"Formation of Solution" Solution PPT Courseware 5

Description

"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. Explore the temperature changes of solutions when several substances dissolve in water.

Process and Method

Learn the methods of scientific experiments through experimental inquiry, and practice observing, recording, and analyzing experimental phenomena.

Emotional attitudes and values

We know that solution is an important type of substance and has important applications in production and life. And use the knowledge learned to solve some common problems in life, and establish the correct concept of learning knowledge and using knowledge.

think

What are the differences and connections between the two substances sucrose and sodium chloride after they are dissolved?

The difference: sucrose exists in the form of molecules in water, while sodium chloride exists in the form of ions.

Connection: After sucrose and sodium chloride are dissolved, as long as the water does not evaporate and the temperature does not change, the sucrose or sodium chloride will not separate from the water. If you take out any part of them for comparison, their compositions will be exactly the same.

1. solution definition

The dispersion of one or more substances into another substance to form a uniform, stable mixture.

2. Characteristics of solution

Homogeneous, stable, transparent mixture.

Homogeneity: After the solution is formed, the composition and properties of any part of the solution are exactly the same (referring to density, concentration, properties, etc.).

Stability: When the external conditions (including temperature and pressure) of the solution do not change, the components in the solution will not change.

Transparent mixture: All solutions are transparent mixtures.

A transparent mixture does not mean that the solution is a colorless liquid. Some solutions are colored. For example, copper sulfate solution is blue; ferrous chloride solution is light green; ferric chloride solution is yellow; potassium permanganate solution is purple-red. But most solutions are colorless liquids.

A homogeneous, clear, and stable liquid is not necessarily a solution.

think

What are the characteristics of mixtures of vegetable oils in water? Why is an emulsion with detergent added stable?

The mixture of vegetable oil and water is unstable. After shaking, a milky turbid liquid is obtained. In this liquid, small oil droplets composed of many molecules that are insoluble in water are dispersed. After standing, the vegetable oil and water will separate into layers. .

The emulsion added with detergent is stable because the detergent has an emulsifying function, which can disperse the vegetable oil into countless small droplets without gathering into large oil droplets.

emulsion

Definition: A mixture of small droplets dispersed into a liquid.

Characteristics: Milky turbid liquid, unstable, non-uniform, liquid layered.

emulsification

Definition: Emulsification is to disperse vegetable oil into countless small droplets without gathering into large oil droplets.

Emulsifier: A substance that prevents small droplets from clumping together.

Emulsifiers can disperse vegetable oil into countless tiny droplets rather than aggregate into large oil droplets. Small droplets can flow away with water.

Characteristics: Milky turbid liquid, stable.

3. Properties of solution

1. Some solutions can conduct electricity

Both anions and cations in the solution can conduct electricity.

2. Endothermic or exothermic phenomenon when substances dissolve

The diffusion process absorbs heat;

The hydration process releases heat.

An emulsion is a mixture of small droplets dispersed into a liquid.

Milky turbid liquid, unstable, uneven, liquid layered.

Class exercises

1. Which of the following statements is correct ( )

A． The solution must be a liquid

B． Air is also a solution

C. Mix 50mL alcohol and 50mL water to get 100mL solution

D. Salt water and sugar water are both solutions. If they are mixed together, they are not a solution.

2. Indicate the solute and solvent in the following solutions.

3. Which of the following statements about solutions is correct ( )

A． Homogeneous, stable liquids are solutions

B． The solution is a homogeneous, stable and pure substance

C. The solution is a colorless and transparent liquid

D. The solution is a homogeneous, stable mixture

4． When the following substances are put into water, the one that cannot form a solution is ( )

A． Edible oil b. Alcohol

C. salt d. sucrose

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Update Time: 2024-07-31

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

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