What can be used to clean vegetable oil from the walls of test tubes?

The most accurate way to put it is: organic solvents.

Dish soap and soap are included

Reason: similar to the principle of compatibility, that is to say, vegetable oil is composed of organic molecules, which is easy to dissolve in organic molecules, but not easy to dissolve in inorganic solutions, such as water and salt water, which cannot dissolve vegetable oil.

Supplement: It is possible to use alcohol and gasoline, both of which are organic solvents!!

In fact, dish soap and other substances can dissolve vegetable oil not because it is an organic molecule, they have a long organic chain, but the other end is a water-soluble molecule, such as a salt molecule, so that it can hold one end of the vegetable oil molecule on the one hand, and when it is rinsed, it can also hold the water molecule, and it will be washed down by the water This is also the case with soapy water. Specifically, you can look at the molecular structure.

Wash and clean (similarity principle).

You're a test tube, which is generally used in the laboratory to be cleaned and cleaned, and the removal effect is not as good as that of professional removal.

Usually in the laboratory, it is washed with petroleum ether, the effect is very good, and the alcohol is also good, if it is washed with gasoline, it can also be washed, but the smell of gasoline volatilization is not very good.

In fact, it's still very simple, just heat it a little, and then add some washing and cleaning.

It is best to wash it with a saturated sodium carbonate solution, or sodium hydroxide, to hydrolyze it! Because oil is a glyceride of unsaturated fatty acids.

Hot soda ash solution is a textbook method.

Alkali solution, dish soap, laundry detergent are all available.

a. Use gasoline to remove the oil stains on the clothes, which is used as a solvent to dissolve the oil stains and form a dissolved liquid;

b. Use alcohol to remove the iodine attached to the inner wall of the test tube, which is used as a solvent to dissolve the iodine and form a solution;

c. The detergent can not completely dissolve the oil stain, but it plays an emulsifying role, dispersing the original oil into countless small droplets without pollution and integrating large oil droplets, which can flow away with the water;

d. Wash off the potassium nitrate attached to the bottom of the beaker with hot water, which is dissolved in water to form a solution;

Answer: c

First of all, under the action of bile in the small intestine, fat is turned into fat particles, which increases the contact area with digestive enzymes, and then is digested into glycerol and fatty acids under the action of enzymes in intestinal fluid and annihilated pancreatic juice

Therefore, the crack c

When there is a substance in the test tube that should not be washed off, it is necessary to use a test tube brush to scrub it early, and when there is an oil stain, use a test tube brush dipped in a washing powder solution or soapy water to scrub It can also be washed with gasoline, because gasoline can dissolve grease and form a solution, so it is not advisable to choose B