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GLY 3202 C - Module 3 Quiz Questions And Answers Already Graded A+
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a cation is bonded with 8 anions. what is the shape of the volume enclosed by the surrounding anions (coordination polyhedron)? - ️️cube what are crystallographic axes? - ️️Three of four lines parallel to the major lattice planes whose origin lies in the center of the crystal. what are ...

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  • November 12, 2024
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  • 2024/2025
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GLY 3202 C - Module 3 Quiz
a cation is bonded with 8 anions. what is the shape of the volume enclosed by the
surrounding anions (coordination polyhedron)? - ✔️✔️cube

what are crystallographic axes? - ✔️✔️Three of four lines parallel to the major lattice
planes whose origin lies in the center of the crystal.

what are the building blocks of minerals? - ✔️✔️ions

what is a cation? - ✔️✔️an atom that has lost at least one electron.

this is a ball and stick representation of a silica tetrahedron. which ion represents O?

A (red ball on top of the central cation)
B (white ball in the center) - ✔️✔️A

which of these statements accurately describes the properties of the ionic radius? -
✔️✔️the ionic radius varies with charge and coordination

how would you describe the relationship between anions and cations in silicates? -
✔️✔️ionic radius of anions is usually bigger than cations.

given the radius of Al as 0.53 and O as 1.26 what coordination polyhedron would you
predict using the following table?

divide 0.53/1.26 = radius ratio range 0.414-0.732 - ✔️✔️octahedron

what is the electrostatic valence bond strength for AL +3 in 6-fold coordination with O2-
- ✔️✔️0.5

which bond will be the hardest to break? (ca2+,si4+,al3+,o2-) - ✔️✔️Si-O in 4-fold
coordination

how are mineral formulae constructed? - ✔️✔️in order of decreasing coordination
number

how many Ca ions are required to balance the mineral formula:
CaxMg4Al(AlSi7)O22(OH)2?

valence states: Ca 2+, Mg 2+, Al 3+, Si4+, O2-, H+ - ✔️✔️2

, what are the two basic parameters that determine ease of substitution of cations in an
atomic structure? (Select 2)

-cation shape
-cation charge
-cation size
-cation mass - ✔️✔️cation charge ; cation size

complete solid solution is limited to certain temperatures and pressures in feldspars
where Na is substituting for K. why is this solid solution restricted? - ✔️✔️Because K is
a different size to Na

which of these mineral formulae contain coupled substitutions. Fe is 2+ unless specified
otherwise. (select all that apply)

-(Na, Ca)(Fe3+,Fe2+,Mg)Si2O6
-(Mg,Fe,Ca)2(Mg,Fe)5Si8O22(OH)2
-Ca2(Mg,Fe)5Si8O22(OH)2
-(Mg,Fe)2SiO4
-SiO2
-NaFe3+Si2O6
-NaCl - ✔️✔️(Na, Ca)(Fe3+, Fe2+,Mg)Si2O6

which one of the following is electrically neutral? - ✔️✔️atom

given that potassium has an atomic no.19 and 4 electron shells with the following
configuration for the first 3 shells:

shell 1: 2
shell 2: 8
shell 3: 8

what charge does K have when it bonds with other elements? - ✔️✔️1+

which type of bonding involves sharing electrons between individual atoms? -
✔️✔️covalent

which type of bonding does not involve the sharing or exchange of electrons? -
✔️✔️van der waals

why do atoms bond? - ✔️✔️because they are most stable when they achieve a full
outer shell of electrons.

in which mineral do van der waals forces (bonds) form an important part of the crystal
structure? - ✔️✔️muscovite mica

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