Download - F.5 Chemistry Acid Rain
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F.5 Chemistry F.5 Chemistry
Acid RainAcid Rain
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Distribution of WorkDistribution of WorkName Student ID Responsibility
Kwok Wan Wan 99086250 -content-technical support
Lui Ching Lam 99243090 -editor-content
Mok Hei Man 99200420 -editor-visual design
Ng Wai Han 99242910 -information search-technical support
Soo May Kei 99200750 -information search-content
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Target audience:Target audience:•F.5 chemistry students•Average ability
Purposes:Purposes:• Introduce acid rain by
lecturing •Provide Q&A section for
evaluation
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WHAT IS ACID RAIN?WHAT IS ACID RAIN?
• Generally, rain water has a pH value of 5.6 because of the carbon dioxide from air dissolved in it
• Any rainfall has a pH value less than 5.6 is defined as acid rain
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• When gas pollutants e.g. sulphur dioxide, nitrogen dioxide dissolve in rain water, various acids are formed.
CO2 + H2O H2CO3 (carbonic acid)SO2 + H2O H2SO3 (sulphorous acid)NO2 + H2O HNO2 (nitrous acid) +
HNO3 (nitric acid)
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CAUSES OF ACID RAINCAUSES OF ACID RAINSO2 : 70% NOx : 30%
X = 1 or 2
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Formation of Formation of Sulphuric AcidSulphuric Acid (H (H22SOSO44))2SO2(g) + O2(g) 2SO3(g)
SO3(g) + H2O(l) H2SO4(aq)
Formation of Formation of Nitric AcidNitric Acid (HNO (HNO33))
2NO(g) + O2(g) 2NO2(g)
4NO2(g) + 2H2O(l) + O2(g) 4HNO3(aq)
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FORMATION OF FORMATION OF ACID RAINACID RAIN
SO2
NOX
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1.Vegetation1.Vegetation• Wash away essential nutrients ions from s
oil• Poor growth of plants
ENVIRONMENTAL ENVIRONMENTAL PROBLEMSPROBLEMS
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2.Aquatic Life2.Aquatic Life
• Inflow of acidic water containing poisonous metal ions
• Kill the fish and water plants
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3. Building3. Building• Acid rain attacks the building materials
and causes corrosion.
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1.What is an acid rain?
2.What is the main air pollutants for the formation of acid rain?
Question and AnswerQuestion and Answer
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3.What is the pH range for the acid rain?
4.What are the major sources of air pollutants?
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5.What is the side effect of acid rain on plants?
6. What is the side effect of acid rain on marine life?
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7. What is the side effect of acid rain on building material?
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On-line ReferencesOn-line References
• http://igc.apc.org/acidrain/
• http://beakman.com/acid/acid.html
• http://qlink.queensu.ca/~4lrm4/
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Answer
1. Acid Rain is rain water with pH value less than 6. This is the rainfall with acidity level beyond what is expected in unpolluted rainfall
2. The main air pollutants are sulphur dioxide and nitrogen dioxide.
SO2 NO2
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Answer
3. The unpolluted rain water is slightly acidic with pH about 5.6 because carbon dioxide in the air dissolves in rain water to form a weak acid. So, the pH of acid rain water is below 5.6.
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4. The major sources were motor vehicles, factories and power stations.
5. Acid rain makes soils become acidic. When the soil becomes acidic, the plant will not grow well.
Answer
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Answer
6. When acid rain runs into rivers or lakes, the pH value of water will goes down below 5. The aquatic life in water may die because of this.
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Answer7. Most building materials made of lime
stone and marble. The acid rain water mainly sulphuric acid will react with calcium carbonate from limestone and marble to form calcium sulphate.
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F.5 Chemistry F.5 Chemistry
Acid RainAcid Rain