Quiz 2 (ch 4 and 5)

Question 1

singly bonded carbon atom to 4 other atoms

Answer 1

Saturated Hydrocarbons

Question 2

Double or triple bonded carbon atoms

Answer 2

Unsaturated hydrocarbons

Question 3

hydrocarbon atoms with the same compositions

Answer 3

isomerism

Question 4

Process of forming solid polyethylene

Answer 4

gas at atmospheric Temp and Pressure

Question 5

average number of repeated units in a polymer

Answer 5

Degree of Polymerization

Question 6

Molecular weight increase will also increase:

Answer 6

melt viscosity, tensile strength, and impact resistance

Question 7

The physical properties of polymers depend on:

Answer 7

Molecular weight, molecular shape, and structure of molecular chains

Question 8

How do you change molecular configurations?

Answer 8

break bonds

Question 9

2 categories of isomerism

Answer 9

stereoisomerism and geometrical isomerism

Question 10

all R groups on the same side

Answer 10

isostatic

Question 11

R group alternate sides

Answer 11

syndiotactic

Question 12

R groups randomly positioned

Answer 12

Atactic

Question 13

h atom and CH3 group on the same side

Answer 13

Cis

Question 14

H atom and CH3 group on opposite sides

Answer 14

Trans

Question 15

Soft when heated, hard when cold; heat allows secondary bonds to break, primarily linear

Answer 15

Thermoplastic

Question 16

During initial heating material is permanently set; cross links are formed that prevent molecular motion, harder, stronger, and brittle

Answer 16

Thermosetting

Question 17

4 groups of copolymers

Answer 17

Random, alternating, block, and gaft

Question 18

polymer with chain folds at the faces

Answer 18

polymer crystallinity

Question 19

The degree of crystallinity is determined by:

Answer 19

The rate of cooling during soldification

Question 20

Main goal of materials science engineering:

Answer 20

to control the defects to better manipulate materials

Question 21

Process of adding defects manually to improve material

Answer 21

Soldification

Question 22

Anything that disrupts the regular crystalline structure

Answer 22

Micro-defects

Question 23

Two categories of point defects in solids

Answer 23

vacancies and self interstitials

Question 24

Location in solid structure that indicate an absence of atom

Answer 24

vacancy

Question 25

Location in solid structure where the is an inserted atom that seems unnatural and tends to be larger or smaller than base atom

Answer 25

Self interstitial

Question 26

foreign atoms present within an atom

Answer 26

impurities

Question 27

Most metals are what?

Answer 27

alloys

Question 28

when the parent metal is replaced by atoms of the alloying metal

Answer 28

substitutional solid solution

Question 29

Atoms of the parent or solvent metal are larger than the atoms of the alloying metal

Answer 29

interstitial solid solution

Question 30

Maximum concentration of carbon to form a solid solution

Answer 30

2%

Question 31

Possible for cations and anions in ceramics

Answer 31

vacancies

Question 32

Possible for only cations due to anions being much larger in nature

Answer 32

Interstitials

Question 33

When a cation vacancy and cation interstitial pair exist

Answer 33

Frankel Defect

Question 34

When a cation vacancy and an anion vacancy pair exist

Answer 34

Shottky defect

Question 35

What must be balanced in order for a solid solution when impurities are present

Answer 35

electronegativity

Question 36

Antimony atom surrounded by covalent bonded silicon; free electron

Answer 36

N-type Semiconductor

Question 37

Boron atom surrounded by 4 silicon atoms (covalent bonds) with a hole in of the shells

Answer 37

P-type Semiconductor