What are some small scientific experiments, what should be prepared, and write the conclusion simply and clearly
The magical power of chopsticks
Thinking: insert a chopstick into the Put the rice in the cup and then lift the chopsticks up. Will the chopsticks lift the rice and the cup?
Materials: One plastic cup, one cup of rice, one bamboo chopstick
Operation:
1. Fill the plastic cup with rice.
2. Press the rice in the cup with your hands.
3. Hold the rice with your hand and insert the chopsticks between your fingers.
4. Gently lift the chopsticks with your hands, and the cup and rice will be lifted together.
Explanation:
Due to the squeezing between the rice grains in the cup, the air in the cup is squeezed out. The pressure outside the cup is greater than the pressure inside the cup, causing the chopsticks and the rice grains to be in contact with each other. The two are tightly joined together, so the chopsticks can lift the rice cup.
Bottle Race
Thinking: Two bottles of equal weight containing sand and water roll down from a height. Who reaches the finish line first?
Materials: two bottles of the same size and weight, sand, water, a rectangular wooden board, two thick books
Operation:
1. Use The rectangular wooden board and the two books form a slope
2. Pour the water into another bottle and pour the sand into the bottle
3. Place the two bottles on the wooden board , let the two bottles roll down at the same starting height
4. The bottle filled with water reaches the end point earlier than the bottle filled with sand
Explanation:
The friction of sand against the inner wall of the bottle is much greater than the friction of water against the inner wall of the bottle, and there is also friction between the sand, so it slides slower than the bottle filled with water.
Creation: Change the substances in the bottles and let them compete!
Electrically charged newspapers
Thinking: Without glue, tape or other adhesives, newspapers can be stuck on the wall without falling off. Do you know why?
Materials: 1 pencil; 1 newspaper.
Steps:
1. Unfold the newspaper and lay it flat on the wall.
2. After quickly rubbing the side of the pencil on the newspaper a few times, the newspaper will not fall off as if it is stuck to the wall.
3. Lift up a corner of the newspaper and then let go. The lifted corner will be sucked back by the wall.
4. Slowly peel the newspaper off the wall and listen for the sound of static electricity.
Instructions:
1. Rub the pencil to charge the newspaper.
2. The charged newspaper was sucked to the wall.
3. When the air in the house is dry (especially in the winter), if you peel the newspaper off the wall, you will hear the crackle of static electricity.
Creation: Please try it, what other items can be stuck on the wall using static electricity without using adhesives
Separation of pepper and salt
Thinking: I accidentally mixed the kitchen seasonings: pepper and salt together. How to separate them?
Materials: pepper, salt, plastic spoon, small plate
Operation:
1. Mix salt and pepper together.
2. Stir evenly with chopsticks.
3. Rub the plastic spoon on the clothes and place it on top of the salt and pepper.
4. The pepper adheres to the spoon first.
5. Move the plastic spoon downward slightly.
6. The salt sticks to the spoon.
Explanation:
The reason why pepper is electrostatically adsorbed earlier than salt is because its weight is lighter than salt.
Create:
Can you use this method to separate other mixed ingredients?
Electric Balloons
Thinking: Under what circumstances will two balloons attract each other, and under what circumstances will they repel each other?
Materials: Inflated Balloons 2 , 1 piece of string, 1 piece of cardboard
Operation:
1. Inflate the two balloons separately and tie a knot at the mouth.
2 Connect the two balloons with a thread.
3. Rub the balloon on your hair (or sweater).
4 Lift the middle part of the string, and the two balloons immediately separate.
5 Place the cardboard between the two balloons, and the electricity on the balloons causes them to be attracted to the cardboard.
Explanation:
1 The electricity on one balloon repels the electricity on the other balloon.
2 The electricity on the two balloons causes them to be attracted to the cardboard.
Create: Can you use other small experiments to show that the balloon is charged?
Cute watermarks
Thinking: How are the beautiful patterns on rice paper made if they are not drawn?
Materials: 1 washbasin, 1-2 pieces of rice paper, 1 chopstick, 1 cotton swab, 1 bottle of ink, water (about half a basin)
Operation:
p>1. Pour half a basin of water into the basin and gently touch the water with chopsticks dipped in ink. You will see that the ink expands into a circle on the water.
2. Take a cotton swab and rub it on the scalp two or three times.
3. Then tap the center of the ink circular pattern to see what happens.
4. Gently cover the calligraphy paper on the water, and then slowly pick it up. What pattern is printed on the paper?
Explanation:
1. When the cotton swab is touched, the ink will expand into an irregular circle shape.
2. The small amount of oil applied when the cotton swab is rubbed on the scalp will affect the force of water molecules pulling each other.
3. The watermark will appear irregular...gt;gt;
Are there any fun science experiments that require simple materials, preferably those needed in daily life
There are many interesting home experiments. The materials are very simple and easy to complete. Here are a few small experiments I have done myself. They are all seen from the WeChat public account "Xiaodoujia Laboratory". Every day Recommended one, very interesting
(1) Candle seesaw
Experimental materials
Candles (two) Goblet (two) Straw lighter Sewing needle
Experimental steps
Insert two candles at both ends of the straw
(Note: the straw must be slightly thicker than the candle, otherwise it will not be inserted; if the straw If it is thinner, you need to use a knife to gently cut off some of the bottom of the candle to make it thin enough to insert into the straw)
Insert a sewing needle in the middle of the straw
(Note: It must be ensured that it is in the middle, because the balance between the two ends of the straw must be maintained. If you are afraid of making a mistake, you can use a ruler to measure it to ensure that the sewing needle is inserted into the middle point.)
Place the two cups in parallel rows Place the sewing needle between the two cups
(Note: You must ensure that the sewing needle can maintain balance when placed on the cup. If not, use a knife to trim off some of the heavier ends. Candles. You can place a piece of paper under the candle to prevent candle oil from dripping on the table.)
Use a lighter to light both ends of the candle in turn~~~~~ La la la, it’s time to witness the miracle. We will see two candles as if they are playing on a seesaw. The left side sinks and the right side rises. The right side sinks and the left side rises. They keep going up and down. It's so amazing!
Experimental Principle
We have all played with a seesaw. In fact, a seesaw is an equal-arm lever. If both ends are equally heavy, they will maintain balance. Whichever end is heavier will sink, and the other end will sink. then rises.
The principle of the candle seesaw is the same. When the candle is not lit, both ends have the same weight, so they are in a balanced state. When we light candles, there is a sequence. The end that is lit first burns (set as end A), the wax liquid drips, the weight of this end decreases, and the seesaw tilts toward the other end (set as end B). At this time, end A is facing up and end B is facing down. A flame will appear on the downward end to grill the candle and accelerate the melting of the candle. However, the upward end A will not, so the wax liquid on end B melts and drips quickly. The weight decreases rapidly, which causes the weight of end A to be greater than the weight of end B. End B tilts downward, the candle melts quickly, and the weight decreases rapidly. In this way, the candle will continue to move up and down like a child playing on a seesaw.
(2) Floating eggs
Experimental equipment
Eggs (two) Glass cups (two) Salt water
Experiment Steps
1. Add the same amount of water to the two cups. The height of the water should be enough to submerge the eggs.
2. Place two eggs into two water cups respectively, and observe with your child whether the eggs float or sink. (Phenomenon: Both eggs sink to the bottom of the cup)
3. Let the child choose one of the cups, and the parents and the child pour salt into the selected cup together.
4. Observe the changes in eggs after adding salt with your children. (Phenomena: Eggs in a glass of salted water slowly float)
Experimental principle:
Whether an object floats or sinks in water is determined by the density contrast between the two. When the density of an object is greater than the density of the liquid, it will sink. Eggs sink when placed in water because the density of eggs is greater than the density of water. We added salt to the cup, and the density of the salted water increased. Eventually, the water in the cup became denser than the egg, so the egg could naturally float!
(3) When Coke meets milk
Materials
Coke (1 bottle), pure milk (1 cup)
Steps
1. Pour half of the Coke out of the bottle.
2. Add milk to Coke bottle.
(Phenomena: After encountering milk, Coca-Cola "boils" quickly and begins to bubble. The liquid in the bottle begins to divide into three layers. The color of the bottom layer is darker brown, and the middle layer is light brown. Brown, the top layer is foamy liquid)
3. Let the mixed liquid stand for 1 hour.
(Phenomena: the color of the liquid in the bottle turns to earthy yellow, and there are some small floc suspended matter at the bottom of the bottle)
Principle
In milk Containing casein and calcium ions, Coke is a carbonated drink. When milk is added to cola, a flocculent precipitate forms in the solution. Some of this precipitate is casein that precipitates when it reaches the isoelectric point under the flocculation phenomenon, and there is also a small amount of carbonate ions that react with calcium ions to form a white precipitate of calcium carbonate. ...gt;gt;
A small science experiment to see that everything is upside down
The human eye is equivalent to a convex lens. When light enters the human eye, it becomes upside down. The real image is on the retina, so when you see things, they are upside down.
Unknown question
Are there any small scientific experiments that can be done at home with children?
1. Bread mold
Prepare a glass Bottle, foil, wire, water and a slice of bread.
Hang the bread slices on the wire and put them in the glass bottle. Then, put some water in the bottle so that the bread gets damp but the water cannot soak the bread slices. Cover the mouth of the bottle with foil to keep the bottle
moist inside. In this way, mold will grow on the bread slices.
2. Phototropism of plants
Plant morning glory seeds in a small flower pot, wait until they sprout and grow into seedlings, and put them in a shoe box. The flower pot is tight Against the side of the shoebox. Use hard paper to make a partition inside the box, leave a little space below, and open a small window on the other side.
Close the lid and place the shoe box on the balcony.
After a week, morning glory seedlings will poke their heads out of the small window.
3. Mixing oil and water
Pour half a bottle of water into a small transparent glass bottle, and then pour some vegetable oil. At this time, the oil floats on the water and the boundaries are clear. Shake the glass bottle with your hands to force the oil and water to mix, and let it sit for a while.
The oil and water will separate into two layers: upper and lower. At this time, add a little detergent (or washing powder) into the small glass bottle, then shake the bottle fully, and observe again. You can see that the oil and water are no longer divided into two layers, but mixed together.
Are there any small scientific experiments that you can recommend? I want to compete, thank you!
For example, for invisible letters, first use vitamin C powder dipped in water to write, and then brush the entire paper surface with potassium permanganate to change color. Another example is the thermite reaction and the Pharaoh's tree.
What does it mean to use the basic steps of primary school science experiments
That is, the experimental steps for doing the experiment, as in How to do it and so on, basically refers to the simplest one