Does anyone know what chemistry is actually used for?

There are a wide range of aspects of this application, and there are already a lot of just introducing a "vinegar":

Nail polish does not fall off for a long time: Before applying nail polish, wipe the nails clean with cotton dipped in vinegar, and then apply nail polish after the vinegar is dry, so that the nail polish will not fall off easily.

If the sweater is worn for a long time, some parts will be polished and shiny, so you can spray it on the shiny part with a mixture of vinegar and water, and then wash it to return to its original state.

When steaming the steamed buns, the steamed buns are yellow, you can add an appropriate amount of vinegar to the pot, and after steaming for a while, the steamed buns will turn white.

When simmering bone broth, add a few drops of vinegar first to make it easier to absorb. The main component of bones is calcium hydroxyphosphate, and the addition of acetic acid can convert calcium hydroxyphosphate into calcium salts that are easy for people to absorb

The role of vinegar is also very large, in addition to seasoning, it can also help the human body to digest, in addition to vinegar is acetic acid, it is corrosive, can eliminate the dirt on the inner wall of thermos flasks and pressure cookers.

Another example is the burning of fossil fuels, after you have studied chemistry, you can calculate how to make the best use of heat, and so on.

The manufacture of chemical products, the separation and purification of minerals, environmental testing and protection, etc.

Medicine, textile, leather making, papermaking, materials science, engineering, inspection and testing, energy development, automotive, aviation, research, education, what more do you want?

Chemical properties are: acidic, alkaline, flammable, flammable, corrosive, oxidizing, reducing, dehydrating, metallic, non-metallic, etc.

The common acidic substance is vinegar, and the alkaline substance is edible alkaline noodles and baking soda.

Dehydration is the corrosiveness of concentrated sulfuric acid: concentrated sulfuric acid is coated on white paper, and the white paper is carbonized instantly, and metallic and non-metallic properties are all about the ability to gain and lose electrons.

Chemical properties and chemical changes are inherent properties of any substance, such as oxygen, which has flammability as its chemical property; At the same time, oxygen can react with hydrogen to produce water, which is its chemical property. Any substance is distinguished from other substances by its very different chemical properties and chemical changes; Chemical properties are the relative restiness of a substance, and chemical change is the relative motion of a substance.

1) Potassium permanganate produces potassium manganate, manganese dioxide and oxygen under heating conditions, and the chemical equation of the reaction is 2kmNO4

k 2 mno 4 +mno 2 +o 2 ↑；The reaction conforms to the characteristics of the reactant that there is only one of them, and belongs to the fast hydrolysis reaction.

2) Calcium hydroxide reacts with carbon dioxide to form calcium carbonate precipitate and water; Therefore, the answer is: Ca(OH) 2 +Co2 = CaCo3 +H2O, and the reactants and products of this reaction are not one, so they belong to neither the chemical reaction nor the decomposition reaction;

3) Magnesium can emit dazzling white light when it is burned in a clear state, so it can be used to make fireworks and flares Magnesium combustion is the reaction of magnesium and oxygen under ignition conditions to produce magnesium oxide The chemical equation of the reaction is: 2mg+O2 ignition.

2mgo；There is only one product of this reaction, so it belongs to the chemical reaction;

So the answer is: (1) 2kmno 4

k 2 mno 4 +mno 2 +o 2 ↑；2）ca（oh） 2 +co 2 =caco 3 ↓+h 2 o；(3) 2mg+O2 ignition.

2mgo；（2）

Chemical substance: sulfuric acid (chemical formula: H2SO4), is one of the most reactive binary inorganic strong acids, which can react with many metal scatters.

Pros: 1. High concentration of sulfuric acid has strong water absorption, which can be used as a dehydrating agent, carbonized wood, paper, cotton and linen fabrics and biological skin and meat and other carbohydrate-containing substances.

2. It is an important industrial raw material, which can be used to make fertilizers, medicines, explosives, pigments, detergents, batteries, etc.

3. It is widely used in purification of petroleum, metal smelting and dye industries. auspicious travel.

Disadvantages: 1. It has strong corrosiveness and oxidation, and improper use will cause burns.

2. Sulfuric acid is not flammable, but when it reacts with metal, flammable hydrogen will be released, which may lead to **, and concentrated sulfuric acid, which is a strong oxidizing agent, will release toxic sulfur dioxide when it reacts with metal redox, threatening the health of workers.