A modern automobile engine creates various harmful gasses. Still, much of the emissions end up being harmless—especially once the car has been running for about five minutes on a temperate day. Attached to a car's exhaust pipe is a device consisting of platinum and palladium-coated onto a ceramic surface (beads or a honeycomb shape). What would you guess is going on here? Why might the device only work well after a car has been running for a while? Assess how you think factors such as temperature, concentration, and the presence of a catalyst affect the rate of a chemical reaction in this scenario.

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 .