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"Solubility of different substances in water" Dissolution PPT download
Part 1: The solubility of salt and baking soda in water
1. Compare and observe the solubility of salt and baking soda in water
Purpose of the experiment: By dissolving salt and baking soda in water respectively, comparing the dissolving abilities of salt and baking soda, and verifying that the dissolving abilities of different substances in water are different.
Experimental materials: 2 beakers, 2 stirring rods, 20 grams of salt, 20 grams of baking soda.
Experimental steps:
(1) Take about 20 grams each of salt and baking soda, and divide them into 8 small portions.
(2) Put 50 ml of water in each of the two beakers.
(3) Add a small portion of salt and a small portion of baking soda to the two beakers, and stir. After the added salt and baking soda are completely dissolved, add the second portion and stir. Until the salt and baking soda cannot be dissolved, record the number of portions added in the experiment record sheet.
The solubility of different substances in water PPT, part 2: The solubility of gases in water
1. Observe the dissolution of gas in water
Purpose of the experiment: Observe bubbles dissolved in soda through experiments and understand the dissolution of gas in water.
Experimental materials: 1 bottle of soda, 1 syringe.
1. Observe the liquid in the syringe. Aspirate one-third of the liquid with a syringe and seal the mouth of the tube with a rubber cap.
2. Pull out the plunger of the syringe and observe the liquid in the syringe.
3. Push the plunger of the syringe inward and observe the liquid in the syringe.
What is the conclusion of the experiment?
Experimental conclusion: Some gases (such as oxygen, carbon dioxide, etc.) can be dissolved in water and can also be precipitated from water. Dissolving gases in water is a reversible process.
2. The connection between the solubility of gases in water and life
How do animals and plants in water breathe?
In addition to dissolving solids and liquids, water can also dissolve gases such as oxygen and carbon dioxide in small amounts. Animals and plants in the water rely on oxygen dissolved in the water to breathe.
Do different substances have the same ability to dissolve in water?
Different substances have different solubility in water. The solubility of substances in water can provide great help to people's production and life.
PPT on the solubility of different substances in water, Part 3: Classroom exercises
1. Fill in the blanks
1. Animals and plants in the water breathe by ______________ dissolved in the water.
2. The dissolution of gas into water is a __________ process.
3.50 ml of water can dissolve approximately _________ grams of table salt.
4.Knowing the ability of a substance to dissolve in water can help _______________.
2. Judgment questions
1. Under the same conditions, the solubility of different substances in water is the same. ( )
2. The masses of salt and baking soda that can be dissolved in 100 grams of water are the same. ( )
3. Add sugar and baking soda to the same amount of water. The more dissolved, the weaker the solubility of this substance in water ( )
4. Table salt is more soluble in water than baking soda. ( )
3. Short answer questions
1. Shake a Coke bottle filled with Coke. What will happen when you unscrew the bottle cap? Why does this happen?
There was gas spurting out, and a lot of bubbles were produced in the water. Because the gas in Coke is dissolved by pressurization, the gas came out as soon as the bottle was opened.
2. Animals and plants both need oxygen. Why can they live in water?
Animals and plants in the water rely on oxygen dissolved in the water to breathe.
PPT on the solubility of different substances in water, Part 4 content: Class summary
1. Different substances have different solubility in water. The solubility of salt is stronger than that of baking soda. The gas in soda contains carbon dioxide dissolved through pressurization or chemical methods.
2. Water can dissolve solids and liquids, and can also dissolve oxygen and carbon dioxide in small amounts. Animals and plants in the water breathe through oxygen dissolved in the water.
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"How many grams of salt can be dissolved in 100 ml of water" Dissolution PPT Part 1 Content: How many grams of salt can be dissolved in 100 ml of water 1. Experimental plan to study how many grams of salt can be dissolved in 100 ml of water Determine the question to be discussed: To study how much can be dissolved in a glass of water grams of table salt, must...