"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT (Lesson 1)

"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT (Lesson 1)
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"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT (Lesson 1)

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"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT (Lesson 1), 21 pages in total.

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1. The meaning of chemical equations

(1) Qualitative aspect: Indicates reactants, products, and reaction conditions.

(2) Quantity aspect

① Macro: represents the mass ratio of each substance (the ratio of the product of the chemical formula of each substance and its stoichiometric number).

②Microscopic: Indicates the ratio of the number of particles of each substance (numerically equal to the ratio of stoichiometric numbers).

Note: It does not mean that the name of the substance in the text expression is replaced by a chemical formula to form a chemical equation. The chemical equation must follow the law of conservation of mass.

Under the same conditions, the volume ratio between gaseous reactants or products is equal to the ratio of the stoichiometric numbers of the corresponding substances in the chemical equation.

Key points of new knowledge

1. Chemical equations are expressed in terms of ____________________.

2. The meanings expressed by chemical equations are:

(1) Indicates _______________, _______________ and _______________;

(2) Expresses the ____________________ relationship between reactants and products, that is, the ____________________ between substances;

(3) Indicates the ____________________ relationship between the microscopic particles of each substance in the reaction system.

Knowledge points: The meaning and reading of chemical equations

3. The meaning of "===" in chemical equations includes ()

①The elements of the reactants and products are the same; ②The sum of the masses of the reactants and products is equal;

③The types of atoms in the reactants and products are the same; ④The number of atoms in the reactants and products are equal;

⑤The number of molecules in the reactants and products is equal; ⑥The volumes of reactants and products are the same;

⑦The meaning of "generate".

A. ①③⑤⑦ B. ②④⑥⑦

C. ①②③④⑦ D. ②⑦

Pass the basics

1. The information that cannot be obtained from the following two chemical equations is ()

Reaction ①: 2H2O2=====MnO22H2O+O2↑

Reaction ②: 2KMnO4=====△K2MnO4+MnO2+O2↑

A. Both reaction ① and reaction ② generate gas.

B. Reaction ① and reaction ② are carried out under different conditions

C. Both reaction ① and reaction ② release heat

D. Both the reactants of reaction ① and reaction ② contain oxygen element

2. Among the following meanings expressed by the chemical equation S+O2===== igniting SO2, the incorrect statement is ()

A. Under ignition conditions, sulfur reacts with oxygen to form sulfur dioxide

B. Sulfur reacts with oxygen to form sulfur dioxide

C. Every 32 parts by mass of sulfur and 32 parts by mass of oxygen react completely to produce 64 parts by mass of sulfur dioxide.

D. Under ignition conditions, each sulfur atom combines with an oxygen molecule to form a sulfur dioxide molecule

Keywords: Free download of Chemistry PPT courseware for the first volume of the ninth grade of the Lujiao Education Edition, PPT download of the representation of chemical reactions, PPT download of quantitative research on chemical reactions, .PPT format;

For more information about the "Quantitative Study of Chemical Reactions Representation of Chemical Reactions" PPT courseware, please click the Quantitative Study of Chemical Reactions PPT Representation of Chemical Reactions PPT tab.

"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT:

"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT, 24 pages in total. Learning Objectives 1. Understand chemical equations. 2. Know the principles followed by chemical equations. 3. Understand the meaning of chemical equations. ... ... ... Explore new knowledge on the conditions under which water is energized..

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

"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT (Lesson 2), 22 pages in total. Famous teacher’s eye-catching 1. Principles for writing chemical equations (1) Based on objective facts. (2) Follow the law of conservation of mass to keep the type and number of atoms consistent before and after the reaction.

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Update Time: 2024-07-10

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