Urgent, urgent, urgent, urgent, water soluble substances react with water

Not necessarily, sodium hydroxide is a crystal, soluble in water and becomes ionic, hydrolysis reaction, you can't say it doesn't react, CO2 dissolves in water to form carbonic acid.

Alcohol dissolves in water, but it is still an ethanol molecule in water.

Are you satisfied, dissatisfied, call the police!

Not necessarily, it needs to be checked.

Organic matter generally does not react when dissolved in water, acid and alkali salts generally do not react when dissolved in water (except for water dissolution), and active metals and their oxides, peroxides, superoxides, and ozoxides are dissolved in water to form alkali (as well as hydrogen or oxygen). When acidic oxides are dissolved in water, they generally form corresponding acids, such as CO2 to carbonic acid and SO2 to sulfurous acid. There are also some redox reactions that are dissolved in water, such as NO2, Cl2, F2, etc.

Elemental substances are soluble in water except for active metals and active non-metals, and generally do not react (generally insoluble in water).

Reactive, e.g. Na2O+H2O=2NaOH

There are non-reactions, such as alcohol soluble in water, sucrose soluble in water.

Not necessarily, to give you examples.

Reactive: carbon dioxide, which dissolves in water to produce carbonic acid.

Non-reacting: Sucrose. Alcohol.

Case-by-case analysis:

CO2 is dissolved in water to form carbonic acid.

Cl2 is dissolved in water to form hypochlorous acid and hydrochloric acid.

Some reactions and some non-reactions depend on the nature of the dissolved substance. Sometimes the process of dissolving is the process of reaction.

Solubility is the property of solubility in water. Solubility is a physical property of a substance when it forms a solution. It refers to a property of the dissolution energy or hand force of a substance in a particular solvent.

Solubility refers to the maximum amount of solute that can be dissolved in a particular solvent if a solution reaches equilibrium. Under special conditions, more solute is dissolved in the solution than normal, and it becomes a supersaturated solution.

Reaction with water, is the chemical reaction of a substance with an aqueous solution, which is a chemical property. For example:

1. Active metals (sodium and before sodium) can directly react with cold water to form alkali and hydrogen.

2. The oxide of the same valence state corresponding to the soluble acid and base can be reacted with water to form the corresponding acid or base.

3. The anti-oxide can react with water to form alkali and oxygen.

The dissolution of substances in water is two processes, the process of diffusion into water absorbs heat, and the process of combining with water molecules to form hydrated molecules releases heat, if the absorbed heat is greater than the released heat, it is manifested as heat absorption, if the absorbed heat is less than the heat released, it is manifested as exothermic, if it is equal, it is manifested as neither exothermic nor endothermic Quicklime and sodium hydroxide dissolved in water all release heat, and ammonium nitrate dissolves in water to absorb heat, so the temperature of the solution decreases, and sodium chloride dissolved in water is neither exothermic nor endothermic

So the answer is: energy; Quicklime; Elevated; Ammonium nitrate; Lower; Lower; Elevated;

According to the understanding of dissolution, the dissolved substances are evenly and stably distributed.

A solution is a multi-component system in which two or more substances are homogeneously mixed and molecularly dispersed from each other. A homogeneous, stable mixture is formed. Common solutions in life include sucrose solution, iodine wine, clarified lime water, dilute hydrochloric acid, salt water, etc.

Properties of the solution:

Homogeneity: The composition and properties of the solution are exactly the same everywhere;

Stable: When the temperature is unchanged and the amount of solvent is constant, the solute and solvent will not be separated for a long time.

The essential characteristic of the solution is that the diameter of the dispersed particles is less than 1 nm, and the basic characteristics are uniformity and stability. Uniformity means that the concentration is the same everywhere in the solution; Stability means that the external conditions (temperature does not change, solvent does not evaporate) do not change, and the solute and solvent will not separate for a long time. A solution is made up of at least two substances.

1. A stable mixture in which the dispersed substance (solute) is dispersed in molecules or smaller particles in another substance (solvent).

To see if there is precipitation, there are generally these methods:

1. Almost all solid oxides are precipitated (those that can react with water are not counted!) ）

2. Except for silicic acid and boric acid, acids do not precipitate in the range of junior and senior high schools.

3. Alkalis, except for sodium hydroxide, barium hydroxide, potassium hydroxide, calcium hydroxide and other alkali metals that are soluble in eggplant branches, as well as ammonia, all others are precipitated.

4. Salts, that's complicated

In the middle and high school range, nitrate acetate is soluble.

Sulfate is only insoluble with lead sulfate and barium sulfate (there are a few slightly soluble, generally do not use the precipitation symbol).

Chloride is insoluble only silver chloride and mercurous chloride.

Carbonate and other salts are only soluble in Na, K, Ca, NH4, and nothing else except for a few such as magnesium carbonate that are slightly soluble.