Chemistry, 11.04.2020 00:53 watervliet2586
You are asked to test the biochemical oxygen demand of a stream in your town. After observing the BOD over a week, you calculate that the water has a BOD of 150 mg of oxygen, which is a relatively high level. This leads you to conclude that
A. the water has a high level of oxygen
B. The water is likely contaminated with high levels of pollution or waste
C. the water quality is safe for most aquatic organisms
D. The high level of oxygen demand is likely caused y natural decomposition
E. The water is safe for drinking
Answers: 3
Chemistry, 22.06.2019 15:30, alaf05160
Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what most likelyhappened? energy was created inside the blocks. energy was destroyed inside the blocks. energy was absorbed into the blocks from outside the system. energy was transferred from the warmer block to the cooler block.
Answers: 2
Chemistry, 23.06.2019 00:20, destromero
Which diagram represents the phase tha occurs after a solid melts?
Answers: 1
You are asked to test the biochemical oxygen demand of a stream in your town. After observing the BO...
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