"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT (Lesson 2)

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"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT (Lesson 2), 22 pages in total.

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1. Principles of writing chemical equations

(1) Based on objective facts.

(2) Follow the law of conservation of mass to keep the type and number of atoms unchanged before and after the reaction.

2. Steps to Write a Chemical Equation

One write, two match, three note, four check.

(1) Write: Based on objective facts, write the chemical formula of the reactants on the left and the chemical formula of the product on the right. Connect the reactants and products with a short line. When there is more than one reactant or product, use "+" No. connection.

(2) Balance: Balance the chemical equation. According to the law of conservation of mass, appropriate stoichiometric numbers are placed in front of each chemical formula so that the types and numbers of atoms on the left and right sides are equal.

Note: ① When balancing, you can only add the appropriate stoichiometric number before the chemical formula, and the chemical formula must not be changed.

②The ratio of the stoichiometric numbers in front of the chemical formula should be the simplest integer ratio.

③ For chemical equations with roots participating in the reaction, if the roots do not change before and after the reaction, the roots can be considered as a whole for balancing.

Key points of new knowledge

1. Principles that should be followed when writing chemical equations: First, it must be based on _______________ and cannot make up _______________ and _______________ that do not actually exist out of thin air; Second, it must follow _______________, so that the _______________ of each atom before and after the reaction must be constant.

2. Steps to write chemical equations:

(1) Write: Based on objective facts, write the chemical formula of ____________________ on the left and the chemical formula of ____________________ on the right, connecting with ____________________ in the middle.

(2) Balance: Balance the chemical equation by adding the appropriate __________________ in front of the chemical formula so that each element __________________ on both sides of the formula is equal.

(3) Note: Indicate the ____________________ where the chemical reaction occurs, mark ____________________ with an arrow, and change the short line to ____________________.

(4) Check: Check whether the chemical formula is written correctly, whether the chemical equation is balanced, whether the reaction conditions and the status of the product are marked accurately and appropriately.

Pass the basics

1. Which of the following chemical equations is incorrectly written ()

A. HgO======△Hg＋O2↑

B. 3Fe+2O2====== Ignite Fe3O4

C． 2H2O2=====MnO22H2O＋O2↑

D． 2KMnO4======△K2MnO4＋MnO2＋O2↑

2. (Gansu Jinchang High School Entrance Examination) The earliest rechargeable battery used was lead-acid battery. It is known that the chemical equation of the reaction when charging the electric vehicle lead-acid battery is 2PbSO4+2H2O===Pb+PbO2+2X, then the chemical formula of X is ()

A. SO2 B. SO3

C． H2SO3 D. H2SO4

3． Using sodium ferrate (Na2FeO4) to disinfect river water is a new technology for urban drinking water treatment. It is known that the reaction to obtain sodium ferrate is Fe2O3+mNa2O2===nNa2FeO4+Na2O, where the values ​​of m and n are () respectively

A. 2 3 B. 3 2

C． 1 3 D. 3 1

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Update Time: 2024-07-04

This template belongs to Chemistry courseware Lu Jiao Edition Ninth Grade Chemistry Volume 1 industry PPT template

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