Why is it not afraid of chemical changes?

"Broken bones" describes the process by which quicklime reacts violently with water and releases a large amount of heat. Chemical changes are included in the process for the following reasons:

1.Decomposition reaction: calcium carbonate is decomposed into calcium oxide at high temperature, and the chemical equation is CaCO3==(heating)==CaO+CO2.

2.Chemical reaction: calcium oxide reacts with water to form lime, and the chemical equation is CaO+H2O==Ca(OH)2.

3.Metathesis reaction: calcium hydroxide absorbs carbon dioxide from the air to produce calcium carbonate, and the chemical equation is Ca(OH)2+CO2==CaCO3.

Thus, the process described by "not afraid to break bones" contains chemical changes.

Why is it a chemical change? Chemical change is the process by which Ca(OH)2 and CO2 react to form CaCO3. I am not afraid to leave my innocence in the world" is a physical change, a chemical change, a corresponding chemical reaction.

The equations are: CaCO3=CaO+CO2, decomposition reaction CaO+H2O=Ca(OH)2, chemical reaction.

ca(oh)2+co2= caco3+h2o.acid-base neutralization reaction,

Because there are "thousands of hammers chiseled out of the deep mountains, if the fire is burned, if you are idle, you are not afraid of broken bones, and you must leave your innocence in the world." "Burning lime is a chemical reaction. Therefore, it is said that "the body is not afraid of broken bones" is a chemical reaction.

Answer: Because of this phenomenon, the fundamental properties of matter have changed! And its mass is also greatly reduced.

Chemical change is the process by which Ca(OH)2 and CO2 react to form CaCO3. "It is a physical change, it is a chemical change, and the corresponding chemical reaction equations are: caCO3=cao+CO2, decomposition reaction cao+h2o=ca(oh)2, chemical reaction ca(oh)2+co2= caCO3 +H2O

acid-base neutralization reaction,

This poem comes from "Lime Yin", lime is calcium carbonate, and broken bones are calcium carbonate decomposition.

The chemical formula of quicklime is CaO, which is produced by the decomposition of calcium carbonate at high temperature, and the preparation equation is: CaCO3=CaO+CO2Quicklime is easy to react with water and carbon dioxide in the air, and when it reacts with carbon dioxide, cao+CO2=caCO3 occurs, and it reacts with water to form calcium hydroxide (hydrated lime), releasing a large amount of heat.

This poem is saying that the process of calcination of lime is a chemical change.

I am not afraid of broken bones, and it is a chemical change to leave innocence in the world. There are two reactions in this verse: the reaction of quicklime with water, and the reaction of calcium hydroxide with carbon dioxide, both of which are chemical changes.

The idea of solving the problem is that if there is no new substance, it is a physical change, and if there is a new substance, it is a chemical change.

Examples of chemical change and physical change:Physical changes: tri-state changes in water; The grinding of bile alum turns into powder; Molten iron is cast into an iron pot; Broken sticks; Salt dissolves in water and becomes brine; Hydration turns into ice; glass shattering; The vase is broken; Rice is ground into flour; The water freezes.

Chemical changes: combustion of magnesium strips; alkaline hail carbonate per mu of pure copper is decomposed by heating; Iron rusts in moist air; Gunpowder**; paper burning; Moldy food that is resistant to grades; Iron rusts; Combustion of magnesium; Basic copper carbonate is decomposed by heat; Wood burning.

No. It means that calcium oxide reacts with water to form calcium hydroxide, and hydroxide and calcium react with carbon dioxide in the air to form calcium carbonate precipitate and water, and new substances are generated, which is a chemical change. cao+h2o==ca(oh)2，ca(oh)2+co2==caco3↓+h2o。

Calcium oxide is an inorganic compound, and its chemical formula is CAO, commonly known as quicklime. The physical properties are white powder on the surface, gray-white for impurities, light yellow or gray when containing impurities, and hygroscopic.

Calcium hydroxide, an inorganic compound, with the chemical formula Ca(OH)2, commonly known as hydrated lime or slaked lime. It is a white powdery solid, after adding water, it is two layers, the upper layer of aqueous solution is called clarified lime water, and the lower layer of Xiangshen suspension is called lime milk or lime slurry. The upper layer of liquid clarified lime water can be used to test carbon dioxide, and the lower layer of turbid liquid lime milk is a building material.

Calcium hydroxide is a strong alkali, which has the ability to kill bacteria and antiseptic, and has a corrosive effect on ** and fabrics. Calcium hydroxide has a wide range of applications in industry. It is commonly used as a building material, and is also used as a fungicide and chemical raw material, etc.

When the ore is mined from the mountains, it is still only a limestone mine, which needs to be calcined and turned into calcium oxide before it can be used in industry and life.

The next sentence is "only innocence is left in the world", indicating that the product is a white substance.

caco3====cao+co2↑

If water is added to the chemistry, it should be CaO+H2O=Ca(OH)2.

If it is a multiple-choice question, the following chemical equation is correct; If it's a fill-in-the-blank question, then write both equations, and you won't be wrong.

Lime powder speaks of calcium carbonate, and calcium oxide plus water speaks of calcium hydroxide.

Calcium carbonate is calcined at high temperature to produce calcium oxide and carbon dioxide.