Helen is testing to see if substances are soluble or insoluble. She puts two difference substances in a jug of water and stirs them. Substance 1: This makes the water cloudy, but the water eventually becomes clear. Substance 2: This substance does not change its shape in the water and floats at the top. Which statement is true?  Substance 1 is soluble, and Substance 2 is insoluble. Substance 1 is insoluble, and Substance 2 is soluble. Both substances are insoluble. Both substances are soluble.

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

What are the two largest greenhouse gases

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 .