| Category | Format | Size |
|---|---|---|
| Lu Jiao Edition Ninth Grade Chemistry Volume 1 | pptx | 6 MB |
"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT
Description
"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT, 24 pages in total.
learning target
1. Understand chemical equations.
2. Know the principles followed by chemical equations.
3. Understand the meaning of chemical equations.
Explore new knowledge
The reaction "water decomposes under the condition of electricity" can be expressed in the following way.
chemical equation
Definition: A chemical formula is used to represent a chemical reaction.
Principles followed by chemical equations
1. Based on scientific experimental facts, substances and chemical reactions that do not exist in fact cannot be invented out of thin air.
2. Based on the law of conservation of mass, the types and numbers of various atoms on both sides of the equal sign must be equal.
Independent learning: 1. Chemical equations and their significance
Study guide: Please read pages 106 to 107 of the textbook carefully for 2 minutes, and answer the following questions.
1. What does “△” represent in chemical equations? Can it mean "ignite"?
2. In the chemical equation, where is the mark "↑" or "↓"? What do they mean?
3. What information can chemical equations tell us, that is, what is the significance of chemical equations?
summary
1. Chemical equation
1. Definition
2. Follow the principles
⑴Follow objective facts ⑵Follow the law of conservation of mass
3. Meaning
⑴ Indicates the reactants, products and reaction conditions. (macro)
⑵Represents the ratio of the number of microscopic particles of reactants and products (microscopic)
⑶ Indicates the mass relationship between reactants and products, that is, the mass ratio between substances. (quality)
practice
1. Rockets use hydrazine (N2H4) as fuel and nitric oxide as oxidizer. The chemical equation of the reaction is: N2H4+2NO == 2X+2H2O. Find the chemical formula of X ( )
A. N2 B. NO2 C. NH3D. N2O
2. A certain substance can undergo the following reaction: 2 + 2H2O ==4KOH + O2↑, then the substance in should be ( )
A. KO B. K2O C． K2O2 D. KO2
Keywords: Free download of PPT courseware for the eighth grade of Chemistry in the May 4th System of Lujiao 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 (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.
"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT (Lesson 1):
"Representation of Chemical Reactions" Quantitative Study of Chemical Reactions PPT (Lesson 1), 21 pages in total. Famous teacher’s eye-catching 1. The significance of chemical equations (1) Qualitative aspect: indicates the reactants, products, and reaction conditions. (2) Quantitative aspect ① Macroscopic: Indicates the quality of each substance..
File Info
Update Time: 2024-06-29
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