Can high school chemical ions react, and how to judge what is generated by reaction?

I went to the Internet and summed it up as follows: "Look at whether the charge is conserved: In the ion equation, the number of charges and the number of atoms on both sides must be conserved.

If FeCl3 solution reacts with Cl2, it should not be written as Fe3 +Cl2 = Fe2 +2 Cl, but should be written as 2Fe3 +Cl2 = 2Fe3 +2 Cl.

Second, see whether the split is appropriate: in the ionic equation, strong acids, strong bases and salts that are easily soluble in water are split into ionic form; Insoluble substances, refractory ionization substances, volatile substances, elemental substances, oxides, non-electrolytes, etc. cannot be separated, and should be written as chemical formulas. For example, HCO3 cannot be written as CO32 +H, and HSO4 should usually be written as SO42 +H; Na2O should be written as na2o, not na + o2, etc.

Three to see if the ion reaction is missed: for example, the reaction of Ba(OH)2 solution with CuSO4 solution should be written, and the ion reaction of Ba2 +SO42 should be written, which should be BA2 +2OH +Cu2 +SO42 = BaSO4 +Cu(OH)2.

Fourth, look at whether it conforms to objective facts: the reactants and products of ionic reaction must be consistent with objective facts, and cannot be based on subjective imagination and make up some substances by themselves, such as Febr2 solution can not be written as Fe2 +Cl2 = Fe3 +2Cl, it is inconsistent with objective facts, should be written as 2Fe2 +4BR +3Cl2 = Fe3 +6Cl +2BR2.

Fifth, see whether the ratio of reactants or products is reasonable: for example, the reaction between dilute H2SO4 and Ba(OH)2 solution cannot be written as H + OH +SO42 +BA2 = BASO4 +H2O, but should be written as 2H +2OH +BA2 +SO42 = BASO4 +2H2O.

Sixth, look at whether "meet the conditions of the question": the conditions of the question often have words such as "excessive", "a small amount", "appropriate amount", "arbitrary amount", "dropping order", etc., and special attention should be paid when solving the problem. If the sodium bicarbonate solution reacts with a small amount of lime water, it cannot be written as HCO3 +Ca2 +OH = CaCO3 +H2O, it should be written as CA2 +2HCO3 +2OH = CAC3 +H2O.

Seventh, see whether the various symbols are correct: such as " " and the ion symbol is written as a valence symbol, etc. If the hydrolysis of Na2CO3 cannot be written as CO32 + H2O = HCO3 +OH, it should be written as CO32 +H2O HCO3 +H2O.

These seven points are found on a post bar I personally think it is feasible You can read it carefully There is also more to do more questions and accumulate more to memorize its reactions.

Isn't the ionic equation typical?

As for what is generated, the ion equation is based on redox reactions, the valence of which rises and falls, and the final product is stable.

It's nothing more than the gain and loss of electrons.

See if the ion combination can produce gases, insoluble electrolytes, and weak electrolytes.

1.See if you can generate water, gas, and precipitation.

2.See if the redox reaction can occur.

1. Reactions with ion participation or generation are ionic reactions.

2. The ion reaction is generally carried out in aqueous solution or in the melted state.

3. The galvanic cell reaction and the electrolytic cell reaction are all ionic reactions.

4. The metathesis reaction belongs to the galvanic cell reaction.

5. Some redox reactions carried out in solution are also ionic reactions, such as the reaction of iron and copper sulfate solution.

6. The reactions between gases and gases, solids and gases, solids and solids are not ionic reactions!

I think that in the second option D, if the two Hengliang solutions are 1mol L, then the NaHSO4 solution only has 1mol L of H, and the Ba(OH)2 solution with the same concentration of filial piety has 2mol L of hydroxide ions, but there are 2mol L of hydrogen ions in the reaction equation, and the amount used is incorrect.

Option A of the first sheet, assuming that a reaction occurs, and you add chloride ions, you can see that the first is that the weak acid reaction becomes a strong acid, which is not theoretically true, so it does not react.

The third refers to Lao Tongzhang is a two-step Weitan: 2OH- +SO2 = SO2- 3 + H2O

so2- 3 + so2 + h2o = 2hso-3

Child, I'll help you straighten him out one by one. Take your time and don't rush.

Electrolytes] Electrolytes are chemical compounds that are dissolved in aqueous solution or in the molten state to conduct electricity and produce chemical changes.

Q: How can you tell the difference between strength and weakness? Why are they strong and others weak?

A: The strength of electrolytes is determined by their chemical bonds. Generally speaking, strong acids, strong bases, and ionic compounds are strong electrolytes. Weak electrolytes are generally difficult to ionize, such as some organic acids - acetic acid.

Writing of equations].

Q: How do you know what the product is?

A: The first is guessing. After doing more, just rely on intuition, and try it a hundred times. The second is to disassemble the molecular clusters and recombine them according to the properties of the reactants. It's dumber, but it's more effective for beginners. It's the dumbest way to do it.

Problems of oxidation and reduction].

Q: How do I know what sex is!

A: This is a law of chemistry. The more ** the substance, the more oxidizing, and the more expensive the substance, the more reducible.

For example, sulfur has many valence states: +6, +4, +2, 0, -2, -3 (it seems to be) the more **, the more oxidizing it is. The sulfur element in sulfuric acid is +6 valence, and we also know that sulfuric acid has oxidizing properties, which is actually given by the +6 valence sulfur element.

Covalent and non-covalent].

It's actually quite simple. Most of the non-metallic atoms are bonded together in a covalent bond manner. If you put it in layman's terms, it's easy to understand.

And then there's a lot more to add, and if you want to ask, just ask for it.

You should read the textbook well, make a relevant summary for each chapter (don't read the book when summarizing), and do some related topics.

This is something to learn, don't resist, after learning you will find that it is actually very good! There are only a few common valencies.

Strong electrolytes: Refers to compounds that are completely ionized into ions in water Most salts and strong acids and bases (H2SO4, HNO3, HCl, Naoh Koh, etc.) are strong electrolytes.

Weak electrolytes refer to compounds that are incompletely ionized in water and partially ionized, weak acids, weak bases (HF, CH3, COOH, Fe(OH)3, Cu(OH)2, etc.), individual salts (HgCl2, Hgbr2, HG(CN)2, PT(NH3)2Cl2, CDI2, etc.).

Compounds: Compounds formed mainly by covalent bonding, called covalent compounds. Compounds (such as CO2, ClO2, B2H6, BF3, NCL3, etc.) and most organic compounds formed by the atomic combination of different non-metallic elements are covalent compounds.

A compound made up of cations and anions. When active metals (such as sodium, potassium, calcium, magnesium, etc.) and active nonmetals (such as fluorine, chlorine, oxygen, sulfur, etc.) are combined with each other, the active metals lose electrons to form positively charged cations (such as Na+, K+, Ca2+, Mg2+, etc.), and active nonmetals obtain electrons to form negatively charged anions (such as F-, Cl-, O2-, S2-, etc.), and cations and anions form ionic compounds by electrostatic action.

A reaction in which there are ions participating or ions forming in the reaction is called an ionic reaction. In the secondary school stage, reactions are limited to being carried out in solution. It can be said that ionic reaction refers to a class of reactions in which electrolytes are involved in aqueous solution. None of the reactions between organic matter are ionic reactions.

What can be ionized is an ionic reaction, like the reduction of copper oxide by carbon monoxide is not an ionic reaction.