343 Exam 1

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62 Terms

1
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T/F. The angular momentum number defines orbital shape.

T

2
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T/F. Dipole-dipole forces are stronger than hydrogen bonds.

F

3
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T/F. Calcium (Ca) is larger in size versus Ca2+

T

4
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T/F. Oxygen always has 16 protons.

F

5
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T/F. The ionic character of a covalent bond is determined by the difference in size of bonding atoms.

F

6
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T/F. Bromine (Br) is larger in size versus bromide (Br-).

F

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T/F. Hydrogen bonding exists between ammonia molecules (NH3).

T

8
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T/F. Ionic bonding is non-directional.

T

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T/F. The % ionic character of C-N bonds is greater than that of C-O bonds.

F

10
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T/F. When the angular momentum number l=2, there are 3 different atomic orbitals.

F

11
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T/F. "Toughness" is the ability of a material to resist deformation.

F

12
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T/F. Deuterium and protium each have 1 proton, thus they are isotopes of hydrogen.

T

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T/F. As the angular momentum number increases, the electron energy increases.

T

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T/F. The 5s orbital fills with electrons before the 4d orbital.

T

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T/F. Polypropylene (PP), a hydrocarbon polymer, will experience London forces between polymer chains.

T

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T/F. Bioactive glasses and glass-ceramics are characterized by a low CaO/P2O5 ratio.

F

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T/F. The stacking sequence of an HCP crystal structure is "ABAB".

T

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T/F. The atomic packing factor of HCP is lower than that of BCC.

F

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T/F. Crosslinked polymers may be "melted and re-shaped".

F

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T/F. For a synthetic polymer sample, as the PDI increases, the difference between the number average molecular weight and the weight average molecular weight decreases.

F

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T/F. The coordination number of FCC is 12.

T

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T/F. The zinc blend (ZnS) crystal structure has a cation coordination number = 6 and an anion coordination number = 6.

F

23
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T/F. Ceramics exhibit covalent bonding.

F

24
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T/F. Both linear and branched polymers can be covalently crosslinked to form thermosetts.

T

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T/F. FCC belongs to the cubic crystal system.

T

26
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T/F. Bioactive glass 45S5 has a melt transition.

F

27
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T/F. Nylon 6,6 is a polyester.

F

28
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T/F. For ceramics, as the coordination number (CN) of the cation increases (an the anion size stays the same), the size of the cation must decrease.

F

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T/F. Miller indices are represented as (h, k, l).

F

30
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T/F. For a ceramic, a cation coordination number of 8 coincides with a cubic coordination geometry.

T

31
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When a biomaterial elicits intentional effects on living tissues, which of the following best describes them?

Bioactive

32
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Crystalline ranges

highly crystalline: 90-70% semi-crystalline: 80-20% amorphous: 0% crystalline: 100%

33
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Polydispersity Index (PDI) Equation

Mw/Mn, PDI > 1 (always)

34
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Tm ___ Tg

Tm > Tg (always, unless no Tm)

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Tg definition

Temperature at which there is an increase in segment mobility of the polymer backbone

36
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Why are some polymers biodegradable

Hydrophilic ester groups experience hydrolysis and break bonds

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Why are some polymers with esters not biodegradable

Large aromatic carbons

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Biodegradable polymers

PGA PLLA PDLLA PDS PCL

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Highly crystalline polymers

HDPE Isotactic PP Isotactic PS PTFE

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Amorphous polymers

Atactic PP Atactic PS PMMA PHEMA PC PDLLA

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Si-O bonds % ionic character

51%

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Fluorite (CaF2) A and X CN

A: 8 X: 4

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Zinc Blend (ZnS) A and X CN

A: 4 X: 4 Td coordination geometry

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Cesium Chloride (CsCl) A and X CN

A: 8 X: 8 cubic coordination geometry

45
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Rock Salt (NaCl) A and X CN

A: 6 X: 6 Oh coordination geometry

46
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Linear coordination geometry CN

2

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Triangular coordination geometry CN

3

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Td coordination geometry CN

4

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Oh coordination geometry CN

6

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Cubic coordination geometry CN

8

51
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crystallographic plane (Miller indices)

( h k l )

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crystallographic directions

[ u v w ]

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point coordinates

q r s

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HCP APF

0.74, close packed

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HCP CN

12

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Number of atoms in 1 HCP unit cell

6

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BCC APF

0.68

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BCC CN

8

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Number of atoms in 1 BCC unit cell

2

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FCC APF

0.74, close packed

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FCC CN

12

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Number of atoms in 1 FCC unit cell

4