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Anonymous users2024-01-24A. Kitchen detergent has the effect of dissolving oil stains, which is wrong and should be emulsified;
B. Ice is put into water, ice is a solute, water is a solvent, the statement is wrong, it is a substance, not a solution;
C. The ice pack made of NaCl dissolved in water to cool down patients with high fever is wrong;
D. Sprinkle salt on the snow on the road in winter, which can make the ice and snow melt quickly, which is correct, because the freezing point of the salt dissolved in water to form a solution is lower than that of water, so that the ice and snow can also melt at a lower temperature
So choose D
A mistake: After washing the oil stain with the detergent, it cannot form a real solution, but only an emulsion. It is an oil-water emulsion.
A. The detergent contains an emulsifier, which can turn the oil into fine oil droplets, thus forming an emulsion and being washed away, so it is wrong >>>More
Detergents have an emulsifying effect and can form an emulsion with grease and wash away with water.
Strong alkali ingredients, direct contact to the skin damage, rinse with water, harmless.
Chemical changes.
The main ingredient of detergent, also known as (detergent), is surfactant, which is an organic compound containing two parts of hydrophilic group and lipophilic group in the molecular structure. Generally, according to whether surfactants can be decomposed into ions in aqueous solution, they are divided into two categories: ionic surfactants and non-ionic surfactants. Ionic surfactants can be divided into three types: cationic surfactants, anionic surfactants and zwitterionic surfactants. >>>More