Descriptive Inorganic Chemistry (Exam 2) With 100% Correct Answers 2024
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Course
Inorganic chemistry
Institution
Inorganic Chemistry
Descriptive Inorganic Chemistry (Exam 2)
With 100% Correct Answers 2024
What are the group 12 metals called? - answerPseudo-Transition metals
Tell of four characteristics of Group 12 metals - answer-not like the other transition metals
-resemble group 2 or group 14 elements
-Valence electrons ...
Descriptive Inorganic Chemistry (Exam 2) With 100% Correct Answers 2024 What are the group 12 metals called? - answer✔✔Pseudo -Transition metals Tell of four characteristics of Group 12 metals - answer✔✔-not like the other transition metals -resemble group 2 or group 14 elements -Valence electrons are "s" electrons -Low melting points (all of them) What causes group 12 pseudo -transition metals to h ave a low mp? - answer✔✔Low heat of atomization which causes weak intermetallic forces Mercury's low mp is do to ____. - answer✔✔Relativistic effects What causes and accompanies the relativistic effects on Hg? - answer✔✔-its full 4f sub shell which shields poorly. -Contraction of the 6s orbital which prevents intermetallic forces. why is Hg the symbol for mercury? - answer✔✔It stands for Hydra -argyrum (liquid silver) Group 12 n -1 d electrons are ___. What does this cause? - answer✔✔-inert -a maximum oxida tion state of +2 Hg+ _____ - answer✔✔does not exist (at least like this) Mercury (I) exists like this _____ - answer✔✔Hg2+2 Zinc and Cadium are both ___. - answer✔✔reactive Zn+2HX --> - answer✔✔ZnX₂+H₂ Zn+X ₂-Δ-> - answer✔✔ZnX₂ Zn and Cd both form ___ when e xposed to air. This is called ____ - answer✔✔-oxides -passivation What is the principle source for zinc extraction? - answer✔✔ZnS (sphalerite or zinc blend) Show the extraction process for Zinc. How is the final zinc cooled? - answer✔✔ZnS+3O2 -800C -
>2ZnO+2 SO2 (step 1 roasting) ZnO+C -800C ->Zn+CO (step 2 cola treatment) -by spraying the Zn vapor w/ molten lead. The solid zinc floats on top when its cool what is a use for zinc? - answer✔✔Galvanizing. its an anti corrosion coating for iron. How does galvanizing work. - answer✔✔Zn-->Zn2++2e - what are the standard potentials for Zn2+ and Fe2+ respectivily - answer✔✔(-)0.76V (-)0.44V Most zinc salts are ___ soluble. - answer✔✔water The following rxn is almost right Zn(NO3)2 -(H₂O)-> - answer✔✔Zn2++2NO3 - The [Zn(OH2)6]2+ ion is formed and 2[NO3 -] never gets protonated Show how the [Zn(OH2)6]2+ ion reacts with water. How does it behave? - answer✔✔[Zn(OH2)6]2++H2O< -->H3O++[Zn(OH2)5(OH)]+ The ion behaves as a weak acid and the resulting solution is a cidic Show how the [Zn(OH2)6]2+ ion reacts with hydroxide. Add excess hydroxide then add ammonia - answer✔✔[Zn(OH2)6]2++2OH - -->Zn(OH)2+6H2O Zn(OH)2+xsOH - -->[Zn(OH)4]2 - [Zn(OH)4]2 - +4NH3 -->[Zn(NH3)4]2++4OH - Zinc Chloride can be a ____ in the solid state - answer✔✔hydrate What are the uses of zinc chloride? - answer✔✔-flux in soldering This is done by removing the surface oxide since melted ZnCl2 removes oxygen from surface of other metal.
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