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"Formation of Solution" Solution PPT courseware download, 26 pages in total.
1. Course introduction
plants growing in nutrient solution
2. Solution
Experiment 1: Sucrose dissolves in water
【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 and compare them, 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.
【practise】
1. There is 100 ml of NaCl solution in the beaker. Please compare the density at A and B ( )
A. A > B B. A < B
C. A= B D. Can not be sure
2. When the water does not evaporate and the temperature does not change, after the KNO3 solution is left for one year, KNO3 will ( )
A. Will settle B. will not be separated
C. Will float on the water D. Can not be sure
3. 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.
4. 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
Keywords: Free download of PPT courseware for the second volume of the ninth grade of Chemistry published by the People's Education Press, PPT download of the formation of solution, PPT download of solution, .PPT format;
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