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Originally Posted by ahsley
hey i have a question,
a shiny malleable substance(metal), which is an excellent conductor of electricity, is burned in air to produce a white solid(y). when this solid is placed in water, it slowly dissolves to form a colourless solution(z)
-what kind of substance is y?
-what kind of substance is z?
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My best guess at this point is still magnesium. This site says that it's a shiny and soft metal:
http://www.chemsoc.org/viselements/p...sium_data.html
The periodic table on this site says that when it is burned in air (and it does burn in air quite brightly) MgO and Mg3N2 are formed. Generally, to burn something in air means to react it with oxygen gas to form the oxide.
This site says that MgO is a white solid:
http://www.magspecialties.com/students.htm
This site says that when MgO is place in water, it becomes milk of magnesia, the chemical formula of which is Mg(OH)2:
http://hyperphysics.phy-astr.gsu.edu...pertab/mg.html
As a metal, magnesium will be a good conductor of electricity.
Therefore x=Mg, y=MgO, and z=Mg(OH)2 (aq), I think.