When washing the solids after the reaction with zinc metal, what are you removing? Choose... (5pts) Based upon the percent yield you calculated, what is one source of error, and the resulting of that error in your experiment. Select the option corresponding to the following choices When decanting, some solid was lost, resulting in less copper recovered and a lower % yield When decanting, some solid was lost, resulting in more copper recovered and a higher % yield When drying over the steam bath, did not let the sample dry completely, resulting in a higher mass of copper recovered, and a higher % yield. When drying over the steam bath, did not let the sample dry completely, resulting in a lower mass of copper recovered, and a lower % yield.

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

Express the following number in scientific notation. 0.026890 =

Rank the four gases (air, exhaled air, gas produced from from decomposition of h2o2, gas from decomposition of nahco3) in order of increasing concentration of co2