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22 a student collected the following data when doing

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22. A student collected the following data when doing a biochemical oxygen demandtest on four samples of water from a river.DISSOLVED OXYGEN CONCENTRATIONSample ISample IISample IIISample IVStart10 mg/L9.0 mg/L10 mg/L6.0 mg/LEnd7.0 mg/L8.0 mg/L9.0 mg/L3.0 mg/LBased on the data, which sample is most likely obtained from river water upstream ofall major cities?A.Sample IB.Sample IIC.Sample IIID.Sample IV
25.The effect on indoor air quality of off-gassing from new synthetic building materials is a concernbecause of the release of
30.2,4-D is the active ingredient in many broad-leaf herbicides. The carboxylic acidform of 2,4-D is as shown in the following diagram.
a.The ester forms of this herbicide are also effective. Draw the 2,4-D ester thatwould be produced when 2,4-D reacts with ethanol.b.The esters of 2, 4-D are particularly effective against woody plants onpastureland but may be more toxic for birds. For birds, the acidic form of 2, 4-Dhas an LD50equal to approximately 500 mg/kg. Assume the esters of 2, 4-D aremore toxic for birds. Indicate whether the LD50of the ester form for birds will benumerically higher or lower than the acidic form. Explain your answer.31.Explain why pesticides should not be used over an extended period of time.+
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pH, Carboxylic acid

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