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

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

Conjectures and Assumptions

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 is easy to sublime

5. Carbon dioxide can react with water

6. Non-flammable, non-combustible,

7. Carbon dioxide does not supply breathing

8. Carbon dioxide can react with lime water

9. Carbon dioxide can participate in photosynthesis of plants

10. Carbon dioxide can react with carbon

Exploration activity one: Can carbon dioxide dissolve in water?

Option One:

Add about 1/3 volume of water to a soft plastic bottle filled with carbon dioxide gas, cap the bottle immediately, and shake.

Phenomenon: The bottle becomes deflated;

Conclusion: Carbon dioxide can dissolve in water

Option II:

Add about 1/3 volume of water to a gas collecting bottle filled with carbon dioxide gas, cover it with a glass slide immediately, and shake. Invert the gas collection bottle.

Phenomenon: The glass piece will not fall;

Conclusion: Carbon dioxide can dissolve in water

Exploration Activity 2: Is the density of carbon dioxide greater than that of air?

Phenomenon: The end where carbon dioxide is poured sinks.

Exploration Activity 3: Why carbon dioxide can extinguish fires

Phenomenon: The lower candle goes out; the upper candle goes out later.

in conclusion:

1. Carbon dioxide is denser than air

2. Carbon dioxide is not flammable and does not support combustion.

Exploration activity five: Can carbon dioxide react with water?

ⅠSpray dilute acetic acid:

The purple flower turns red, indicating that litmus turns red when exposed to acid.

ⅡWater spray

There is no obvious change, indicating that water cannot make litmus red.

ⅢPut directly into CO2

There is no obvious change, indicating that carbon dioxide cannot make litmus red.

ⅣSpray water and put it into CO2

The florets turn red, indicating that carbon dioxide reacts with water to form acid.

�Heat the fourth flower

The florets turned purple again, indicating that the acid generated was easily volatilized or decomposed by heating.

1. Carbon dioxide

1. Physical properties of carbon dioxide

⑴Colorless and odorless

⑵ Denser than air

⑶Can be dissolved in water

⑷Solid carbon dioxide—dry ice, easy to sublimate

2. Chemical properties of carbon dioxide

⑴Normally, it is neither flammable nor combustion-supporting; it cannot provide breathing.

⑵Reacts with water to form carbonic acid;

CO2 + H2O== H2CO3

Carbonic acid is unstable and easy to decompose.

H2CO3== H2O + CO2

⑶Reacts with lime water to form white precipitate CaCO3.

CO2+Ca(OH)2=CaCO3↓+H2O

⑵Carbon dioxide and the “greenhouse effect”

①Causes of greenhouse effect:

Due to the extensive use of fossil fuels, forests have been destroyed, increasing the amount of carbon dioxide in the atmosphere and enhancing the "greenhouse effect."

② The harm of “greenhouse effect”:

Global warming, melting of polar glaciers, rising sea levels, submerging some coastal cities; abnormal climate, ecological imbalance; land desertification; reduction of agricultural production, etc.

③How to prevent the “greenhouse effect” from further increasing

Reduce the use of fossil fuels, develop and utilize clean energy, vigorously plant trees, and strictly prohibit indiscriminate deforestation.

Apply what you learn

1. Through what you just learned, can you now explain why Sprite and Coke are carbonated drinks?

2. Is distilled water stored for a long time still pure?

3. Observe the walls and mouth of the reagent bottle containing clarified lime water. What did you find? How did it form? How to remove it? and write relevant chemical equations.

4. People often use lime mortar to plaster walls. Lime mortar turns into a white and hard substance after being on the wall for a period of time. What is this substance? Do you know why you usually open the windows and light the charcoal brazier to dry it quickly? Why are the walls damp when the charcoal brazier is first lit?

discuss

Xiaoliang did the following experiments when exploring the reaction between carbon dioxide and water:

1. Spray water on the dry litmus florets. The florets do not change color.

2. Put the florets in Experiment 1 into carbon dioxide and turn them red.

So he concluded that carbon dioxide can react with water.

Do you think his conclusion is accurate? If it is not accurate, how can it be improved?

learn methods

Experimental methods of contrasting and controlling conditions are often used in scientific inquiry to draw correct conclusions by analyzing experimental phenomena under different conditions.

The following experiments were not compared ( )

A. Experiment on the relationship between molecular motion and temperature

B. Experiment on the relationship between the state of matter and molecular spacing

C. Experiment on the relationship between reaction rate and reactant contact area

D. Experiment of igniting magnesium strips in air to observe their combustion phenomena

in conclusion:

1. Carbon dioxide reacts with water to form carbonic acid:

CO2 + H2O == H2CO3

2. Carbonic acid is unstable and easily decomposes when heated:

H2CO3 ==CO2 ↑ + H2O

What questions related to Ca(OH)2 can be raised from the chemical equation Ca(OH)2+CO2=CaCO3↓+H2O?

1. Test the presence of carbon dioxide or identify carbon dioxide and other gases or remove small amounts of carbon dioxide

2. Explain the deterioration of lime water

3.Explain the white film that appears when lime water is left for a long time

4.Explain how hardening a wall with lime mortar

5. Keep eggs fresh

What questions related to CaCO3 can be raised from the chemical equation CaCO3+2HCl=CaCl2+H2O+CO2↑?

1. Preparation of CO2 in the laboratory (or production of carbon dioxide from egg shells or wall coverings)

2. Hydrochloric acid spilled on the marble floor produces bubbles

3. Use hydrochloric acid to wash away the white film produced by Jiusheng lime water.

4.. Soak eggs in dilute hydrochloric acid to make soft-preserved eggs (or egg subs)

5.Remove scale

6. Calcium supplement

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"The Properties and Uses of Carbon Dioxide" The World of Carbon PPT courseware:

"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 Purpose of study: 1. Explore the properties of carbon dioxide..

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Update Time: 2024-09-21

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

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