Step 1: Choose a sunny morning, put a carton in a cool place outside, and put a thermometer next to the inside of the carton.

[Laboratory supplies] Cylinder, glass beaker, trapezoidal iron sheet, spray bottle, alcohol lamp, rubber stopper (with catheter)

Settings.

Sprite, mineral water bottle (soft texture), candles (several of each length), transparent lime with dried litmus.

[teaching]

Design intention of teacher-student activities

First, the introduction of new courses.

(Courseware animation) Someone took a puppy to Java Poison Valley, and the dog fainted, but who was safe and sound; No one fainted when people bent down to drink dogs. Why is this?

[About] This is caused by carbon dioxide. So, is the nature of carbon dioxide like this? Let's discuss it together in this class. And the blackboard theme.

Properties and uses of carbon dioxide.

Students watch the animation.

Students recall the knowledge of carbon dioxide,

Feel full of energy and progress.

① Stimulate students' interest in learning through animation.

(2) Stimulate students' interest in inquiry through animation and exploration activities.

Experimental exploration of two students

Teachers arrange the contents of students' experiments, take preventive measures at the same time, remind operators to check and guide students to explore experiments.

(After the students' inquiry, the report shows big-screen communication. )

1, physical properties: In general, carbon dioxide is a colorless and odorless gas, easily soluble in water (1: 1), and its density is higher than that of air.

2, chemical properties:

(1) generally can't burn, and it doesn't support burning.

Under the guidance of teachers' group experiments, students:

(Students explore the contents of Annex 2)

Student experiment 1

Observe the color, state and smell of a bottle of carbon dioxide.

2 experimental teaching for students [Experiment 6-4]

Experimental Teaching of Three Students [Experiment 6-5]

After students explore the nature of absorbing carbon dioxide, they complete a good "experimental report" and report the exchange. )

Learn scientific experiments, observe and record, and preliminarily analyze the learning phenomenon of experiments.

[Transition] Is there any chemical change when carbon dioxide is dissolved in water?

(Guide students to explore constantly, communicate after the investigation report, and then show it on the big screen)

② Carbon dioxide reacts with water to generate unstable carbonic acid.

CO2 + H2O = H2CO3

H2CO3 = H2O + CO2↑

Carbonic acid is unstable and will decompose rapidly when heated.

& gt

(Pre-analysis, animation guides students to answer questions in class)

Students continue to explore experimental activities.

Student Experiment 4: Attachment 3

Textbook [Experiment 6-6]

Students report and explore after exchange.

An animation class in which students used to analyze problems.

Students' cooperative spirit, learn to draw conclusions from experiments.

Students' oral expression ability.

And answer questions before class, so that students are interested in continuing.

[About] The production of carbonated drinks such as soda is based on the fact that carbon dioxide can be dissolved in water. (Showing a bottle of Sprite) Can you design an experiment to prove that the beverage containing carbon dioxide gas is? principle

(Organize students to discuss and ask them to demonstrate)

[About] This reaction is caused by the precipitation of white calcium carbonate from carbon dioxide and lime. (using a large screen display)

③ Carbon dioxide and lime

Ca(OH)2 = CaCO3↓+ H2O for the reaction of CO 2+

> This reaction is often used to verify or identify carbon dioxide.

① Students think and participate in class discussion and evaluation.

(2) positive thinking, bold ideas.

(3) Stage demonstration experiment proves his guess.

Guide students to actively participate in designing their own experiments and cultivate their ability to explore experiments.

Encourage students to evaluate scientifically in time so that students can have a good emotional experience. Experience, our life is inseparable from chemistry.

[Media Player] What (see Annex 4)

What is ice? What is the relationship between dry ice and carbon dioxide? Please read the textbook P 1 15.

What other uses does carbon dioxide have? Continue to read the content materials about P 1 16, and finish the report about the exchange.

(big screen display) using carbon dioxide

[Transition] Carbon dioxide plays such an important role. Is carbon dioxide better?

Organize teaching students to read about the "greenhouse effect" and think about how to prevent it.

About the "greenhouse effect"

Multimedia player information.

(See Annex 5)

Discussion: How to prevent the greenhouse effect? As students, what should we do to reduce the greenhouse effect?

After the students finish the discussion, use the big screen monitor. )

Teach students to read students' books.

Teach students to watch and listen,

And participate in the discussion.

① Use modern information technology to give full play to the role of multimedia teaching.

② Students' habits of plug-ins, texts and reading materials.

Let students feel the environment around us, which is closely related to us. The importance of protecting the environment and enhancing students' environmental awareness.

Guide students to learn this lesson.

Implementation outline (then displayed on the big screen)

(see attachment 1)

Students learn to summarize, learn to learn, and systematize their knowledge.

Let students organize knowledge and formulate principles.

[Classroom] (see Annex 6)

Students guess, hands-on verification,

And think about the reasons.

Cultivate students' vision, promote the application of knowledge and strengthen the connection between disciplines.

【 Homework 】 (See Annex 7) Learn the lesson and complete the exercise.

Consolidate in time and strengthen understanding and memory.

Attachment 1

[Blackboard Design]: (Displayed on the big screen)

Theme 3 Carbon dioxide and carbon monoxide

First, put carbon dioxide

Physical properties of 1: Under normal circumstances, carbon dioxide is a colorless and odorless gas, which can be dissolved in the density ratio of water (1: 1) and air.

2 Chemical properties: ① It cannot burn, and generally does not support combustion. (No breathing)

② The reaction with water to produce carbonic acid is unstable.

CO2 + H2O = H2CO3

Unstable carbonate decomposes, and the decomposition speed will be faster.

H2CO3 = CO2↑+ H2O

③ React with lime

Ca (OH) 2 with CO 2+= CaCO3↓+ H2O (carbon dioxide gas that can be identified by this reaction)

Uses: ① Photosynthesis of raw materials; ② gas fertilizer; 3 fire; ④ Ice is used as refrigerant and artificial rainfall; ⑤ Chemical raw materials.

Four kinds of greenhouse gases

(1) Carbon dioxide, ozone, methane, chlorofluorocarbons and other representative alkyl groups can produce the greenhouse effect.

(2) Greenhouse gas mitigation measures

Change the energy structure, reduce the use of fossil fuels such as coal, oil and natural gas, and make more use of clean energy such as solar energy and wind energy.

(2) Vigorously plant trees, prohibit deforestation and protect green space.

③ Save paper and do not use disposable chopsticks.

Attachment 2:

Attachment 3: Student Experiment 4

Attachment 4: Dry Ice Artificial Rainfall

Medium > The oil field has been explored by the US Geological Survey. They deepened with one punch and suddenly ejected a large number of solid diamonds like snowflakes from the ground. Curious players approach snowballs, causing their hands to blister and turn black. It turns out that "snow" is not snow, but a person named "ice".

"Ice" is not ice, it will not form condensed water, but it is cooled by colorless gas pressurized carbon dioxide, so dry ice is solid carbon dioxide. Dry ice sublimates, absorbs a lot of heat, thus reducing the temperature of the surrounding air, and there is no liquid residue, thus playing the role of refrigerant. If ice is sprinkled from a high-altitude plane, due to the sublimation and heat absorption of dry ice, water vapor quickly condenses into water droplets in the air, and it begins to rain. This is the secret of artificial rainfall with dry ice. Annex 5

Greenhouse effect 100 years ago, the concentration of carbon dioxide in the air remained constant. With the development of industrialization of coal, oil, natural gas and other fuels, a large amount of carbon dioxide is produced. Coupled with the population explosion, forests are being cut down and the carbon dioxide content in the atmosphere is increasing. Human activities, on the one hand, consume a lot of oxygen and produce carbon dioxide, on the other hand, weaken the channel of absorbing carbon dioxide, and the balance between oxygen and carbon dioxide in nature is destroyed, leading to the greenhouse effect. From 1860 to 1970, the content of carbon dioxide in the atmosphere increased from 0.028% to 0.032% and continued to increase. According to computer simulation, in the next few decades, carbon dioxide will double, the global average temperature will rise from 2℃ to 35℃, and the polar regions may rise by 10℃. Rising temperatures will lead to melting glaciers and rising sea levels. On the coast of13 of the world, or within 60 kilometers, there are cities in danger of being swallowed up by the sea. A recent study by the authorities of Taiwan Province Province pointed out that if the sea level rises by one meter, Taiwan Province Province will lose 272 square kilometers of land, and more than 500,000 people in Taiwan Province Province will be threatened. The visible "greenhouse effect" caused by disasters is global.

In order to avoid this kind of disaster, people have put a lot of brains into it. Of course, in recent years, Taiyuan University of Technology has been devoted to the research topics of acid synthesis such as carbon dioxide methane, carbon dioxide, synthetic alcohol and carbon dioxide reforming. Obviously, this is a noteworthy way to overcome the energy crisis and environmental protection, which complement each other.

Attachment 6 [Classroom Exercise]

1, (guess what it is, the exact answer), as shown in the picture on the right, the observed phenomenon is that two candles are lit in length and then held in a big beaker:

Guess what, the phenomenon you predicted.

① Two candles go out from low to high; [You are based on]

BR/>； ② Two candles are extinguished in descending order; [The exact answer depends on the experimental results]

(3) Two candles are extinguished at the same time. [Your explanation is]

2. Xiao Ming's exploratory experiment as shown in the picture on the right and "The gas exhaled by human body is the CO2 content in the air". Experimental operation and observation, as shown in the figure:

(1) According to the experimental results, Xiao Ming's conclusion is affirmative.

(2) Write a chemical equation to illustrate the change of lime in this experiment:

(3) Bob wants to know more about the changes in the human body and the reasons for the carbon dioxide content in exhaled and inhaled gases. By consulting the data, he knew that this was due to the communication mechanism between alveoli and blood, blood and tissue cells.

See Annex 7 [] for the combined exercise.

1, the amount of carbon dioxide in the vegetable greenhouse, its purpose is ()

A, suffocating pests, effectively controlling pests and diseases, and avoiding fires.

C, promote plant photosynthesis d, temperature rise.

2, the test method of carbon dioxide in the greenhouse is colorless gas ()

A, purple litmus gas enters solution B, and the gas flows from one container to another.

C, introducing the gas of the ignited wooden telescopic sleeve D into limewater.

3. Each test tube containing 5ml distilled water drops contains litmus test solution, which is heated with carbon dioxide gas, and a small amount of activated carbon is sprinkled in another test tube. Its color changes are as follows: ① Red-Purple-None ② Purple-Red-Purple ③ Purple-Red-None ④ None-Red-None, which is correct ().

a、① ② B、② 4C、② 3D、① ③

4, the physical properties of the material used in this substance, but also the chemical properties of this substance are used for the following purposes ()

A, used to extinguish carbon dioxide, using graphite as electrode C, artificial precipitation of ice D, coke metallurgical industry.

In order to protect our earth and human survival, we should limit the emission of carbon dioxide and control the increasingly serious global warming problem.

(1) Scientists use the technology of "component conversion" to mix and react a certain proportion of carbon dioxide and hydrogen under certain conditions to generate an important chemical raw material and water. The chemical equation of the reaction is 2CO2 +6 H2 =()+4 H2O, which is an important chemical raw material.

(2) In order to slow down the increase of carbon dioxide content in the atmosphere, the following suggestions are feasible (fill in the figures).

(1) A large number of trees are planted, and deforestation is prohibited; BR p> (2) It is forbidden to use fossil fuels such as coal, oil and natural gas;

③ Make more use of nuclear energy, solar energy, wind energy and geothermal energy.

In the 6th century,17th century, in this research, the famous British scientist priestley made the following experiment: a glass bell jar with a lighted candle was fixed with a little mouse for the experiment. After a period of time, the candle will gradually go out and the mouse will start to twitch until it dies. Is priestley troubled by the phenomenon that rats suffer from air pollution? So, after dealing with the above experiment, he repeated it with clean air, and the mice used in the experiment could not survive!