How to do a small experiment at home

Gauze filtration + charcoal filtration.

If 1 volume of soybeans is mixed with 1 volume of mung beans, is the resulting volume equal to the sum of these two volumes?

Mix 100 ml of water with 100 ml of alcohol, and the resulting volume is equal to 200 ml?

1) Experiment description.

What should I do if I don't have alcohol at home? Toilet water contains a lot of alcohol and can be used as a substitute for alcohol.

If you don't have a 100 ml graduated cylinder at home, you can use a 195 ml flower water bottle instead.

The mixing of soybeans and mung beans is not obvious, and it is better to replace mung beans with millet (or rice).

2) Experimental guidance.

1.Mix soybeans and millet.

Experimental supplies: 2 transparent glasses of equal volume, 1 large soup bowl, soybeans and millet.

Experimental steps: Take a full cup of soybeans (i.e., 1 volume of soybeans), take a full cup of millet (i.e., 1 volume of millet), pour the soybeans and millet in the cup into a large soup bowl and mix, put all the mixed soybeans and millet back into the glass, fill one cup to the brim, and observe whether the other cup is full.

Phenomenon: The other cup is not full, and can only be filled about 3 cm away from the mouth of the cup.

2.Mix the toilet water with water.

Experimental supplies: one bottle of toilet water (neck slender, 195 ml), about half a bottle of expired toilet water.

Experimental steps: Pour about half a bottle of water into an empty flower water bottle, then slowly pour about half a bottle of flower water to the mouth of the bottle, block the bottle mouth with your thumb, turn the bottle upside down, and then put it positively, repeat 2 times, mix the liquid in the bottle evenly, and observe whether the liquid level is lower than the bottle mouth.

Experimental phenomenon: the liquid level is significantly lower than the bottle mouth.

iii) Explanation of conclusions.

1 volume of substance A + 1 volume of substance B ≠ 2 volumes of mixture; There is a gap between molecules.

Add 2 tablespoons of sugar and appropriate amount of fruit juice to a 500 ml bottle, add about g of baking soda (sodium bicarbonate), pour in cold boiled water, add about g of citric acid, immediately tighten the cap, shake well, and put in the refrigerator. Half an hour later, you'll be ready to drink a cool and sweet soda.

In this experiment, citric acid can be replaced with fresh lemon juice.

Take an empty plastic beverage bottle, cut off the bottom, plug the bottle mouth with a single-hole plug with a catheter, turn the bottle upside down, and place the washed bulking cotton, gauze, activated carbon, quartz sand, small pebbles, etc. in layers from bottom to top in the bottle to get a simple water purifier.

Experiment description: Small pebbles and quartz sand should be washed, and small pebbles and quartz sand play a filtering role.

If you don't have a single-hole plug with a catheter at home, you can make a few small holes in the cap instead of a single-hole stopper with a catheter.

Dip some salt with chopsticks and burn it on the gas to observe the color of the flame.

Baking soda and vinegar are put into the bottle, the cap is screwed on, and the burning candle is extinguished.

The copper wire is burned on the gas stove to observe the color of the flame.

Wrap some "sodium peroxide" in absorbent cotton and blow on it or add a small amount of water to it, and it will spontaneously combust.

Hydrogen peroxide is filled with the bottle, and the residue of potassium permanganate burned on the gas stove is added to it, and the gas produced rekindles the sparkled wooden strips. Balance.

Add a little white vinegar on top of the egg shell, and you can see that there are bubbles; Make a glass of lime water and blow it in with a straw and you will see cloudiness.

1. Put a small piece of instant noodles into a beaker, add a certain amount of hot water, and then add iodine wine dropwise, the instant noodles will quickly turn blue-black, then add vitamin C tablet powder and shake, the instant noodles will return to their original color after half a minute, and the iodine wine in the beaker will also become clear;

2. Put the copper ring on the alcohol lamp and burn it until the color turns black, and then quickly dip the ring in alcohol, and the copper ring will quickly return to its original shape;

3. Use a juicer to squeeze the green apples into juice, the juice is light green for a short time, put it for a few minutes, the apple juice will soon become yellow and darker, add vitamin C tablet powder, stir and dissolve, and the apple juice will soon turn from yellow to light or to the original state.

Handmade soap. The main materials are lard and alkali, which can be weighed, sampled, stirred, etc., and finally the students choose a favorite mold and pour the mixed solution into it.

Handmade soap is made by using pure soap base purchased on the market, heating it to melt, adding pigments and flavors, and putting it into molds. The production process of the melting and remanufacturing method is relatively simple, which is suitable for handmade soap teaching. However, the transparent soap base contains chemicals that make the soap melt repeatedly, and glycerin, a by-product of the soap base making process, has also been removed, so the soap produced by melting and remaking is relatively unnatural.

You can also put four glasses of water, pick your favorite color, choose the color to drip into the glass, and then use a napkin as a bridge to connect the two glasses of water. Something magical happens, the colors are passed through paper towels. The ducts in the stems of plants are the tiniest capillaries in the plant, which absorb water from the soil and transport it to all parts of the plant.