind, which expanded their understanding of eggs. It can be said that children have a strong curiosity and interest in the world around them. Their understanding depends largely on their actions. It is very interesting for them to have a look, touch and taste. In order to further expand the theme of eggs, I specially preset this exploration activity, aiming to let the children in this class explore and understand the shape and structure of eggs through various senses. Further accumulate knowledge and experience about eggs. Children in small classes are only the initial stage of cultivating emotions. In this activity, it is very beneficial for children's lifelong development to let them be modest and share their own eggs, and at the same time stimulate their strong desire to explore in the process of exploration, laying a good foundation for their follow-up study.
Second, the activity objectives:
1, guide children to use their senses, explore the shape and structure of eggs, and accumulate knowledge and experience about eggs.
2. Initially cultivate children's comparative judgment ability.
3. Initially cultivate children's awareness of sharing with peers.
Third, activity preparation
1, let the children bring all kinds of eggs from home and hide them in the "Woods" around the classroom.
2. An opaque cloth bag contains duck eggs, eggs, goose eggs, quail eggs and so on.
3. Take a plastic bowl in hand and put an empty bowl and towel in the center of each table.
4. Arrange pictures about eggs collected by parents and teachers of children on the activity room wall.
Fourth, the activity process:
Play → try → taste → extend.
(1) Have some fun
1, take a look at the pocket.
Teacher: Can you guess what's in your pocket? (Inspire children to guess by sight and touch)
2. The teacher took out the baby eggs in his pocket one by one, and asked the children to count them and name them.
Step 3 find an egg baby
Let the children freely go to the "forest" to find the egg baby and have a look at each other.
Teacher: What kind of eggs are you looking for? What is big? What egg is small?
(2) Give it a try
1, arouse the desire to eat eggs
Teacher: Do you like eggs? What should I do first to eat eggs? (Remind children to put peeled eggshells in the bowl)
2. Children are free to explore and try to distinguish between raw eggs and cooked eggs.
Teacher: Can you eat all your eggs? Why? What's in the raw egg? What's in the boiled egg?
3. Children discuss and communicate
4. Summary
(3) Have a taste
1, let the children try boiled eggs.
2. Inspire children to share boiled eggs with others.
(4) Extension
The teacher tasted the salted egg and shared it with several children, prompting the children: Why are some of the eggs you eat light and some salty? What happened? Further stimulate children's desire to explore other eggs.
4. How to write the kindergarten science lesson plan "All kinds of eggs"
Teaching content: all kinds of eggs
moving target
1. Observe all kinds of eggs.
3. Know the shape, color and size of duck eggs, quail eggs, duck eggs, turtle eggs and snail eggs.
Teaching focus
By observing and operating the activity courseware, I am interested in exploring all kinds of eggs.
Activities to be prepared
1, several kinds of eggs (such as eggs, duck eggs, preserved eggs, tea eggs, pigeon eggs ...).
2. Information and courseware about eggs.
Activity flow:
First, the introduction of speculation
Second, explore all kinds of eggs
1. Ask parents to help collect different kinds of eggs in advance.
2. Show the collected eggs and let the children observe the shapes, sizes and colors of various eggs and compare them.
3. Let the children operate the activity courseware and know and know different eggs.
4. Break (peel) the eggs collected by the children, and let the children look inside the eggs. What are the differences and why?
5. Cut the boiled eggs and share them with the children; Please stir the raw eggs in turn and cook an egg soup.
Three. abstract
5. Kindergarten teaching plan. All kinds of eggs
Science lesson plans for small classes in kindergartens: all kinds of eggs I. Design ideas In order to further stimulate children's interest hotspots, children visited the vegetable market next to the kindergarten and learned about the types and names of eggs through contact with salespeople; Through the window of home and communication with parents, parents, teachers and children were mobilized to collect pictures in kind, which expanded their understanding of eggs.
It can be said that children have a strong curiosity and interest in the world around them. Their understanding depends largely on their actions. It is very interesting for them to have a look, touch and taste. In order to further expand the theme of eggs, I specially preset this exploration activity, aiming to let the children in this class explore and understand the shape and structure of eggs through various senses.
Further accumulate knowledge and experience about eggs. Children in small classes are only the initial stage of cultivating emotions. In this activity, it is very beneficial for children's lifelong development to let them be modest and share their own eggs, and at the same time stimulate their strong desire to explore in the process of exploration, laying a good foundation for their follow-up study.
Activity goal: 1. Guide children to use their senses, explore the shape and structure of eggs and accumulate knowledge and experience about eggs. 2. Initially cultivate children's comparative judgment ability.
3. Initially cultivate children's awareness of sharing with peers. Third, activity preparation 1, let the children bring all kinds of eggs from home and hide them in the "Woods" around the classroom.
2. An opaque cloth bag contains duck eggs, eggs, goose eggs, quail eggs and so on. 3. Take a plastic bowl in hand and put an empty bowl and towel in the center of each table.
4. Arrange pictures about eggs collected by parents and teachers of children on the activity room wall. Activity flow: play → try → taste → expand (1) play 1 and guess the pocket teacher: Can you guess what's in your pocket? (Inspire children to guess by sight and touch) 2. The teacher took out the baby eggs in his pocket one by one, and asked the children to count how many there were and name the eggs. 3. Find the baby eggs and let the children freely go to the "Woods" to find the baby eggs and look at each other.
Teacher: What kind of eggs are you looking for? What is big? What egg is small? (2) Try 1. Arouse the desire to eat eggs Teacher: Do you like eating eggs? What should I do first to eat eggs? Remind the child to put the peeled eggshell in the bowl. Children are free to explore and try to distinguish between raw eggs and cooked eggs. Teacher: Can you eat all your eggs? Why? What's in the raw egg? What's in the boiled egg? 3. Children discuss and communicate. Summary (3) Taste 1 Let the children taste the boiled eggs.
2. Inspire children to share boiled eggs with others. (4) Extend the teacher to taste salted eggs and share them with several children, prompting children: Why are some eggs you eat light and some salty? What happened? Further stimulate children's desire to explore other eggs.
6. Talking about the interesting focus of egg classroom activities in preschool teacher education
Functions of this activity:
This activity is in sub-topic 4 of next semester's nave class, What is this egg?
Second, the design intent:
In the theme of this activity, "What is this egg?"
I learned that "egg" is a mysterious world in children's eyes. This is a mystery, an endless story. The children's initiative to explore deeply touched me, and I realized that every child has unlimited development potential.
Yes, so I changed the goal of "interesting eggs" to further cultivate children's observation ability, language expression ability and hands-on operation ability.
Third, learning network:
Fourth, the activity design:
1, dynamic content: interesting eggs
2. Activity objectives:
(1) Explore the eggs of different oviparous animals.
(2) Understand the structure of eggs.
(3) Cultivate children's observation ability, language expression ability and hands-on operation ability in the process of understanding eggs.
(4) Enjoy the fun of life while tasting egg products.
(5) Abandoned eggshells can be made into handicrafts.
2. Activity form: group or group.
3. Activity preparation:
(1) Some duck eggs, eggs, quail eggs, goose eggs, pigeon eggs, etc. And some egg products (cakes, egg rolls, tea eggs, etc. ).
(2) the literacy card "egg".
(3) Each person has a bowl, a spoon, an egg, a mop, a rice cooker and vegetable oil.
(4) Broken eggshells (eggshells with a small hole at one end only).
(5) Music tapes.
4. Activity flow:
(1) Let the children discuss where the eggs of different egg-laying animals such as duck eggs, quail eggs and goose eggs come from, the names of the eggs, and the shapes and colors of the eggs.
(2) Show the literacy card "Eggs".
(3) Wash and dry the eggs in advance, then give each child a different egg and let the children touch it to see if its eggs are different from others' eggs.
(4) Let the children beat the eggs themselves, discover the secrets in the eggshell and know the structure of the eggs.
(5) Teacher's summary: Any egg-laying animal has "egg yolk and egg white" in its big shell.
(6) Ask children whether they eat eggs every day and why. Understand the nutritional value of eggs.
(7) Children discuss the uses of eggs: for example, cooking and making snacks.
(8) Use the eggs opened by children to make scrambled eggs with tomatoes and give them a taste.
1 discuss the storage method of eggs with children.
(2) Play music, invite children to eat buffet, taste all kinds of egg products and enjoy the fun of life in beautiful melody.
(3) Ask children to make different crafts with discarded eggshells, such as tumblers.
5. Summarize and share:
Please tell the children what eggs taste like. I like food made of eggs best.
6. Dynamic evaluation:
(1) You can read "egg".
(2) Exercise children's observation ability, language expression ability and hands-on operation ability.
(3) Waste eggshells can be made into handicrafts.
(4) Eat buffet in beautiful music, give children beautiful enjoyment and happy life.
7. Activity expansion:
Let children explore how to make eggs float.