"How to Write Chemical Equations Correctly" Chemical Equations PPT Courseware 9

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"How to Write Chemical Equations Correctly" Chemical Equations PPT Courseware 9

Observation: The chemical change describing the burning of iron in oxygen takes three forms. Please think about it, which one describes this chemical change in the simplest, scientific and convenient way?

①Language expression: Iron burns in oxygen to form ferric oxide.

②Literal expression: iron + oxygen → ferric oxide

③Chemical equation: 3Fe+2O2 = Fe3O4

Do you think it is (fill in the serial number)

Discussion and analysis: Is the following chemical equation for "aluminum burning in oxygen to form aluminum oxide" correct? If not, tell us your reasons.

①Al +O2 = H2O

②Al2O3 = Al+O2 ↑

③Al+O2 = Al2O3

How to write chemical equations correctly?

1. Writing principles

Based on objective facts

Follow the law of conservation of mass

It must be based on objective facts and must not invent substances and chemical reactions that do not exist out of thin air.

It must comply with the law of conservation of mass, and the types and numbers of atoms on both sides of the equal sign must be equal.

2. Writing steps

Write Write the chemical formulas of the reactants and products and connect them with dashes or arrows.

Balancing chemical equations, least common multiple method

Note: Indicate the reaction conditions and the state of the product.

etc. Change the dash or arrow to an equal sign

Try it, can you balance the following chemical equation?

(1)C + CO2 = CO

(2)Al + O2= Al2O3

(3) CuO + C = Cu + CO2

(4) CH4 + O2 = CO2 + H2O

(5) H2S + O2= S +H2O

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Update Time: 2024-11-17

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

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