"How to Write Chemical Equations Correctly" Chemical Equations PPT Courseware 7

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"How to Write Chemical Equations Correctly" Chemical Equations PPT Courseware 7

Please try to write the chemical equation of the following reaction, and then report and explain the writing process.

1. Iron burns in oxygen

2. Add manganese dioxide to the hydrogen peroxide solution

3. Sodium sulfate solution reacts with barium chloride solution to generate barium sulfate (insoluble) and sodium chloride.

4. Potassium chlorate (KClO3) and manganese dioxide (catalyst) are mixed and heated to generate potassium chloride and oxygen

Write left (short line connection) right

Chemical formula of reactants --Chemical formula of products

Trim Trim based on: law of conservation of mass

Balancing process: adding appropriate stoichiometric numbers in front of the chemical formula to make the total number of atoms of each element on the left and right sides equal

Balance methods: least common multiple method, observation method, etc.

etc. Change the dash to an equal sign

Note: Indicate reaction conditions and product status.

Check Check whether the above four items are correct

Class summary

1. Writing principles

Based on objective facts, reactions are real.

Comply with the law of conservation of mass

2. Writing steps

The writing of chemical equations can be summarized as: (Take the chemical equation writing of the reaction "potassium chlorate---potassium chloride + oxygen" as an example)

A horizontal line appears on the left and right side

Add a line after trimming

Conditions for betting on equal signs

Arrow marks gas or sediment

3. Tips for writing chemical equations

The left is reversed, the right is born, the middle is born, etc.

It is necessary to indicate whether one is angry or not

Don’t forget about conditional balancing

Class exercises:

1. Based on the knowledge you have learned, judge whether the following reaction equation is correct. If there are any errors, please point them out.

(1) 3Fe+2O2 Fe3O4

(2)Mg+O2 MgO2

(3) CH4+O2 CO2+H2O

2. Balance the following chemical equations

(1) C + CO2 = CO

(2) Al + O2 = Al2O3

(3) CuO + C = Cu + CO2

(4) C2H2 + O2= H2O + CO2

(5) H2S + O2 =S + H2O

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Update Time: 2024-09-09

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

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