The reaction between quicklime and water releases heat.
The reaction between quicklime and water is an exothermic reaction. In a chemical reaction, a reaction in which the total energy of the reactants is greater than the total energy of the products is called an exothermic reaction. Including combustion, neutralization, oxidation of metals, thermite reaction, reaction between metals and more active acids and reaction of unstable substances into stable substances.
Quicklime, also known as quicklime, is primarily composed of calcium oxide. It is generally obtained by calcining natural rocks whose main component is calcium carbonate at high temperatures to decompose into carbon dioxide and calcium oxide (chemical). formula: CaO, quicklime, also called marble). All natural rocks containing calcium carbonate as a main componentpal, such as limestone, chalk, dolomitic limestone, etc., can be used to produce lime. In coastal areas, shells are used as a raw material and are burned to produce shell ash, which is used as quicklime.
Quick lime generally contains superheated lime. Overheated lime slowly extinguishes. If quenching occurs after the lime slurry has hardened, it will cause swelling and cracking due to expansion caused by quenching. To eliminate the risks associated with overcooking the lime, the lime must be "aged" for approximately 2 weeks after slaking.
It is white (or gray, brown-white) in appearance, amorphous and absorbs water and carbon dioxide present in the air. Calcium oxide reacts with water to form calcium hydroxide and releases heat. Soluble in acidic water, insoluble in alcohol. TheyThis is an inorganic alkaline corrosive product, national dangerous regulation number 95006. There will be a chemical reaction between quicklime and water, then it will be immediately heated to a high temperature above 100°C.
Will water and lime undergo a chemical or physical reaction together? Will they produce toxic and harmful gases?
The equation is the same as above. just remember that
The combination releases heat
Decomposition endotherms
This is usually the case
The law Conservation of energy tells us that despite the material world constantly changing, but this type of change is by no means without constraints. The most fundamental constraint is the law of conservation, that is, all changes in motion must meet certain requirements, regardless of the material form to which they belong. to what material characteristics they reflect or what specific laws they obey. The law of conservation of energy, momentum, and angular momentum in physics is the most fundamental law that physical motion must obey. Compared to it, Newton's laws of motion and Maxwell's equations. , etc. are all at a lower level
Because the total energy of CaO H2O is greater than CaCO3 and the product is only CaCO3
, so heat is released
Chemical reaction,
H2O+CaO=Ca(OH) 2
No gas will be produced when pure lime reacts with water.
p>However, lime used in general building materials contains other compounds that can release gases when reacting with water, such as a small amount of C2H2< /p>