Noble gases (18): (name all noble gases) • these elements do not easily combine with other elements. they are odorless, colorless and therefore were difficult to discover. • when air is cold, oxygen liquefies first at -18o celsius. about 1% of the air is still gas composed of the noble gas entire noble gas short version of noble gas • one noble gas was discovered on the sun. it’s spectrum was identify first. this is • one of noble gas is radioactive and seeps up your basement floors and walls. it is • this noble gas is used in electronic flashes and other bright lights. it is• this noble gas is best known for its orange color in gas discharge tubes. it is used for signs that bear its name. it is

What is the mass of 8 moles of sodium atoms

In pqr m< p=60 m< q= 30 and m

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 .