Descriptive Inorganic Chemistry (Exam 2) With 100% Correct Answers 2024

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 are "s" electrons -Low melting points (all of them) What causes group 12 pseudo-transition metals to have a low mp? - answerLow heat of atomization which causes weak intermetallic forces Mercury's low mp is do to ____. - answerRelativistic 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? - answerIt stands for Hydra-argyrum (liquid silver) Group 12 n-1 d electrons are ___. What does this cause? - answer-inert -a maximum oxidation state of +2 Hg+ _____ - answerdoes not exist (at least like this) Mercury (I) exists like this _____ - answerHg2+2 Zinc and Cadium are both ___. - answerreactive Zn+2HX--> - answerZnX₂+H₂ Zn+X₂-Δ-> - answerZnX₂ Zn and Cd both form ___ when exposed to air. This is called ____ - answer-oxides -passivation What is the principle source for zinc extraction? - answerZnS (sphalerite or zinc blend) Show the extraction process for Zinc. How is the final zinc cooled? - answerZnS+3O2-800C- >2ZnO+2SO2 (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? - answerGalvanizing. its an anti corrosion coating for iron. How does galvanizing work. - answerZn-->Zn2++2e- what are the standard potentials for Zn2+ and Fe2+ respectivily - answer(-)0.76V (-)0.44V Most zinc salts are ___ soluble. - answerwater The following rxn is almost right Zn(NO3)2-(H₂O)-> - answerZn2++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 acidic 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 - answerhydrate What are the uses of zinc chloride? - answer-flux in soldering This is done by removing the surface oxide