Avariety of procedural errors can impact the effectiveness of the copper reaction cycle. comment on the following documented errors: a. when naoh (aq) is added to the cu(no3)2 solution in reaction b, the cu(oh)2 (s) occasionally does not precipitate immediately, and excess naoh must be added. what other substance present in the reaction mixture might preferentially react with the naoh and prevent precipitation of the cu(oh)2? explain.

Which type of stress results when two plates push against one another? a. compression b. tension c. force d. shear

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

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead