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GRE Chemistry Inorganic

Instructions:

Answer 26 questions in 15 minutes.
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Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. p-n junction
An atom is missing from its usual site
An atom has been displaced to another site
Allows AC to be converted to DC
4/sqrt(3) * r

2. Conduction band
An atom has been displaced to another site
Use low amount of current to regulate large amount
A
Unfully occupied orbital - potentially overlapping

3. Alkali metals
# of atoms of a ligand attached to a metal atom
Insulator which is doped with other elements
Contain freely moving electrons
Recovered by electrolysis of molten salt

4. Frenkel defect
Insulator which is doped with other elements
An atom has been displaced to another site
Role of Lewis base in coordination chemistry
4/sqrt(2) * r

5. Closo-; nido-; arachno- boranes
N=n; n+4; n+6
(1.33x10^-13)* ³v(A)
4/sqrt(2) * r
Forms ammonia from nitrogen

6. Schottky defect
An atom is missing from its usual site
Recovered by electrolysis of molten salt
Z
Excess electrons form a donor band close in energy to the conduction band

7. Nuclear Radius
An atom has been displaced to another site
(1.33x10^-13)* ³v(A)
N=n; n+4; n+6
Insulator which is doped with other elements

8. L.bcc
Role of Lewis base in coordination chemistry
4/sqrt(3) * r
Excess electrons form a donor band close in energy to the conduction band
Contain freely moving electrons

9. Hapticity
4/sqrt(3) * r
# of atoms of a ligand attached to a metal atom
Magnetic moment = v(n*(n+2))
Determined by synthetic conditions

10. Larger difference in atomic radii
Allows AC to be converted to DC
Determined by synthetic conditions
An atom is missing from its usual site
More soluble

11. Ferrous
Fe(II)
Recovered by electrolysis of molten salt
Insulator which is doped with other elements
Unfully occupied orbital - potentially overlapping

12. Ligand / chelator
Determined by thermodynamics (Increased entropy)
Role of Lewis base in coordination chemistry
Unfully occupied orbital - potentially overlapping
(1.33x10^-13)* ³v(A)

13. Cobalamin
Insulator which is doped with other elements
Forms ammonia from nitrogen
Unfully occupied orbital - potentially overlapping
Involved in biological methyl transfer

14. p-type conductivity
Electron holes are formed by promotion of valence band electrons to the acceptor band
Z
(1.33x10^-13)* ³v(A)
Role of Lewis base in coordination chemistry

15. Atomic Number
Excess electrons form a donor band close in energy to the conduction band
Contain freely moving electrons
A
Z

16. Paramagnetism
Excess electrons form a donor band close in energy to the conduction band
Magnetic moment = v(n*(n+2))
An atom has been displaced to another site
Unfully occupied orbital - potentially overlapping

17. Haber Process
4/sqrt(2) * r
More soluble
Excess electrons form a donor band close in energy to the conduction band
Forms ammonia from nitrogen

18. Semiconductor
Determined by thermodynamics (Increased entropy)
Conductivity increases with T
An atom is missing from its usual site
4/sqrt(2) * r

19. Valence Band
More soluble
Contain freely moving electrons
Allows AC to be converted to DC
Determined by thermodynamics (Increased entropy)

20. n-type conductivity
Excess electrons form a donor band close in energy to the conduction band
Determined by synthetic conditions
Insulator which is doped with other elements
Recovered by electrolysis of molten salt

21. Intrinsic defect
More soluble
An atom is missing from its usual site
Determined by thermodynamics (Increased entropy)
Electron holes are formed by promotion of valence band electrons to the acceptor band

22. Extrinsic semiconductor
Conductivity increases with T
Insulator which is doped with other elements
Z
Excess electrons form a donor band close in energy to the conduction band

23. L.fcc
4/sqrt(2) * r
Unfully occupied orbital - potentially overlapping
Conductivity increases with T
More soluble

24. Mass Number
Unfully occupied orbital - potentially overlapping
Forms ammonia from nitrogen
A
Fe(II)

25. Transistor
Conductivity increases with T
Involved in biological methyl transfer
Excess electrons form a donor band close in energy to the conduction band
Use low amount of current to regulate large amount

26. Extrinsic defect
An atom is missing from its usual site
Determined by synthetic conditions
Role of Lewis base in coordination chemistry
# of atoms of a ligand attached to a metal atom

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GRE Chemistry Inorganic

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