Catalytic converters on automobiles use the metals rhodium and platinum as catalysts to convert harmful gases to carbon dioxide, nitrogen, and water. which answer best explains why rhodium and platinum do not have to be continuously replaced in the system? (1 point) 1.) the useable life of the metals is longer than the life of the automobile. 2.) the metals speed up the reactions but are not used up in the reaction. 3.) the metals are too expensive to be replacing constantly. 4.) the metals are inhibitors in the reaction process and are in chemical equilibrium.

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Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

What is the percentage of hydrogen in c2h4