Single line bridge representation of chemical equations

Representation method – two-line bridge method.

Indicates the electron transfer between atoms of the same element before and after the reaction.

1.The basic steps of the two-line bridge method.

1) Valence state: Correctly mark the oxidation reaction.

The valency of the same element before and after.

Judge its rise and fall.

2) Connecting double lines: one line is directed by the element with reduced valency in the oxidant to the corresponding element in the reduction product, and the other line is directed by the reducing agent.

The elements with elevated valency point to the corresponding elements in the oxidation products.

3) Note gains and losses: marked"Lost"or"Get"The total number of electrons, indicating the element"is oxidized"or"is restored"

2.Precautions.

1) The arrow, the tail of the arrow points to the same element of the valence change.

2) Must be indicated"Get"or"Lost"Words.

3) The total number of electrons lost by the reducing agent and the total number of electrons obtained by the oxidant are equal.

This paragraph. Representation method – single-line bridge method.

Indicates the electron transfer between atoms of different elements before and after the reaction.

1.The basic steps of the one-line bridge method.

1) Valence state: correctly mark the valency of the same element before and after the oxidation reaction, judge its rise and fall, and then determine the element of electron gain and loss.

2) Connect a single line: connect the oxidant and reducing agent on the left side of the equation, and the arrow points to the oxidant.

3) Note gain and loss: mark the total number of transferred electrons.

2.Precautions.

1) No need to specify"Yes"or"lost"

2) The arrow indicates the direction of electron transfer.

This paragraph. Trim method – conservation of electrons.

Single-line bridge method: clearly indicate the valence.

Summary. 2kmNO4 = heating = 2mNO2 + O2 (gas) + K2O2 Ca(OH)2 + 2HCl = ==CaCl2 + 2H2O

Cu + 2Hno3 === Cu (NO3) 2 + H2 (gas).

2NaHCO3 = Heating = Na2CO3 + H2O + CO2 (gas).

2fecl3+cu===2fecl2+cucl2

Cl2+2KOH=KCl+KCLO+H2O Chlorine is zero-valent, potassium is positive, and oxygen is negative. The chloride ions in chlorine gas are zero-valent, and in the substances generated, the valence state of chloride ions is only neutralized and does not intersect, so the chloride ions in potassium chloride are negative monovalent, and the chloride ions in potassium hypochloride are positive monovalent, and chlorine gas transfers 1mol electrons to potassium chloride and 1mol electrons to potassium hypochloride.

The two-wire bridge method represents 40 chemical equations 50 pcs.

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2kmNO4 = heating = 2mNO2 + O2 (gas) + K2O2 Ca(OH)2 + 2HCl = ==CaCl2 + 2H2O

Cu + 2Hno3 === Cu (NO3) 2 + H2 (gas).

2NaHCO3 = Heating = Na2CO3 + H2O + CO2 (gas).

2fecl3+cu===2fecl2+cucl2

Cl2+2koh=KCL+KCLO+H2O Chlorine is zero-valent, potassium ions are positive and silver jujube valence, and oxygen ions are negative bivalent. The chloride ions in the chlorine gas are zero-front valence, and in the generated substance, the valence state of the chloride ions is only neutralized and does not intersect, so the chloride ions in potassium chloride are negative monovalent, and the chlorine ions in potassium hypochloride refer to the non-ions are positive monovalent, and the chlorine gas transfers 1mol electrons to potassium chloride and 1mol electrons to potassium hypochloride.

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The chemical singleline bridging method is written as follows:

Writing: There are substances on the left and right of the equal sign or arrow symbol of the chemical equation; In reactants, there are substances that lose electrons and become products, and substances that gain electrons and become products, that is, there are elements in the reactants that gain and lose, and from the elements that lose electrons point to the elements that gain electrons.

The mantra is: the valency increases and loses electrons. The valency decreases to obtain electrons, depending on how much the valency of the reactant rises or falls, multiply by the number of atoms and then multiply the previous reaction coefficient, which is the number of electrons transferred, and the arrow direction points to the element of the electron, and the number of electrons transferred is marked with a large number.

Introduction: The single-line bridging method is a method that uses arrows and words or symbols to represent the electron gain and loss of various elemental particles in a chemical reaction. It is used to denote the essence of a redox reaction.

In an equation, the total number of electrons gained and lost is equal, and above the arrow is written the amount of electrons gained and lost by a single atom multiplied by the coefficients.

A single-wire bridge is a chemical equation in which electrons are transferred, which is more difficult than a two-wire bridge, such as sodium peroxide, which reacts with rolling water to produce oxygen, and sodium peroxide is a self-transferring electron that can be bridged with a single wire.

Note: Double-line bridging method and single-line bridging method For the sake of specification, it is best not to use the single-line bridging method for self-redox reactions, because the labeling will make the electron fate in the reaction unclear, so it is best to use the two-wire bridging method to represent electron transfer in the self-redox reaction equation macro-combustion.

1. In the redox reaction in the chemical companion wheel, there is electron transfer (gain, loss or offset), that is, there is a gain, loss or shift of elemental electrons in the reaction, and then a broken line with an arrow is used to point to the element that obtains electrons from the element cavity that has lost electrons, and the number of transferred electrons is marked on the "bridge", which is called single-line bridge method.

2. The single-line bridge method represents the electron transfer between the same element or different elements in the reactant, that is, the direction and number of electron transfer.