What interesting chemical reactions have you seen?

At the time of baking, milk carton baking powder is mixed with flour, or vinegar and baking soda are mixed, and then the "volcanic effect" occurs, and the process undergoes a double displacement or metathesis reaction. The reaction process between vinegar and baking soda is roughly as follows: HC2H3O2(AQ) +NaHCO3(AQ) NAC2H3O2(AQ) +H2O(AQ) +CO2(G).

Cut out of aluminum skin into a duck shape (rabbit, cat, mouse......Whatever), use a cotton swab dipped in HGNO3 solution to apply to the aluminum skin, and after a few minutes, the HGNO3 on the aluminum skin will be dry. Then you can see the aluminum duck automatically grow white hair! Experimental Principle:

Aluminum is a reactive metal, but because there is a dense oxide film on the surface of aluminum, it prevents the reaction of aluminum with air. After the HGNO3 solution is coated, the dense oxide film is destroyed, and the Al-HG alloy is formed at the same time, so that the dense oxide film can no longer be formed on the Al surface. Al can continuously react with oxygen in the air to form white Al2O3.

Dissolve sodium silicate (Na2SiO3) in water to make a water glass with a solute mass fraction of 40, and gently add the salt grains, such as cobalt, iron, copper, nickel and lead chloride, aluminum, iron, copper and nickel sulfate, cobalt, iron, copper and nickel nitrate, to the water glass (note not to shake and mix), then the colorful "flowers" will grow slowly.

Fill half a glass of water in a glass, put a dozen potassium chlorate crystals on the bottom of the water, and then use tweezers to pick up a few small grains of yellow phosphorus and put them into the potassium chlorate crystals. Then use a glass pipette to absorb a small amount of concentrated sulfuric acid and transfer it into a mixture of potassium chlorate and yellow phosphorus, at which point there is a fire in the water. Isn't fire in water "fire and water compatible"?

Take an egg, wash off the grease on the surface and wipe dry. Use a brush dipped in acetic acid and write on the eggshell. After the acetic acid evaporates, the eggs are cooked in a dilute copper sulfate solution, and the shell is peeled off when the eggs have cooled, leaving clear blue or purple handwriting on the egg white, but leaving no traces on the shell.

Blowing air to make a fire, sodium peroxide can react with carbon dioxide to produce oxygen and release a large amount of heat, so that the cotton is set on fire and burned.

Take a small amount of potassium permanganate crystals and put them on the surface dish (or glass sheet), drop concentrated sulfuric acid on potassium permanganate, dip it with a glass rod, and touch the wick of the alcohol lamp, and the alcohol lamp is lit immediately.

Over time, the iron turns a red color, and the flaky cladding is called rust. The patina and silver discoloration that form the surface of copper in everyday life fall into this category.

Potassium permonate plus sulfuric acid plus aluminum, magnesium plus red phosphorus plus gasoline.

1) The substances that can make bromine water fade or change color and the relevant chemical reaction principles are as follows:

Unsaturated hydrocarbons such as olefins, alkynes, and diolefins react to fade bromine water.

ch2=ch2+br2——→ch2br-ch2br

ch≡ch+br2——→chbr=chbr

or CH+2BR2 – CHBR2-CHBR2

ch2=ch-ch=ch2+br2——→ch2br-ch=ch-ch2br

or ch2=ch-ch=ch2+br2-ch2-ch-chbr-ch=ch2).

It reacts with phenol to form a white precipitate.

It reacts with aldehydes and other aldehyde substances to fade bromine water.

ch3cho+br2+h2o=ch3cooh+2hbr

Mixed with benzene, toluene, carbon tetrachloride and other organic solutions, the bromine water fades due to extraction, and the organic solvent dissolves the bromine orange (or brownish-red).

React with alkaline solutions (such as NaOH solution, Na2CO3 solution, etc.) to fade bromine water.

BR2+2NAOH=NABR+NABro+H2O (or 3BR2+6NAOH=5NABr+NAB3+3H2O).

br2+na2co3=nabr+nabro+co2

It reacts with strong inorganic reducing agents (such as H2S, SO2, Ki and FeSO4, etc.) to discolor bromine water.

BR2+H2S = 2HBR+S (light yellow precipitate).

br2+so2+2h2o=2hbr+h2so4

3br2+6feso4=2fe2(so4)3+2febr3

BR2+2Ki=2KBR+I2 (paralytic signaling solution turns brown).

2) The substances that can make potassium permanganate solution fade and the relevant chemical reaction principles are as follows:

reacts with unsaturated hydrocarbons such as olefins, alkynes, and diolefins to fade the potassium permanganate solution; It reacts with benzene congeners (toluene, ethylbenzene, xylene, etc.) to fade the acidic potassium permanganate solution.

A redox reaction occurs with phenol to discolor the potassium permanganate solution.

Redox reaction occurs with aldehydes and other aldehyde organic matter, which fades the potassium permanganate solution.

It reacts with inorganic reducing agents with reducing properties (such as H2S, SO2, FeSO4, Ki, HCl, etc.) to fade the potassium permanganate solution.

3) Summarize "substances that discolor both potassium permanganate solution and bromine water" include:

The substances that can not only fade the acidic potassium permanganate solution, but also fade the bromine water include organic matter with C=C double bond, C triple bond and aldehyde group (—CHO) in the molecular structure; Phenol and inorganic reducing agents. Benzene congeners can only fade the acidic potassium permanganate solution in it; Organic extractants can only make the bromine water in it fade and brighten.

Common chemical reactions: synthesis, cellular respiration, combustion, rusting, batteries, etc.

1. Photosynthesis: Photosynthesis usually refers to the process in which green plants (including algae) absorb light energy, turn carbon dioxide and water into energetic organic matter, and release oxygen at the same time. It mainly includes two stages: light reaction and dark reaction, which involve important reaction steps such as light absorption, electron transfer, photosynthetic phosphorylation, and carbon assimilation, which is of great significance for realizing the energy conversion in nature and maintaining the carbon-oxygen balance of the atmosphere.

2. Cellular respiration: Cellular respiration refers to the process of organic matter undergoing a series of oxidative decomposition in cells to generate carbon dioxide or other products, release energy and generate ATP. Within a certain range, the intensity of cellular respiration increases with the increase of water content and decreases with the decrease of water content.

3. Combustion: Combustion is a kind of exothermic and luminescent chemical reaction, the reaction process is extremely complex, the chain reaction of free radicals is the essence of the combustion state mining reaction, and light and heat are the physical phenomena that occur during the combustion process.

4. Rust: Rust is a chemical reaction, which is essentially an oxidation reaction of metals. The most common phenomenon of rust is that iron products are oxidized by long-term exposure to air and oxygen, or are eroded by oxygen in water to become oxides.

5. Battery: The battery uses electrochemical or redox reactions to convert chemical energy into electrical energy. The spontaneous redox reaction occurs in the galvanic cell, while the non-spontaneous chemical reaction occurs in the electric sail Sakura nuclear decomposer.

C + O2 = ignition = CO2 burns violently, white light, exothermics, and makes lime water turbid.

2c + o2 = ignition = 2co common reactions in coal furnaces, air pollutants.

1. Causes of gas poisoning.

Carbon monoxide is burned in oxygen: 2CO + O2 = ignition = 2CO2 Blue flame gas combustion.

Methane burns in air: CH4 + 2O2 = ignition = CO2 + 2H2O Blue flame, exothermic, combustion of methane and natural gas.

Alcohol burns in the air: C2H5OH + 3O2 = Ignition = 2CO2 + 3H2O Blue flame.

Charcoal reduced copper oxide: C + 2CuO high temperature 2Cu + CO2

Water vapor passes through the scorching carbon layer: H2O + C high temperature H2 + Co

Coke reduced iron oxide: 3C + 2Fe2O3 High temperature 4Fe + 3CO2

Other methane burns in the air: CH4 + 2O2 ignites CO2 + 2H2O

Alcohol burns in air: C2H5OH + 3O2 igniting 2CO2 + 3H2O

Carbon monoxide reduced copper oxide: CO + Cuo Cu + CO2

Carbon monoxide reduces iron oxide: 3CO + Fe2O3 high temperature 2Fe + 3CO2

Carbon dioxide passes through clarified lime water (test carbon dioxide): Ca(OH)2 + CO2 ==CaCO3 + H2O

Sodium hydroxide and carbon dioxide reaction (carbon dioxide removed): 2NaOH + CO2 ==Na2CO3 + H2O

Reaction of limestone (or marble) with dilute hydrochloric acid (laboratory method of carbon dioxide):

caco3 + 2hcl ==cacl2 + h2o + co2↑

Marble reacts with dilute hydrochloric acid: CaCO3 + 2HCl ==CaCl2 + H2O + CO2

Sodium carbonate reacts with dilute hydrochloric acid: Na2CO3 + 2HCl ==2NaCl + H2O + CO2

C + Cuo High temperature 2Cu + CO2 black gradually turns red, producing a gas that makes the clarified lime water turbid, smelting metal.

Cuo + Co Cu + CO2 black gradually turns red, producing a gas that makes the clarified lime water cloudy for smelting metals.

CO2 + H2O = H2CO3 Carbonic acid turns litmus red proves the acidity of carbonic acid.

H2CO3 CO2 + H2O litmus red fade.

Ca(OH)2 + CO2= CaCO3 + H2O Clarified lime water becomes turbid Apply CO2 inspection and lime mortar to paint the walls.

CaCO3 + 2HCl = CaCl2+ H2O + CO2 Solids gradually dissolve, there is a gas that makes the clarified lime water turbid Carbon dioxide is prepared in the laboratory, and the scale is removed.

It should be enough.

Have you ever seen such a miraculous chemical reaction? Check it out!

Go to the field and boil eggs without a fire.

Principle: Quicklime and water react to exothermic.