"Formation of Solution" Solution PPT Courseware 3

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"Formation of Solution" Solution PPT Courseware 3

Students consider the following questions:

1. Why do these solids "disappear" in water?

2. Is the composition of any part of the solution the same?

3. After the solution is formed, is there separation of solid and liquid?

4. Is the solution at this time a pure substance or a mixture?

Notice:

1. Is a transparent, uniform, and stable liquid necessarily a solution?

For example: pure water and alcohol are pure substances, not solutions.

2. Is the solution necessarily colorless?

Copper sulfate solution (blue)——Cu2+

Ferric chloride solution (yellow)——Fe3+

Ferrous chloride, ferrous sulfate solution (light green) - Fe2+

Potassium permanganate solution (purple red)——MnO4-

[Experiment 9-2】Solubility of different solutes in different solvents

in conclusion:

1. Water is the most common solvent, and gasoline, alcohol, etc. are also commonly used solvents;

2. The same solute has different solubility in different solvents;

3. Different solutes have different dissolving abilities in the same solvent.

Think about it:

1. The solute in the solution formed when quicklime (CaO) is dissolved in water is _______ and the solvent is _______.

2. The solute in the solution obtained after a certain amount of iron reacts completely with dilute sulfuric acid is _______solvent_______.

Activities and Inquiry

With the existing test tubes, beakers, glass rods, thermometers and other instruments as well as solid NaCl, NH4NO3, NaOH (you can also choose other instruments and medicines), try to design an experimental plan to explore whether they release heat or absorb heat when dissolved in water.

1. Experimental plan:

(1) Pour a certain mass of water into three beakers, and then measure the water temperature

(2) Put a certain amount of the three solids into the above three beakers, stir and measure the temperature

(3) Compare the temperature changes before and after

2. Experimental diagram:

Thinking: As shown in the picture on the right, a certain amount of the following substances are added to the small test tube. The liquid level in the U-shaped tube on the right does not change significantly. The substance is ( )

A． Sodium hydroxide solid

B． Concentrated sulfuric acid

C. Ammonium nitrate crystals

D. sodium chloride crystals

Practice in class:

1. Which of the following liquids is a solution? (fill in the serial number)

① Beer ② Water ③ Mud water ④ Clarified lime water ⑤ Hydrochloric acid

2. If the density of the upper part of a certain cup of salt water placed for a long time is a g/cm3, then the density of the lower part is ( )

A. Greater than a g/cm3 B. Equal to a g/cm3

C. Less than a g/cm3 D. Unable to judge

3. Among the following cleaning methods, which one uses emulsification ( )

A. Wash your hands with tap water B. Use gasoline to clean oil stains

C. Use detergent to wash greasy tableware D. Use hydrochloric acid to remove rust

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Update Time: 2024-07-31

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 2 industry PPT template

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