Answer fast test ! models represent objects in the real world. how do models compare to real-world objects? a. most models are smaller than real-world objects. b. most models are exact copies of real-world objects. c. most models are more complex than the real-world object. d. most models represent a real-world object in a simpler way.

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

What is the polyatamic ion of borate

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 .