A rollercoaster is not moving and has 50,000 J of GPE at the top of a hill. How much GPE will it have halfway down the hill? O A. 25,000
B. 50,000
C. 40,000 J
OD. 30,000 J

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 .

Is the idea of spontaneous generation supported by redi's experiment? justify your answer in 2-3 sentences?

Can someone me out on this question for my national 5 chemistry homework