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"Classification and Transformation of Matter" PPT courseware
Part One: Learning Objectives
1. Understand the meaning of classification and classification methods.
2. Understand the application of classification methods in chemistry, and practice classifying the chemical substances and chemical reactions you have learned.
3. Understand the meaning of dispersion system, and understand the important properties, applications and identification methods of colloids.
4. Understand the transformation relationship of substances.
5. Consolidate the types of chemical reactions learned in junior high school and establish a knowledge system about chemical reactions.
Classification and changes of substances PPT, part 2 content: 1. Classification of substances
Connect with practice. Talk about examples of applying classification methods in daily life, and discuss the significance of classifying them? What is the significance in chemistry?
The significance of classification in life: it can improve the efficiency of people's work and study, and enable people to achieve their goals faster and more conveniently.
The significance of classification in chemistry: Classification is a common scientific method for learning and studying chemical substances and their changes. There are many types of substances, and classification can be used to group many substances with common characteristics into one category, to avoid repeated research, and to gain a deeper understanding of the intrinsic differences and connections of substances.
1. For chemical substances, how can they be classified according to the number of types of substances they contain?
2. What classification results can be produced by classifying compounds according to different classification standards?
1. Cross classification.
A classification method that classifies ________ in many ways according to the classification criteria of ________. For example:
Na2CO3
Classified according to the cations it consists of, it belongs to sodium salt
Classified according to the anions in their composition, they belong to carbonate
Classified according to their solubility into soluble salts
2. Classification of chemical substances
(1) Cross classification method.
①Cross classification of salt:
Na2CO3
Na2SO4
BaCO3
BaSO4
(2) Tree classification method:
A method of further classifying similar things according to attributes, grading, and progression, with one classification standard for each level.
What is the difference between cross classification and tree classification?
(1) There is a cross-relationship between categories in the cross-classification method; for example, Na2SO4 and K2SO4 belong to sodium salts and potassium salts respectively, but they all belong to sulfates.
(2) There is a subordinate relationship between the substance categories in the tree classification method; for example, salts belong to compounds, and compounds belong to pure substances.
Cross classification: It is a method of classifying the same thing according to multiple standards. It can provide a more comprehensive understanding of things and can make up for the shortcomings of a single classification method.
Tree classification: It is a method of further classifying similar things according to their attributes. It can understand things more deeply and promote scientific development.
Classification and changes of substances PPT, part three content: 2. Colloids
Does anyone still remember the concept of "solution" learned in junior high school?
One or several substances are dispersed into another substance to form a uniform and stable mixture, which is called a solution.
Solvent: A substance that can dissolve other substances.
solute: substance that is dissolved
A system obtained by dispersing one (or more) substance in another (or more) substance: dispersion system
Dispersed substance: dispersoid
Plays the role of accommodating dispersions: dispersant
Dispersion systems and their classification
1. Concepts related to dispersion system, dispersoid and dispersant
Dispersion system: A system obtained by dispersing one (or more) substance in another (or more) substance.
Dispersoid: The substance that is dispersed.
Dispersant: plays the role of holding the dispersion.
Classification and changes of substances PPT, part 4 content: 3. Transformation of substances
The following common substances in the laboratory, with which substances they can react, write the equation of the reaction. And summarize the rules of the reaction.
Fe, O2, C, CO2, CaO, NaOH solution, H2SO4, CuSO4 solution, Na2CO3 solution
properties of salt
1. React with metals to form metals and salts
2. React with certain acids to form new salts and acids
3. React with certain bases to form new salts and bases
4. React with certain salts to generate two new salts
5. Conversion of normal salt and acid salt
How would you classify the following chemical reactions?
(1) Sulfur burns in oxygen
(2) Red phosphorus burns in oxygen
(3) Iron wire burns in oxygen
(4) Aluminum foil burns in oxygen
Three standards:
①Is it a chemical reaction?
②According to the characteristics of the reactants
③Is it an oxidation reaction?
Keywords: PPT courseware for high school chemistry compulsory course 1 from the People's Education Press is available for free download, Classification and Transformation of Substances PPT download, .PPT format;
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