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Anonymous users2024-02-071 First used: find out the valency change, the number of electron transfers, find the least common multiple.
2 Just set one of them to 1 (preferably a compound with only one element on one side)3 It's really out of the question, write the letter coefficient for each chemical loss, and buy a copy of this book for the system of equations.
The first chapter is devoted to redox reactions, which is very good.
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Anonymous users2024-02-06The principle of trimming for redox reactions.
1) Principle of conservation of electrons: the total number of electrons lost by the reducing agent in the reaction is equal to the total number of electrons obtained by the oxidant.
2) Principle of conservation of charge: if it is an ionic reaction, the total number of positive and negative charges carried by ions before and after the reaction is equal.
3) Principle of conservation of mass: the number of atoms of each element before and after the reaction is equal.
Trim steps: 1) A mark: indicate the valency of the elements whose valency has changed before and after the reaction.
2) Second-class: By finding the least common multiple, the total value of valence rise and fall is equal.
3) Three determinations: determine the stoichiometric number of oxidant and reducing agent.
Stoichiometric number of oxidant (reducing agent) = least common multiple of the price reduction (liter) The total number of oxidant (reducing agent) price reductions (liters) in 1mol.
4) Siping: Balance the stoichiometric numbers of other substances by observation method.
5) Five checks: check whether the mass is conserved with charge and electrons respectively.
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Anonymous users2024-02-05ag3aso4+zn+h2so4---ag+znso4+ash3+h2o
The best way to do this is to:
Let the ag3aso4 coefficient be 1, then ag is 3, ash3 is 1, so if water is not considered, h2so4 is, znso4 is, zn is, the excess oxygen atom is 4, and an additional 8 HYDROGEN IS NEEDED, SO ADD 4 H2SO4, 4 ZN, 4 ZNSO4
It is divided into integers, namely: 2AG3ASO4+11ZN+11H2SO4 - 6AG+11ZNSO4+2ASH3+8H2O
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Anonymous users2024-02-04The trimming of all redox reactions can be considered according to the characteristics and nature of redox: the total number of valence rises and falls is equal, and the total number of electron gains and losses is equal.
Steps: Mark the price, change the column, rise and fall, etc., and observe the flat.
Therefore, the key to the timing of the match is to correctly mark the valency of the elements, and it is easier to use some trimming techniques. ag3
aso4zn+h2so
4---ag+znso
4+ash3+h
2o.Middle. It can be seen that it is AG that has a decrease in valency
In 3ASO4, the reduced valency of AG and AS in the whole substance is =3*(+1-0)+1*[+5-(-3)]=11, the valency of the whole substance is increased by Zn, and the increase of the valence of the whole substance is =2.
Lifting, etc.: ag
The coefficient of 3ASO4 is 2 and the coefficient of ZN is 11.
The rest are balanced according to the conservation of mass, the conservation of charge (ionic reaction).
For: 2ag3aso
4+11zn+11h2so
4=6ag+11znso
4+2ash
3+8h2o
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Anonymous users2024-02-03To be honest, what I generally see is common, and those coefficients have long been remembered, so it won't be as difficult as the trimming of the redox topic, I usually answer the questions online, I don't bother to calculate, I often use the ** chemical reaction trimming software above, this is very good, if there are some too difficult, it can't be made by using conventional methods, you can also use this ......
The method of trimming <> redox reaction consists of the following steps:1Determine the oxidation states of all elements in the reactants and products and list them to the left and right of the reaction equation. >>>More
What you're talking about is a redox reaction. As long as the valency of any element in the reactant rises and falls. It can be two liters and one down; It can also be two drops and one liter; It can also be an element that rises and falls, i.e., disproportionation and centering. Here is the definition of redox reaction: >>>More
Example 1] Analyze the transfer of electrons and the rise and fall of valence in the following redox reactions, which substance is an oxidant and which substance is a reducing agent? (1) Zn+H2SO4===ZNSO4+H2 (2)Fe+2HCl===FeCl2+H2 Analysis: According to the relationship between electron transfer and valence rise and fall in redox reactions, and the definition of oxidants and reducing agentsAnswer: >>>More
In this reaction, there is only the electron gain and loss of nitrogen element, the valency has risen and decreased, so C is wrong, the increase of nitrogen in metadimethylhydrazine is oxidized, it is a reducing agent, so a is wrong, the reaction is the recombination of atoms, so there is an endothermic and exothermic process, C is wrong, D is left, of course, there are eight electrons transferred from two N2O4 to N2 D is correct.
1. The basic concept of redox reaction:
Oxidation and reduction reactions: oxidation reactions are characterized by an increase in the valency of an oxidized element, which is essentially a process in which the atoms of the element lose electrons (or deviate from the common electron pairs); The reduction reaction is characterized by a decrease in the valency of the reduced element, which is essentially the process by which the atoms of the element gain electrons (or share electron pair bias). >>>More