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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...