"Formation of Solution" Solution PPT

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"Formation of Solution" Solution PPT, 30 pages in total.

1. Course introduction

plants growing in nutrient solution

2. The process of dissolution

Activity 3-1: Observe the dissolution of table salt

1. Why are the salt particles missing?

Sodium chloride dissolves.

2. Think about it, are the top, middle and bottom parts of this glass of salt water equally salty?

When sodium chloride is dissolved in water, each part of the solution has a salty taste, and the degree of saltiness is the same.

3. If the salt water is sealed and stored for one month, one year, two years...do you think the salt particles will precipitate from it?

No salt particles will separate from the water.

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.).

3. Use of solution

Soilless plants grown in nutrient solution

Medical applications of solutions

4. Temperature changes when substances dissolve

Experimental Exploration 3-1: Temperature changes when substances dissolve

1. Take two small beakers, add about 50 mL of distilled water to each, and measure the water temperature T1 with a thermometer.

2. Add about 5 g of sodium hydroxide to a small beaker, stir, and measure the temperature T2 of the solution with a thermometer.

3. Add about 5 g of ammonium nitrate to a small beaker, stir, and measure the temperature T3 of the solution with a thermometer.

Thinking: The temperature of the solution changes, indicating that the substance may absorb energy from the water or release energy into the water when it is dissolved in water. Do you agree with this view?

5. Emulsification phenomenon

【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. .

emulsion

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

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

6. Classroom 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. 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

3. 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: 2024-10-01

This template belongs to Chemistry courseware Lu Jiao Edition Ninth Grade Chemistry Volume 1 industry PPT template

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