"Our Water Resources" Source of Life - Water PPT Courseware 3

Description

"Our Water Resources" Source of Life - Water PPT Courseware 3

learning target:

1. What is the volume fraction of fresh water in the earth’s water resources?

2. What is my country’s per capita freshwater possession in the world?

3. Do you waste water? How to save water

Measures to prevent water pollution:

(1) Reduce the generation of pollutants;

(2) Treat industrial wastewater to make it comply with discharge standards;

(3) Reasonable use of chemical fertilizers and pesticides in agriculture;

(4) Domestic sewage should be treated centrally before being discharged.

[Summary of this lesson]

1. Water resources owned by humans

71% of the earth is covered with water. Why are there still many countries and regions in the world facing water shortage crisis?

1. Freshwater resources are relatively small (only 0.769% of water resources can be directly utilized);

2. Uneven distribution of freshwater resources (more than 80 countries are short of water)

3. With the development of society, water consumption increases

4. With the development of society, water resources are polluted.

2. Protect water resources (1. Save water, 2. Prevent water pollution)

Main sources of water pollution:

(1) Industrial pollution (discharge of various wastewater, waste, etc. from industrial production that does not meet standards)

(2) Agricultural pollution (irrational use of chemical fertilizers and pesticides in agriculture)

(3) Domestic pollution (arbitrary discharge of domestic sewage)

1. Water is the most basic component of all living organisms. People must add a certain amount of water every day to maintain the water balance in the body. How much water does an adult need per day under the following circumstances?

(1) Eat food containing about 750ml of water every day, and use about 350ml of water produced by the oxidation of food;

(2) The amount of water eliminated from the body in the form of urine, sweat, exhalation and stool every day is: 1700ml, 500ml, 400ml, 150ml.

The volume of water that needs to be replenished is:

(1700ml+500ml+400ml+150ml)-(750ml+350)

=1650ml

2. According to the on-site report on "World Environment Day" on June 5, 1999: The sweet and clear water from the source of the Yangtze River flows to Haikou, and the underwater visibility is less than 10cm. The main reason is the large inflow of

① Industrial wastewater; ② Domestic sewage; ③ Sediment; ④ Ordinary rainwater ( )

A. ①②③④ B. ①② C. ①③ D. ①②③

1. Do you turn off the faucet when brushing your teeth? ( )

A always B sometimes C never

2. Do you take short showers instead of long showers? ( )

A always B sometimes C never

3. Have you noticed a leaky faucet?

A always B sometimes C never

4. Do you use the toilet as a trash can?

A always B sometimes C never

5. Do you have any water-saving devices in your home?

A has more than 3 B has 1 or 2 C has none

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For more information about the "Source of Life Water Our Water Resources" PPT courseware, please click the "Source of Life Water ppt Our Water Resources ppt" tag.

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Update Time: 2024-10-19

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

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