Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 2

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"Understanding Solutions" Solution PPT Courseware

Exploration Experiment 1: What is a solution?

①Add 10mL water into the test tube, then add a small amount of salt, shake and let stand

②Add 10mL water into the test tube, then add a small amount of sucrose, shake and let stand

③Add 10mL water into the test tube, then add a small amount of vegetable oil, shake and let stand

④Add 10mL water into the test tube, then add a small amount of soil, shake and let stand

1. Solution - a homogeneous and stable mixture

1. Definition of solution:

(One or several substances are dispersed into another substance to form a uniform, stable, and transparent mixture, which is called a solution.)

Example: sodium chloride dissolves in water, sucrose dissolves in water, copper sulfate dissolves in water

2. Turbid liquid

Substances like soil are dispersed into water as fine solid particles, forming a suspension (or slurry).

Example: soil and water

Substances like vegetable oil disperse into water in small droplets, forming an emulsion (or emulsion).

Example: vegetable oil and water

Characteristics: Heterogeneous, unstable, mixture

2. Substances dissolve to form solutions

1. Understand the composition of solutions

Taking ④ sucrose solution and ⑥ sodium chloride solution as examples, how to comprehensively describe the composition of the solutions?

①Material perspective:

Solute: The substance that is dissolved is called solute.

Solvent: A substance that can dissolve other substances is called a solvent.

(water, alcohol, gasoline)

Unless otherwise specified, the solvent is water

m liquid = m agent + m substance

②Element angle

Taking ④ sucrose solution and ⑥ sodium chloride solution as examples, how to comprehensively describe the composition of the solutions?

Lenovo. Enlightenment

Add solid sodium chloride to enough water to form a sodium chloride solution after the solid is completely dissolved. Try to analyze the reasons why solid sodium chloride gradually disappears in water from the perspective of particles

There are gaps between molecules, and the molecules are constantly moving

[Class Exercise 2]:

1. Determine the solute and solvent in the following solutions

KMnO4 solution KMnO4 water

iodine iodine alcohol

Hydrochloric acid HCl gas water

10ml gasoline gasoline soybean oil

90ml soybean oil

90ml alcohol alcohol water

10ml water

2. Decide whether the following statements are correct

(1) Uniform and stable liquids must be solutions.

(2) The solutions must be colorless and transparent.

(3) The solutions must be uniform and stable mixtures.

(4) There can be only one type of solute in the solution.

(5) The density of the lower part of the salt water is higher than that of the upper part.

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"Understanding Solutions" Solution PPT Courseware 2:

"Understanding Solutions" Solution PPT Courseware 2 Knowledge Review Knowledge Point 1 Solution 1. Concept: refers to a uniform and stable mixture formed by ____________ substances dispersed into ________ substances. 2. Features: Uniformity, stability Uniformity refers to any...

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Update Time: 2024-09-08

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