20. Suppose you have a 1:1:1 by weight mixture of three solid compounds, salicylic acid + 4-nitroaniline + naphthalene. You dissolve 1 gram of this mixture in diethyl ether, and spot the solution on a TLC plate. After the plate is developed, you see three spots. You then extract the ether solution with strong aqueous base and once again place a tiny drop of the ether solution on a TLC plate. Which spot(s) would disappear?

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

Nonpoint source pollution is difficult to control because it

|using the periodic tablewarm-upuse the periodic table in the tools bar to answer the following questions.what elemental classification does oxygen belongto? done