acording to the hertzsprung russell a star with a very high luminosity and a tempeture of around 9000 k is most likely which type of star

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

What produces wave a)sound b) heats c)transfer of energy d)vibrations

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 .