PLEASE HELPP FASTTT 20. Alan wants to know whether an electric field surrounds his television. He places a ball with a negative charge 10 cm away from
the screen. The ball moves 1 cm away from the screen. Alan concludes that his television has no electric field because the ball was not
attracted to it.
Write a paragraph explaining whether you agree with Alan's conclusion. Your paragraph should answer the following questions:
• Can Alan's experimental design provide him the answer to his question? Why or why not?
• Do you agree with Alan? Why or why not?
• What evidence could Alan use to show the effect of an electric field on charged objects?

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .

Describe the basic structure of the atom

Solid tin exists in two forms: white and gray. for the transformation sn(s, white) → sn(s, gray) the enthalpy change is -2.1 kj/mol and the entropy change is -7.4 j/(mol*k). a. calculate the gibbs free energy change for the conversion of 1.00 mol white tin to gray tin at -30℃. b. will white tin convert spontaneously to gray tin at -30℃? c. at what temperature are white and gray tin thermodynamically equivalent at a pressure of 1 atm?