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Anonymous users2024-02-152NaCl + H2O = (electrolytic) = 2NaOH + H2 + Cl2
Energizing is one of the strongest redox means, Cl- loses electrons, H+ obtains electronic physical and chemical properties, which can be distinguished from the following three aspects:
Some properties need to be analysed on a case-by-case basis. Such as:
Some substances are insoluble in water but soluble in acid, is the "dissolution" here a physical or chemical property?
Generally speaking, soluble in water is a physical property and soluble in acid is a chemical property.
Most metals are insoluble in water, which means that under normal conditions, the quality of the solid is difficult to change when the metal is placed in water. Many metals are soluble in acids, meaning that they can react with acids to produce hydrogen and soluble salts. Similarly, limestone and marble are not soluble in water, but they can be soluble in hydrochloric acid.
Because they can react with hydrochloric acid to form a water-soluble calcium chloride and release carbon dioxide at the same time.
Physical change, chemical change: whether new matter is formed.
Chemical properties: the properties of substances that are manifested in chemical changes such as flammability, oxidation, physical properties: properties that can be directly realized without chemical changes such as color, odor, and stateExample: Determine the properties of utilization.
Rice is made into vinegar to squeeze the juice.
Activated charcoal deodorizes.
Stainless steel cookware.
Answer: Chemistry Physics Physics Physics.
Judging the change: the electric light glows, the milk is left for too long and clumps.
Water heats up and turns into water vapor.
Bicycle tires burst.
Answer: Physics Chemistry Physics Physics.
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Anonymous users2024-02-14Salt dissolves with water, physical reaction.
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Anonymous users2024-02-13You're talking about carbonates. After all, carbonic acid is relatively active and is easily decomposed into carbon dioxide and water in the displacement reaction. Example: Na2CO3+2HCl=2NaCl+CO2+H2O. Hope it helps.
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Anonymous users2024-02-12A reaction with salt and water formation is not necessarily a neutralizing reaction.
The key lies in the definition, there is a definite term for the neutralization reaction, the reaction of acid and alkali to produce salt and water, such a reaction is called neutralization reaction, there must be a premise, acid and alkali reaction!
1. Alkaline oxides react with acids to form salt and water. For example:
na2o + 2hcl === 2nacl + h2o
fe2o3 + 3h2so4 === fe2(so4)3 + 3h2o
2. Acidic oxides react with alkali to form salt and water. For example:
2naoh + so3 === na2so4 + h2o
ca(oh)2 + co2 === caco3↓ +h2o
3. The acid and salt undergo metathesis reaction to form new salts and new acids. For example:
caco3 + 2hcl === cacl2 + h2o + co2↑
4. Acid salt is decomposed by heat to form normal salt. For example:
2NaHCO3 === Na2CO3 + H2O + CO2 (condition is heating).
Ca(HCO3)2 === CaCO3 + H2O + CO2 (condition is heated).
5. Crystalline hydrate loves heat to decompose into anhydrous normal salt. For example:
Cuso4·5H2O === Cuso4 + 5H2O (condition is heating).
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Anonymous users2024-02-11Hello, I'm glad that I believe that I thought you would answer, I'm Mr. Xiaoxue, and this starts with the chemical composition of salt. The composition of salt is sodium chloride, and the composition of snow is water. Sodium chloride is the only chemical that is extremely soluble in water.
After sodium chloride is dissolved in water, it forms sodium chloride water-soluble slippery blind liquid, which contains sodium ions and chloride ions.
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Anonymous users2024-02-10Neutralization reaction: A reaction in which acids and bases interact to form salts and water.
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Anonymous users2024-02-09The general salt melts in water and does not react, forming a solution. However, the specific needs to be analyzed in detail, such as CACO3
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Anonymous users2024-02-08h2so4+ca(oh)2=caso4+h2o
Reaction with copper oxide: H2SO4 + Cuo = CuSO4 + H2O
These reactions can produce corresponding salts and waters, sulfuric acid is an acid, and acid can react with certain metal oxides or bases to form salt and water. For example, hydrated lime is used to treat the waste liquid of a sulphuric acid plant.
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Anonymous users2024-02-07Salt and water produce sodium hydroxide and hydrochloric acid.
nacl+h2o=△=naoh↓+hcl
There are many weakly alkaline substances in tea, so it is beneficial to the human body and can improve acidic constitution. These weakly alkaline substances are collectively known as theophylline, and the carbonic acid in carbonated beverages will neutralize with the alkali and destroy theophylline. In addition, carbonated drinks have many harmful effects on the human body, so carbonated drinks should be drunk less or not at all. >>>More
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