"Chemical Equations" Source of Life - Water PPT Courseware 3

Description

"Chemical Equations" Source of Life - Water PPT Courseware 3

Review questions

What is the law of conservation of mass?

In a chemical reaction, the sum of the masses of the substances participating in the reaction is equal to the sum of the masses of the substances produced by the reaction.

1. What is a chemical equation?

For example: C+O2=CO2

Definition: The formula that uses a chemical formula to express a chemical reaction is called a chemical equation, also called a reaction equation, or simply a reaction formula.

The substances participating in the reaction are called reactants;

The substances produced after chemical reactions are called products.

The meaning of chemical equations

(1) Understand from a qualitative perspective, indicating the reactants, products and reaction conditions.

For example, the reaction listed above means that the reactants are carbon and oxygen, the product is carbon dioxide, and the reaction conditions are "ignition".

(2) Understand from a quantitative perspective and express the mass relationship of each substance. (The mass ratio of each substance is equal to the ratio of the sum of the relative molecular masses of each substance)

For example, the reaction listed above means that every 12 parts of carbon by mass reacts with 32 parts by mass of oxygen to produce 44 parts by mass of carbon dioxide, which is consistent with the law of conservation of mass.

2. How to write chemical equations

1. Two principles for writing chemical equations

Based on the facts of scientific experiments, write the chemical formulas of the reactants and products

Based on the law of conservation of mass, the type and number of atoms on both sides of the equal sign must be the same

Write

Left (short wire connection) Right

chemical formula of reactants chemical formula of products

match

Trim based on law of conservation of mass

Balancing process: adding appropriate stoichiometric numbers in front of the molecular formula so that the total number of atoms of each element on the left and right sides is equal

Balancing methods: least common multiple method, observation method, odd couple method, etc.

2. Writing steps

Write Write the chemical formulas of the reactants and products

Label Indicate the reaction conditions and the state of the product.

Balancing a chemical equation

Class exercises

1. Aluminum + oxygen → alumina

4Al+3O2==2Al2O3

2. Methane + oxygen → water + carbon dioxide

CH4+2O2 ==CO2+2H2O

3. Potassium permanganate (KMnO4) → Potassium manganate (K2MnO4) + manganese dioxide + oxygen

2KMnO4==K2MnO4+MnO2+O2

Class Exercise 2

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) Al + O2==Al2O3

(2) CuO + C==Cu + CO2

(3)C2H2 + O2==H2O + CO2

(4) H2S + O2==S + H2O

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Update Time: 2024-10-19

This template belongs to Chemistry courseware Cantonese Education Edition Ninth Grade Chemistry Volume 1 industry PPT template

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