"Formation of Solution" Solution PPT Courseware 2

Description

"Formation of Solution" Solution PPT Courseware 2

1. The status and role of teaching materials:

Solution is a state of coexistence of substances, and it is a type of dispersed system encountered in middle school chemistry. In the next unit, we will learn about common acids and bases. The chemical reactions between them are almost always carried out in solutions. To learn these contents well, it is necessary for students to systematically master the relevant knowledge of solutions. Therefore, this unit The teaching also provides knowledge preparation for the next unit of study.

This topic is preliminary knowledge about solutions. The first part is mainly to enable students to understand the characteristics of solutions from a macro perspective, and to understand from a micro perspective that a solution is a uniform system formed by dispersing solute into a solvent in the form of molecules or ions. On this basis, students can establish a more scientific concept about solutions, and then understand the solute, solvent and dialectical relationship. Finally, the emulsification phenomenon was briefly introduced through experiments to stimulate students' interest in learning chemistry.

2. Teaching objectives:

1. Knowledge goals:

(1) Understand the basic concepts of solute, solvent and solution.

(2) Understand that the basic characteristics of solutions are uniformity and stability.

(3) Understand the application of solutions in industrial and agricultural production and life.

2. Ability goals:

Learn methods of scientific inquiry and scientific experiments, and practice thinking skills of observation, recording, analysis and problem solving.

3. Emotional goals:

Cultivate students' cooperative spirit and scientific attitude of seeking truth from facts.

3. Teaching Focus and Difficulties

Key Points 1. Establish the concept of solution.

2. Understand the three concepts of solution, solute and solvent

Difficulties 1. Understand the solution from a microscopic perspective.

2. Understand the dialectical relationship between solute and solvent.

Characteristics and composition of solution:

(1) Characteristics: Uniform and stable.

Homogeneous: means that the composition and properties of any part of the solution are exactly the same.

Stable: means that when the external conditions remain unchanged (temperature, solvent volume, gas, pressure, etc.), the solute will not separate from the solvent.

(2) Composition: It consists of two parts: solute and solvent.

Solute: A substance that is dissolved.

Solvent: A substance that dissolves other substances. Water is the most common solvent.

Solution mass = solute mass + solvent mass

summary:

1. Know the concepts of solution, solute and solvent

Know about emulsions and emulsification phenomena.

2. During the process of dissolution of substances, some absorb heat and some release heat.

Feedback Correction:

(1) What are the characteristics of the solution? Can you give an example?

(2) Is the solution necessarily colorless and transparent?

(3) Is a uniform and stable liquid necessarily a solution? (example)

(4) What are the solutes and solvents in iodine?

(5) After mixing sucrose solution and NaCl solution, is it still a solution? What is the solute?

Exercise 1: Judgment Explanation

1. The solution is colorless.

2. A colorless and transparent liquid is a solution.

3. After pouring out half of the salt solution, it becomes dilute.

4. Under the condition that the temperature remains unchanged and the water does not evaporate, the sucrose in the sucrose solution will separate from the water.

Exercise 2

1. Find the solute and solvent in the following solutions

(1) Calcium chloride solution

(2) Solution after reaction of calcium carbonate and hydrochloric acid

(3) Solution formed by 95mL alcohol and 5mL water

2. Can be used as a solute ( )

A. Only solids B. Only liquids

C. Only gases D. Gases, liquids, and solids can all be used

3. Add a small amount of substances into water and stir thoroughly to obtain a solution ( )

A. Sediment B. Alcohol C. Gasoline D. Sucrose

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"Formation of Solution" Solution PPT Courseware 5:

"Formation of Solution" Solution PPT Courseware 5 Teaching Objectives Knowledge and Skills 1. Understand the phenomenon of dissolution, know the concepts of solution, solvent, solute, etc., know that water is an important solvent, and alcohol, gasoline, etc. are also common solvents; 2. Know some common emulsification phenomena; 3..

"Formation of Solution" Solution PPT Courseware 4:

"Formation of Solution" Solution PPT Courseware 4 1. Solution 1. Definition: One or several substances are dispersed into another substance to form a uniform and stable mixture, which is called solution. 2. Characteristics: Uniformity, stability Uniformity: refers to the composition and...

"Formation of Solution" Solution PPT Courseware 3:

"Formation of Solution" Solution PPT Courseware 3 Students think about the following questions: 1. Why do these solids disappear in water? 2. Is the composition of any part of the solution the same? 3. After the solution is formed, is there separation of solid and liquid? 4. The solution at this time is pure..

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Update Time: 2024-07-29

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 2 industry PPT template

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