"Chemistry and Environment" Chemistry and Social Life PPT Courseware

Description

"Chemistry and Environment" Chemistry and Social Life PPT Courseware

knowledge network

Chemistry and Environment

acid rain

Cause: Fossil fuel combustion produces large amounts of nitrogen and sulfur oxides

Hazards: endanger biological safety, damage buildings, forests, etc.

Treatment methods: eliminate sources of pollution, etc.

greenhouse effect

Definition: A way of retaining heat on the Earth's surface

Cause: The burning of fossil fuels produces large amounts of carbon dioxide, etc.

Hazards: melting ice and snow, rising sea levels, etc.

protect environment

Dust pollution and hazards

Solid waste recycling

Knowledge review

Knowledge point 1 Environmental pollution

1. Environmental pollution includes _________, _________, __________ and __________, etc.

2. Air pollution: Due to human production and life, the concentration of various pollutants emitted into the atmosphere _______ exceeds the limit allowed by the environment, thus causing ___________ to the survival of living things, human health and normal industrial and agricultural production. The phenomenon.

Knowledge point 2 Acid rain

1.Acid rain

(1) Definition: refers to precipitation (including rain, snow, frost, dew, fog, hail, etc.) with a pH less than _____.

(2) Cause: During the burning process of fossil fuels, a large amount of _______________ is produced, which is discharged into the air and reacts with water vapor to form ___________, which falls with rain and forms acid rain.

2. Hazards of acid rain:

(1) Causes fish to _____ and affects the growth and reproduction of aquatic organisms;

(2) Make the soil ______ and destroy the growth of crops and forests;

(3) Cause _____ damage to bridges, works of art, buildings, machines, etc.;

(4)______ human health.

3. Prevention and control of acid rain:

(1) ____ pollution sources and reduce emissions of sulfur dioxide and nitrogen oxides;

(2) Develop and utilize _______ to replace fossil fuels;

(3) Fossil fuels are used after removing ___;

(4) The exhaust gas is discharged after _________.

4. Chemical method to remove sulfur - the flue gas contacts the absorption liquid containing ________, causing sulfur dioxide to dissolve in water and react with the absorbent and oxygen to form gypsum.

Example analysis

►Type 1 Air pollution and control

Proposition perspective: Examine students’ understanding of air pollution and its prevention and control

Example 1 Acid rain is one of the obvious manifestations of serious air pollution. The main substance that forms acid rain is ( )

A． Methane and carbon monoxide

B． Sulfur dioxide and carbon monoxide

C. carbon monoxide and carbon dioxide

D. Sulfur dioxide and nitrogen dioxide

[Analysis] Acid rain refers to rainwater with a solution pH less than 5.6. The pH of normal rainwater is about 5.6. Acid rain is mainly caused by acid gases such as sulfur dioxide and nitrogen oxides produced by the burning of fossil fuels. After complex atmospheric chemical reactions, they are absorbed and dissolved by rainwater. become.

A. Methane and carbon monoxide are not gases that form acid rain, so the option is wrong;

B. Carbon monoxide is not a gas that forms acid rain, so the option is wrong;

C. Excessive carbon dioxide emissions will cause the greenhouse effect. Carbon monoxide and carbon dioxide are not gases that form acid rain, so the option is wrong;

D. Sulfur dioxide and nitrogen dioxide undergo complex atmospheric chemical reactions, are absorbed and dissolved by rainwater, and can form acid rain, so the option is correct;

So choose: D.

►Type 2: Hazards and treatment of solid waste

Propositional perspective: Examine students’ understanding of solid waste recycling

Example 2 Solid waste is an environmental pollutant. The most reasonable way to deal with it is ( )

A． Dump into landfill

B． thrown into the high seas

C. Throw it into the deep mountains and old forests

D. Classify recycling and carry out pollution-free treatment

【Analysis】

A. Dumping garbage into landfill is not conducive to saving resources, so A is wrong;

B. Throwing it into the high seas can easily cause water pollution, so B is wrong;

C. Throwing it into deep mountains and old forests can easily cause environmental pollution, so C is wrong;

D. Classified recycling and pollution-free treatment can save resources and protect the environment, so D is correct;

So choose D.

►Type 3: Protect the environment

Propositional perspective: Examine students’ understanding of environmental protection

Example 3 Human beings only have one earth. For the sustainable development of society, environmental protection issues must be addressed, and chemistry can play an important role in this regard. Which of the following treatment measures will not contribute to environmental protection ( )

A． Add sewage treatment plants

B． Coal-fired plants increase chimney heights

C. Garbage sorting, recycling and processing

D. Build wind power plants instead of thermal power plants

[Analysis] A. Water pollution pathways include: arbitrary discharge of industrial wastewater, agricultural wastewater, and domestic sewage, and arbitrary use of chemical fertilizers and pesticides. Therefore, adding sewage treatment plants can reduce pollution, so A is correct;

B. Increasing the height of chimneys in coal-fired factories cannot reduce pollutant emissions and does not help environmental protection, so B is wrong;

C. Mildew in garbage will produce toxic substances that will pollute the environment and affect your health, so the garbage must be sorted, recycled and reprocessed, so C is correct;

D. Building wind power generation is pollution-free, can reduce the pollution caused by thermal power generation, and is conducive to environmental protection, so D is correct;

So choose B.

Keywords: Chemistry and Social Life Teaching Courseware, Chemistry and Environment Teaching Courseware, Beijing Curriculum Reform Version Ninth Grade Volume 2 Chemistry PPT Courseware Download, Ninth Grade Chemistry Slide Courseware Download, Chemistry and Social Life PPT Courseware Download, Chemistry and Environment PPT Courseware Download, .PPT format;

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Update Time: 2024-09-09

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 2 industry PPT template

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