"Laboratory Preparation and Properties of Carbon Dioxide" PPT courseware

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"Laboratory Preparation and Properties of Carbon Dioxide" PPT courseware

Experiment purpose and supplies

Please read textbook P125 and think about the following questions:

The commonly used drugs for producing carbon dioxide are _________ and _______________.

Does producing carbon dioxide in the laboratory require an alcohol lamp and a water tank? Why?

Questions and Discussion

1. What two methods are commonly used in laboratories to produce oxygen? Write chemical equations and compare the states of reactants and reaction conditions.

2H2O2==2H2O+O2

2KMnO4==K2MnO4+MnO2+O2

2. What are the differences between analysis and preparation devices and why?

Since the state of the reactants and reaction conditions are different, the gas generating devices used are also different.

discuss

1. How to check whether the generated gas is carbon dioxide?

Answer: Pass the generated gas into clear lime water. If the lime water becomes turbid, it proves that the generated gas is carbon dioxide.

2. How to check whether the carbon dioxide is fully collected?

Answer: Use a burning wooden stick close to the mouth of the gas collecting bottle. If the wooden stick goes out, it means it is full.

Exploring the properties of carbon dioxide

(1) Drop litmus into white vinegar and the solution will turn ____ color

(2) Drop the litmus solution into water to observe the phenomenon; pass carbon dioxide into a test tube containing dry litmus paper and observe the phenomenon.

(3) Pour carbon dioxide into the purple litmus solution and observe the phenomenon.

(4) Heat the discolored solution slightly and observe the color change.

Carbon dioxide reacts with water

Phenomenon: Put the florets sprayed with water into carbon dioxide, and the purple litmus test solution turns red.

CO2 + H2O = H2CO3

Phenomenon: When heated, carbonic acid decomposes and carbon dioxide escapes from the solution, so the red litmus test solution turns purple again.

Carbonic acid is very unstable and breaks down easily

H2CO3＝H2O＋CO2↑

Why is there a film on the wall of the reagent bottle that has been holding lime water for a long time? How might it have come about?

The component of lime water is an aqueous solution of calcium hydroxide. Carbon dioxide in the air will react with calcium hydroxide to produce calcium carbonate precipitation. Because carbon dioxide comes into contact with the surface of the solution, a white film is formed on the surface of the solution. The reaction that occurs is:

CO2 + Ca(OH)2 = CaCO3 ↓＋ H2O

calcium carbonate

What problems did you find during the experiment? How did you solve it? Students communicate.

1. How to prove experimentally that carbonated drinks (such as soda) contain carbon dioxide?

2. Can other properties experiments be designed?

3. After-school homework and family experiments:

Use household kitchen supplies to produce carbon dioxide gas.

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Update Time: 2024-10-21

This template belongs to Chemistry courseware Hunan Education Edition Ninth Grade Chemistry Volume 1 industry PPT template

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