"The Properties and Uses of Carbon Dioxide" The World of Carbon PPT Courseware

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"The Properties and Uses of Carbon Dioxide" The World of Carbon PPT Courseware

1. Properties of carbon dioxide

The picture shows the device for producing carbon dioxide:

Thinking: How to check whether the gas collecting bottle is full?

Explore the properties of carbon dioxide

Research purpose:

1. Explore whether carbon dioxide is denser than air.

2. Explore whether carbon dioxide supports combustion.

3. Explore whether carbon dioxide is soluble in water.

Research experiment 1. Experiment of pouring carbon dioxide

Explore questions

1. Why does the candle in the beaker go out? What are the properties of carbon dioxide?

2. Why do the lower candles go out first and the upper candles last?

3. According to this test, what properties does carbon dioxide have?

Research experiment 2. Is carbon dioxide soluble in water?

Carbon dioxide can dissolve in water, reducing the air pressure inside the bottle, so the bottle will become deflated.

Research experiment 3. When carbon dioxide dissolves in water, does it react with water?

(Ⅰ) Spray dilute acetic acid (Ⅱ) Spray water

(III) Directly put into carbon dioxide

(IV) Spray water and then put it into carbon dioxide

(1) 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↑

(2) Reaction with lime water

Phenomenon: Clear lime water becomes turbid.

CO2 + Ca(OH)2 = CaCO3 ↓＋ H2O

calcium carbonate

Discussion: In order for walls plastered with lime mortar [Ca(OH)2] to dry quickly, why is it often necessary to build a charcoal brazier indoors? Why are the walls damp when I start to put the charcoal brazier?

2. The impact of CO2 on life and the environment

(1) The impact of CO2 on life and production

(2) The impact of CO2 on the environment (greenhouse effect)

① Carbon dioxide gas in the atmosphere can, like the glass or plastic film of a greenhouse, prevent the energy of sunlight absorbed by the ground from dissipating, thus causing global warming. This phenomenon is called the "greenhouse effect."

②Hazard

a. The polar glaciers melt and sea levels rise.

b. The climate is abnormal and ocean storms are increasing.

c. The land is dry and the desertification area is increasing.

③Preventive and control measures

a. Minimize the use of fossil fuels

b. Use clean fuels such as solar energy and wind energy

c. Vigorously plant trees and strictly prohibit indiscriminate logging

What should we know after studying this lesson?

1. Carbon dioxide does not burn and does not support combustion. It can react with water.

2. Carbon dioxide can make clear limewater turbid. This reaction can be used to test carbon dioxide.

3. Greenhouse effect and measures to be taken to prevent its enhancement

1. Multiple choice questions

1. The density of carbon dioxide compared to air ( )

A. Larger than air B. Smaller than air

C. Equal to air D. Unable to judge

2. Solubility of carbon dioxide in water ( )

A. Hardly soluble in water B. Soluble in water

C. Slightly soluble in water D. Not easily soluble in water

3. Among the following operations, only physical changes occur ( )

A. Pass carbon dioxide into the water

B. Pass carbon dioxide into clear lime water

C. Pour carbon dioxide into a beaker with a burning candle

D. Pressurize, cool, and compress carbon dioxide into dry ice

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"The Properties and Uses of Carbon Dioxide" The World of Carbon PPT Courseware 2:

"The Properties and Uses of Carbon Dioxide" The World of Carbon PPT Courseware 2 Conjectures and Hypotheses Properties of carbon dioxide 1. Colorless and odorless gas 2. Carbon dioxide can be dissolved in water 3. Carbon dioxide is denser than air 4. Solid carbon dioxide sublimes easily 5. Carbon dioxide can be dissolved with water water reaction...

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Update Time: 2024-11-22

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 1 industry PPT template

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