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Quiz 3

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MDCAT - Practice Test - Chemistry - Solids Quiz

Attempt 10 MCQs on MDCAT - Practice Test - Chemistry - Solids | Quiz 3

21. What is the sign of lattice energy for an ionic compound?

Negative
Positive
Zero
Variable

22. What factors increase lattice energy?

Increases with charge, decreases with size
Increases with size, decreases with charge
Independent of charge and size
Only depends on temperature

23. Which has higher lattice energy: MgO or NaCl?

MgO
NaCl
KCl
CaO

24. Which equation is used to calculate lattice energy theoretically?

Born-Lande equation
Born-Haber cycle
Kapustinskii equation
Pauling's rules

25. Which cycle is used to experimentally determine lattice energy?

Born-Haber cycle
Hess's law
Gibbs free energy
Van't Hoff equation

26. Approximate lattice energy of NaCl?

-788 kJ/mol
-3795 kJ/mol
-500 kJ/mol
-1000 kJ/mol

27. What are the packing efficiencies of SC, BCC, FCC?

52.4%, 68%, 74%
68%, 74%, 52.4%
74%, 68%, 52.4%
52.4%, 74%, 68%

28. How many atoms per unit cell in SC, BCC, FCC?

1, 2, 4
2, 4, 1
4, 2, 1
1, 4, 2

29. Why are ionic crystals brittle?

Hard and brittle
Soft and malleable
Ductile
Elastic

30. Which defect involves a cation moving to an interstitial site?

Frenkel defect
Schottky defect
Interstitial impurity
Substitutional impurity

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