If water is too warm, there may not be enough oxygen in it. When there are too many bacteria or aquatic animal in the area, they may overpopulate, using DO in great amounts. Oxygen levels also can be reduced through overfertilization of water plants by run-off from farm fields containing...
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Fish ___ oxygen through their gills(鳃). III.单项填空: () 1. Air pollution can affect humans by___ sore eyes and respiratory problems, especially in children and___. A. cause, the old B. causing, the older C. causing, the elderly D. cause, the elderly ()...
Many substances that are said to dissolve are actually soluble and breakdown and combine with other substances. One of the most common examples of this reaction is when salt dissolves in water. Why does salt dissolve in water? Salt is a soluble solid that will breakdown when combined with ...
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Why are most phenols only slightly soluble in water? What characteristics improve the solubility of molecules in water? Explain why some substances dissolve in water while other substances do not. Give examples. Water is said to be a good solvent because of what factor? Why does water boil at...
—Because trees (产生) a lot of oxygen(氧气). 相关知识点: 试题来源: 解析 produce 【详解】 句意:——森林里面的空气为何如此清新?——因为树木产生大量的氧气。根据汉语提示可知,对应的英文表达是produce,动词,意为“产生”;根据“Why is...”可知,使用一般现在时;主语trees是复数,因此谓语动词用原形。...
Why does oxygen have such a low solubility in water? Why are carbon dioxide concentrations expected to increase? Why does the solubility of gases decrease with increased temperature? Why is methane a stronger greenhouse gas than carbon dioxide? Why is amylopectin less soluble? What is the reason...
13.W: Would you like a cup of tea or a glass of water, Tom? M: Neither. I’d like a glass of milk. Q: What would Tom like? 14.W: Look! Peter is in front of Eddie. Oh, he is the first now. M: Let’s give him cheers. Q: What match are they watching?...
Why is acetophenone non-polar? Explain why you can dissolve Ni(OH)2 in aqueous ammonia. Why doesn't sulphur dioxide directly dissolve in water? Why is SiH_4 non polar? Why is the solubility of oxygen lower in water? Explain why Tetrahydrofuran is soluble in water but hexanes is not?