Why do polar bears have a thick layer of fat?
It helps them find prey.
It helps them stay warm.
It helps them hide from predators.
It helps them float in ocean water.

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.

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 .