(a)
Interpretation:
The two ideas that might help us keep water clean have to be provided.
Concept introduction:
Water pollution: It can be defined as alternation in physical, chemical and biological characteristics of water through natural or human activities and making it unsuitable for its designated use.
Fresh water present on the earth surface is put to many uses, it used for drinking, domestic and municipal use agricultural, irrigation, and navigation. The used water becomes contaminated and is called as waste water.
(b)
Interpretation:
- The importance of global water issue has to be identified.
- The two factors that make the global water issue as important have to be suggested.
- The two ways in which people currently are addressing this issue have to be named.
Concept introduction:
Water pollution: It can be defined as alternation in physical, chemical and biological characteristics of water through natural or human activities and making it unsuitable for its designated use.
Water treatment: when effluent discharged into a river body such as lake, river or sea a number of process occur like physical, chemical and biological characteristics of water change which causes loss of organism.
The extent of damage depend upon type of pollutant present in effluent, non-bio degradable pollutant like mercury are most deadly as they accumulate in aquatic organism which lead to bio magnifications.
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Chemistry In Context
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- Water pollution is defined only as any physical or chemical change in water that: 1 a. Improves the flow rate of ground water b. Adds good properties to drinking water c. Improves the health of humans and other organisms. d. Adversely affects the health of humans and other living organisms. 03 + NOx + HCs ===> 2 a. VOC b. Smog c. CFCS d. CO2 Which one of the following is not true: 3. a. Sediments destroy organisms life in water. b. Sediments cover aquatic animals and plants. c. Sediments remove insoluble toxins from lakes. d. Sediments decrease light penetration. light at about 120-210 nm + O2 produces: a. 20 b. CIO C. 03 d. H20 One serious environmental problem is: a. Eutrophication b. Increase in DO c. Disinfection d. Decrease in BOD Gasoline motor vehicles are the major source of: 6 a. 03 on earth b. NOx on earth c. CFC's d. NH3 on eartharrow_forwardWhat chemical properties can be used to model environmental harm? What is bioaccumulation? Select one: a. Build-up of a chemical in an organism. b. Build-up of a chemical in an organism by ingesting the chemical through water only. C. Build-up of a chemical in a food chain. d. Build-up of a chemical in the environment (since the chemical cannot degrade in through normal environmental processes).arrow_forward1-What do you already do to use less water and pollute water less? 2/Are there any DIFFERENT, new actions you can commit to? Think of simple things you can do on a regular basis. It is not helpful if you cannot do it regularly. Small steps are important too. Any action you take matters.arrow_forward
- Why do we need to conserve water? A. It is a non-renewable source B. It is unlimited c. It is limited D. It is renewable sourcearrow_forwardWhat is the difference between dissolved oxygen and oxygen in air? Why is D.O. an important measurement of an aquatic ecosystem?arrow_forwardWhy is such a small amount of freshwater available for humans to readily use? * Most of fresh water is frozen in glaciers and polar ice caps Most of freshwater found in the gas form in the atmosphere Most of freshwater is liquid in lakes, rivers , & aquifers Majority of freshwater is mixed in with the ocean waterarrow_forward
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