"Formation of Solution" Solution PPT Courseware (Lesson 1)

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"Formation of Solution" Solution PPT Courseware (Lesson 1), 22 pages in total.

new knowledge learning

Knowledge point 1: The process of dissolution

1. Observe the dissolution of table salt

In a small beaker containing about 50 mL of water, add a small spoonful of salt (the main component is sodium chloride) and stir with ________. The salt particles disappear in the water, forming a sodium chloride solution. When you touch the beaker, you feel the temperature ________, indicating that sodium chloride cannot change the temperature of the solution.

2. Understand the solution

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

(2) Add about 5 g of solid sodium hydroxide into a small beaker, stir, and measure the temperature of the solution (T2). T2 = ____ ℃, indicating that sodium hydroxide can make the temperature of the solution ______.

(3) Add about 5 g of ammonium nitrate solid into another small beaker, stir, and measure the temperature of the solution (T3). T3 = ____ ℃, indicating that nitric acid means that ammonium nitrate can make the temperature of the solution ______.

Interactive exploration

Exploration Point 1 Solution

[Question Exploration] After learning the concept of solution, the teacher’s questions and the students’ answers are as shown in the picture above. Which of the above three students can correctly describe the characteristics of the solution?

[Inductive improvement] The solution is a uniform and stable mixture. Uniformity means that the properties of each part are the same, including density, concentration, etc.; Stability means that the solution will not stratify when the external conditions remain unchanged; The solution is not necessarily colorless, for example, iodine and beer are colored.

Research point 2: Temperature changes when substances dissolve

[Question Research] By observing the changes in the liquid level in the U-shaped tube, can you accurately determine whether a substance absorbs heat or releases heat when it dissolves in water?

[Inductive improvement] When substances dissolve, they are usually accompanied by changes in energy. Some solutions increase in temperature, such as sodium hydroxide, concentrated sulfuric acid, etc.; some decrease, such as ammonium nitrate, etc.; some are basically Remain unchanged, such as sodium chloride, sucrose, etc. After adding solid sodium hydroxide, the temperature of the solution in the small test tube will increase, which will cause the gas in the gas collecting bottle to expand due to heat. The left end of the liquid level pressing against the U-shaped tube will drop and the right end will rise. If ammonium nitrate is added, it will cause the gas collecting bottle to expand. The gas in the cylinder shrinks when it is cold, and the external atmospheric pressure presses the liquid level. The left end of the liquid level in the U-shaped tube rises and the right end falls.

Class feedback

Knowledge point 1: The process of dissolution

1. Xiaoqi added a solid substance to the beaker as shown in Figure 13-1. After stirring, she found that the temperature increased, the paraffin melted, and the plastic pieces fell off. The substance added by the student may be ()

A. Sucrose b. Ammonium nitrate

C． Sodium chloride d. sodium hydroxide

2. The following description about the solution is correct ____________ (fill in the serial number).

① The solutions are colorless and transparent ② All parts of the solution are uniform ③ The solutions are stable as long as the external conditions do not change ④ Gas, liquid, and solid can be used as solutes ⑤ The solvent in the solution must be water ⑥ In the solution The rate of chemical reactions carried out in it is faster ⑦ Any solid substance dissolved in water can increase the temperature of the solution

Keywords: Free download of Chemistry PPT courseware for the first volume of the ninth grade of the Lujiao Education Edition, PPT download of the formation of solution, PPT download of solution, .PPT format;

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Update Time: 2024-11-22

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

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