One measure of the organic content of wateris chemical oxygen demand (COD). In the COD test, organic matter is oxidized with dichromate, Cr2O72-, at low pH to CO2and the dichromate is reduced to Cr 3.Write the balanced overall reaction for the oxidation of ethanol (CH3CH2OH) in the COD test.

It is important to wear proper protective equipment in lab even when not actively performing experiments because accidents can affect any researcher, even one not working on an experiment. select the best answer from the choices provided

Butadiene undergoes a reaction at a certain temperature in the gas phase as follows: 2c4h6(g) --> c8h12(g) the following data were collected for this reaction: time (min) [c4h6] (m) 0 0.36 15 0.30 30 0.25 48 0.19 75 0. determine the order of the reaction and the rate constant. 1st order and k = 4.3x10 -4 s-1 1st order and k = 2.3x10-4 s-1 2nd order and k = 4.3x10-4 s-1 2nd order and k = 2.3x10-4 s-1 zero and k = 4.3x10-4 s-1

Name the element in group 17, period 2. (periodic table)