Write a literal expression for the following reaction, indicating the type of reaction

Is this the text expression that the landlord said? (Reflected conditions in parentheses) 1Magnesium + oxygen = (ignited) magnesium oxide.

2.Hydrogen peroxide = (manganese dioxide and heating) hydrogen + oxygen.

3.Ammonium bicarbonate = (heated) ammonia + water + carbon dioxide.

4.Water = (electrolysis) hydrogen + oxygen.

5.Phosphorus = (ignition) phosphorus pentoxide.

The chemical formula is (the conditions are the same as above, the number after the chemical element is the foot mark) gas mark).

3.(NH4)2CO3=2NH3 (gas standard) + H2O + CO2 (gas standard) gas standard) + O2 (gas standard).

Type of reaction. The 1st, 2nd, 4th, and 5th all belong to the redox reaction, and the third belongs to the decomposition reaction.

1.Magnesium + Oxygen = (conditional ignition) Magnesium oxide, chemical reaction.

2.Hydrogen peroxide = (manganese dioxide as catalyst) water + oxygen, decomposition reaction.

3.Ammonium bicarbonate = (conditional heating) carbon dioxide + ammonia + water, decomposition reaction.

4.Water = (energized) hydrogen + oxygen, decomposition reaction.

5.Phosphorus + oxygen = (ignition) phosphorus pentoxide, chemical reaction.

All with arrows.

Problem solving ideas: According to the given reaction, analyze the reactants, products and reaction conditions, and then write the text expression of the reaction

1) The iron wire burns in oxygen and becomes ferric tetroxide, and the literal expression of the reaction: iron + oxygen.

Ignite. ferric oxide;

2) Magnesium is burned in the air to produce magnesium oxide, and the literal expression of the reaction: magnesium + oxygen.

Ignite. Magnesium oxide;

3) Potassium permanganate is thermally decomposed to produce potassium manganate, manganese dioxide and oxygen, and the literal expression of the reaction is: potassium permanganate.

Heating. Potassium manganate + manganese dioxide + oxygen

Therefore, the answer is: (1) Iron + oxygen.

Ignite. ferric oxide; (2) Magnesium + oxygen.

Ignite. Magnesium oxide; (3) Potassium permanganate.

Heating. Potassium manganate + manganese dioxide + oxygen

Comments: Test points for this question: Writing chemical equations, verbal expressions, ionization equations Comments: This question mainly examines the writing of written expressions for chemical reactions, and the key is to find out the reactants, products and reaction conditions

Problem solving ideas: firstly, find out the reactants, products, and reaction conditions according to the reaction principle, and write according to the writing methods and steps of text expressions or chemical equations; The type of reaction is then determined according to the characteristics of the reaction

1) Iron wire burns in oxygen to produce black solid ferric tetroxide, and the literal expression of the reaction is: iron + oxygen.

Ignite. Ferric tetroxide (the chemical equation of the reaction is: 3Fe+2O2

ignition Fe3O4).

2) Sulfur is burned in the air to form sulfur dioxide, and the literal expression of the reaction is: sulfur + oxygen.

Ignite. Sulfur dioxide (chemical equation: S+O2

ignite SO2).

3) Charcoal is burned in oxygen to produce carbon dioxide, and the literal expression of the reaction is: carbon + oxygen.

Ignite. Carbon dioxide (the chemical equation is: c+o2

ignite CO2).

4) Acetylene is burned in the air to produce water and carbon dioxide, and the literal expression of the reaction is: acetylene + oxygen.

Ignite. Carbon dioxide + water (chemical equation: 2C2H2+5O2

ignite 4CO2+2H2O).

1) (2) and (3) all conform to the characteristics of "multiple change one", and all belong to chemical reactions; (1), (2), (3), and (4) are all chemical reactions between substances and oxygen, and they all belong to oxidation reactions

So the answer is: (1) Iron + oxygen.

Ignite. Ferric tetroxide (the chemical equation of the reaction is: 3Fe+2O2

Ignite Reviews:

Test points for this question: Write chemical equations, verbal expressions, ionization equations; Determination of the type of reaction

Test Center Comments: This question is not very difficult, it tests the student's ability to write written expressions or chemical equations according to the reaction principle, and can correctly solve this question by mastering the writing methods of text expressions or chemistry and telling the equations

1. Hydroxide copy.

Calcium + carbon dioxide --- water attack + calcium carbonate.

2. (1) Potassium permanganate --- heated --- potassium manganate + manganese dioxide + oxygen (2) Hydrogen peroxide --- energized --- water + oxygen 3, sulfur + oxygen --- ignited --- sulfur dioxide 4, iron + oxygen --- ignited--- ferric oxide 5, red phosphorus + oxygen --- ignited--- phosphorus pentoxide 6, iron + copper sulfate--- iron sulfate + copper 7, methane + oxygen --- ignited --- water + carbon dioxide 8, magnesium + oxygen --- ignited --- magnesium oxide.

1. The combustion of magnesium belt in the air (magnesium + oxygen = ignition = magnesium oxide) 2, the burning of iron wire in oxygen (iron + oxygen = ignition = ferric oxide) 3, the combustion of charcoal in the air (carbon + oxygen = ignition = carbon dioxide) 4, the combustion of sulfur in the air (sulfur + oxygen = ignition = sulfur dioxide) 5, the combustion of red phosphorus in the air (phosphorus + oxygen = ignition = phosphorus pentoxide) above belong to the chemical reaction (1, 2, 3, 4, 5).

1.Magnesium + oxygen = (ignited) magnesium oxide.

2.Iron + Oxygen – ignition of ferric tetroxide.

3.Carbon + Oxygen – Ignites carbon dioxide.

4.Sulfur + Oxygen – Ignition of sulfur dioxide.

5.Phosphorus + oxygen – ignition phosphorus pentoxide.

The above belong to the chemical reaction of the )

Magnesium + Oxygen Combustion = Magnesium Oxide (Chemical Reaction).

Iron + Oxygen Combustion = Ferric Oxide (Chemical Reaction) Hydrogen Peroxide + Manganese Dioxide Manganese Dioxide + Water + Oxygen (Decomposition Reaction) Sulfur + Oxygen Combustion = Sulfur Dioxide (Chemical Reaction).

Potassium chlorate Potassium chloride + oxygen (decomposition reaction).

1、p+o2→p2o5

2. Mg+O2 MGO (ignition is written above the arrow step) 3. KCLO3 KCL+O2 (manganese dioxide is written above the arrow step, written below the arrow step).

For the chemical reaction, 3 is the reaction of the sub-balance hail mill Li Xie Dou.

1) 2mg + O2 = 2MGO (= ignition written above) 2NH4HCO3 NH3 (gas) CO2 (gas) H2O (gas) Among them, the gas in parentheses is replaced by an upward arrow, and a small triangle should be drawn on the equal sign to indicate heating 3) In the case of sufficient oxygen: C+O2=CO2 (Condition written on the equal sign: ignition) In the case of insufficient oxygen, carbon is not completely burned:

2c+o=2CO2 (condition is also ignition).