Environmental Management - 0680 CIE

Acid Rain

Gbogbo ọrọ náà

Rain is meant to clean the air, but when we burn fuels that contain sulfur, and run engines hot enough to make the nitrogen in the air react, the rain itself turns sour. Sulfur dioxide and oxides of nitrogen drift up into the clouds, react with oxygen and water vapour, and come back down as weak sulfuric and nitric acids. Carried on the wind, this acid rain can fall hundreds of kilometres from the chimney or exhaust that produced it, which is why it is a problem that crosses borders.

In this lesson you will learn exactly how acid rain forms, from the gases at the source to the acids that fall to Earth. You will study its effects on lakes and the fish in them, on soils, crops and forests, and on the very stone of our buildings. Finally you will examine the strategies used to manage it, from cleaning the gases leaving a power station to fitting catalytic converters to cars, and learn to weigh their benefits against their limitations.

Ebumnobi

4.3.1 Describe the formation of acid rain, limited to: (a) sulfur dioxide from combustion of fossil fuels which contain sulfur compounds (b) sulfur dioxide from volcanic gases (c) oxides of nitrogen when nitrogen from the atmosphere reacts with oxygen in the high temperature of vehicle engines (d) sulfur dioxide and oxides of nitrogen react with oxygen and water vapour in the atmosphere to form acid rain.
4.3.2 Describe the impacts of acid rain, limited to: (a) acidification of bodies of water (b) reduced fish populations (c) effect on aquatic food webs (d) acidification of soils (e) damage to crops and vegetation: plant defoliation and reduced crop yields (f) damage to buildings.
4.3.3 Describe strategies to manage the impacts of acid rain, limited to: (a) flue-gas desulfurisation to remove sulfur dioxide by reacting with calcium carbonate or calcium oxide (b) catalytic converters to remove oxides of nitrogen (c) transport policies.
4.3.4 Discuss the benefits and limitations of strategies to manage the impacts of acid rain.

Akọmọ Ojú-ẹkọ

Acid rain links a simple piece of chemistry to real damage you can see: dead fish in mountain lakes, bare patches in forests, crumbling statues and weathered buildings. It is also a success story, because where countries have cut sulfur emissions, the rain has grown cleaner. Understanding the cause, the chemistry and the cure shows you how a pollution problem can be diagnosed and solved, which is exactly the kind of reasoning the exam rewards.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Acid Rain. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

Which two gases are the main cause of acid rain? A. Carbon dioxide and methane B. Sulfur dioxide and oxides of nitrogen C. Oxygen and nitrogen D. CFCs and ozone Answer: B
Oxides of nitrogen that contribute to acid rain are mainly formed: A. In the high temperatures of vehicle engines B. By photosynthesis in plants C. When CFCs break down D. In flooded rice fields Answer: A
Which acids are formed when acid rain gases react in the atmosphere? A. Hydrochloric and carbonic acids B. Sulfuric and nitric acids C. Ethanoic and citric acids D. Phosphoric and boric acids Answer: B
Flue-gas desulfurisation reduces acid rain by removing: A. Oxides of nitrogen from car exhausts B. Carbon dioxide from the air C. Sulfur dioxide from power-station gases D. Ozone from the stratosphere Answer: C
Which of these is an impact of acid rain? A. A larger ozone hole B. Acidification of lakes and rivers C. Higher levels of argon in the air D. Cooling of the oceans Answer: B