Materials Final Review Summer

п»їMaterials Last Review (TESTS I, 2, & III)

Part I actually: Multiple Decision

1) As the temperature of your polymer improves, its thickness

a. Increases

b. Lessens

c. Is still fairly constant

2) Which one from the three plastic types does not involve cross-linking: a. Elastomers

b. Thermoplastics

c. Thermosets

3) Degree of polymerization is which in the following:

a. Average quantity of mers inside the molecule string

m. Proportion with the monomer that has been polymerized

c. Quantity of the molecule weights with the mers inside the molecule

d. None of the over

4) A branched molecular structure is stronger in the sound state and more viscous inside the molten express than a geradlinig structure for the similar polymer a. True

b. False

5) Copolymers work best described by which one of the following a. Mixtures of two several polymer types

w. Polymers that includes a mixture of crystallized and flitting phases c. Polymers whose molecules are created from repeating devices of two different types g. Two parallel linear polymer chains which might be cross-linked

6) Because the degree of crystallinity in a presented polymer boosts, the polymer becomes denser and stiffer, and its burning temperature lessens: a. Accurate

w. False

7) While the heat of a polymer bonded increases, their density:

a. Improves

w. Decreases

c. Remains to be fairly frequent

8) How a large number of atoms are there in the BCC unit cell

a. 8

m. 9

c. 10

deb. 12

elizabeth. 14

farrenheit. 17

9) How a large number of atoms are available in the FCC unit cell:

a. almost 8

b. on the lookout for

c. 10

d. 12

e. 14

f. 17

10) Just how many atoms are there in the HCP device cell:

a. eight

b. 9

c. 15

d. doze

e. 14

f. 17

11) Alloys are seen as which one of the following developing types: a. Adhesive

b. Covalent

c. Hydrogen

d. Ionic

electronic. Metallic

f. Van der Waals

12) Ceramics happen to be characterized by the pair of the next bonding types: a. Backing

w. Covalent

c. Hydrogen

g. Ionic

e. Metallic

n. Van dieser Waals

13) Polymers are seen as which two with the following connecting types: a. Adhesive

b. Covalent

c. Hydrogen

d. Ionic

at the. Metallic

f. Van der Waals

14) In general, alloys are seen as which in the following properties (three greatest answers): a. Brittleness

b. Chemical inertness

c. Electrically insulating

d. Substantial electrical conductivity

e. High solidity

f. High energy conductivity

g. Low density

h. Low thermal conductivity

15) In general, ceramics are seen as a which of the following real estate (four best answers): a. Brittleness

b. Chemical inertness

c. Electrically insulating

d. Substantial electrical conductivity

e. High solidity

f. High heat conductivity

g. Low density

h. Low thermal conductivity

Component 2: Brief Answers

1) Describe why covalently bonded supplies are generally fewer dense than ionically or metallically bonded ones.

2) For a hard compound, what are the two qualities of the component ions that determine the crystal composition?

3) Explain quickly why the tendency of a polymer to decide upon decreases with increasing molecular weight.

4) What type of bonding will be expected to get the following components:

a. A copper- dime alloy: _______________________________

b. Rubberized: _______________________________

c. Barium sulphide (BaS): _______________________________

d. Sturdy xenon: _______________________________

e. Durete: _______________________________

Portion 3: Write short, but concise explanation for each term.

1 ) Covalent Relationship -

installment payments on your Ionic Bond –

3. Secondary Bonds -

four. Thermoset Polymers –

5. Thermoplastic Polymers –

Component 4: Descriptive Answers

The number- average molecular fat of a polypropylene is 1, 000, 000 g/mol. Compute the degree of polymerization.

(Hint: Repeat product of polypropylene is...

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