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"Dissolution Fast and Slow" Dissolution PPT Download
Part 1: Which one dissolves faster?
1. Explore whether stirring can speed up the dissolution of salt
Experimental purpose: to test whether stirring can speed up dissolution.
Experimental materials: 2 beakers, 20 grams of salt, 1 stirring rod.
Experimental steps:
(1) Take two portions of the same amount of table salt, about 10 grams each, and put the same amount of water (30 mg) into it. Keep one cup still and stir the other cup with a stirring stick.
(2) Organize observation information and fill in the experiment record form
What is the conclusion of the experiment?
Experimental conclusion: The speed of dissolution of soluble solid substances (such as table salt) in water is related to whether the liquid is stirred.
Can temperature speed up dissolution?
2. Explore whether temperature can speed up the dissolution of salt
Experimental purpose: to test whether temperature can speed up dissolution.
Experimental materials: 2 beakers, salt, cold water, hot water, etc.
Fast and slow dissolution PPT, Part 2: Research on accelerating the dissolution of fruit sugar
What factors affect the dissolution of fruit sugar? What methods can be used to speed up dissolution?
How to choose experimental materials? How much water was used for the experiment?
(1) Determine experimental projects
Use the conclusions in "Activity 1" to conduct comparative experiments to explore what factors affect the dissolution of fruit sugar and how to speed up the dissolution of fruit sugar.
What are the experimental results?
Methods to speed up the dissolution of fruit sugar include stirring, heating, and crushing fruit sugar.
Dissolving fast and slow PPT, part 3: Classroom exercises
1. Judgment questions
1. Temperature has a certain impact on the speed of substance dissolution. ( )
2. The speed of dissolution is only related to the substance itself and has nothing to do with other conditions. ( )
3. The three methods of accelerating dissolution are used separately in most cases in life. ( )
4. The speed of dissolution of soluble solid substances (such as table salt) in water is related to stirring. ( )
2. Multiple choice questions
1. The fastest way to dissolve fruit sugar is ( )
A Stir it with your tongue B Keep it in your mouth without moving C Bite it into pieces and stir it with your tongue
2. Which kind of water will make the fruit sugar dissolve faster. ( )
A normal temperature B cold water C hot water
3. In the comparative experiment, the correct statement is ( )
A One condition is different B Two conditions are different C Three conditions are different
3. Short answer questions
1. Think carefully about where dissolution is used in life and how to speed up dissolution. Please give at least 2 examples to explain.
(1) How to speed up the dissolution of rock sugar by chewing it into pieces and stirring it with your tongue.
(2) How to brew coffee to speed up dissolution: brew with hot water and stir with a spoon.
2. Explore whether stirring can speed up the salt dissolution experiment, fill in the comparison record table of fast and slow dissolution, and write the experimental conclusion.
Dissolving fast and slow PPT, part 4 content: Class summary
1. The speed of dissolution of soluble solid substances (such as table salt) in water is related to whether the liquid is stirred and the temperature of the water.
2. Comparative experiments are two sets of experiments in which the other conditions are the same except for one condition that needs to be studied.
3. Grinding, heating, stirring and other methods can speed up the dissolution of substances in water.
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