304

Question 1

Donation of an electron by one atom to another is normally occured in:

Answer 1

Ionic bonds

Question 2

Attractive forces between molecules:

Answer 2

Intermolecular
Secondary
Van der waals
(All of the above)

Question 3

Atoms are held together by primary bonds such as:

Answer 3

Ionic
Covalent
Coordination
(All of the above)

Question 4

NONPOLAR covalent bonds can be obtained when the electro negativity between two atoms in a molecule is

Answer 4

Lower than 0.5

Question 5

Hydrocarbons that contain a double bond between 2 carbon atoms are called

Answer 5

ALKENES. ENES

Question 6

Unsaturated hydrocarbons contain

Answer 6

CC double bonds
CC triple bonds

Question 7

Alcohols react with acids to form

Answer 7

Esters

Question 8

Diacids are monomers for synthesis of

Answer 8

Polyesters
Polyamids

Question 9

Hydrogen bonds is the most important interaction bond in organic molecules and polymers

Answer 9

FALSE.

Question 10

Electro negativity can be directly calculated

Answer 10

NO. FALSE

Question 11

Electro negativity can be calculated from

Answer 11

Atomic / molecular properties
Ionization energy
Electron affinity

Question 12

Ionization energy is the minimum energy release to remove the most loosely bound electron of an isolated gaseous atom, positive ion, or molecule

Answer 12

FALSE

Question 13

Electron affinity is the amount of energy required when an electron starches to a neutral atom or molecule in the gaseous state to form an anion

Answer 13

FALSE

Question 14

Electronegativity increaes from right to left on periodic table

Answer 14

FALSE

Question 15

C-F is less polar than C-H

Answer 15

False

Question 16

Coordination bond is an alternate ionic bond

Answer 16

False

Question 17

Coordination bond can be formed by

Answer 17

Sharing of electron pair from a single atom

Question 18

Hydrocarbons contain carbon, hydrogen, and oxygen

Answer 18

False

Question 19

ALKANES HAVE THE FORMULA

Answer 19

CnH2n+2

Question 20

NAME OF (hexagon)

Answer 20

CYCLOHEXANE

Question 21

Allene’s have

Answer 21

Carbon carbon triple bond

Question 22

Aromatic compounds must be

Answer 22

Cyclic
Conjugated
Obey huckels rule

Question 23

NAPTHANE

Answer 23

8 bi-electrons

Question 24

HEXAGON WITH COOH

Answer 24

Benzoic acid

Question 25

AMIDE GROUP (R,R’,R’’)

Answer 25

AMIDE GROUP

Question 26

Compound (UFO) N R1R2

Answer 26

Secondary amine

Question 27

ESTER GROUP

Answer 27

2 R, C=O

Question 28

Alcohols react with isocyanates to form urethanes

Answer 28

FALSE

Question 29

Stoichomerty ratio is the number relationship between

Answer 29

Reactive groups in a reaction

Question 30

Polyurethanes can fort

Answer 30

Hydrogen bond and thus be very crystalline

Question 31

Polyester is the first thermo setting resin

Answer 31

FALSE

Question 32

In thermoplastic materials, the chains do share bonds w surrounding chains

Answer 32

FALSE

Question 33

Unsaturated diacids procife unsaturation (double bond) as reactive cross linking cite

Answer 33

TRUE

Question 34

Epoxy ring reacts with amine to open the ring

Answer 34

TRUE

Question 35

Thermoset with fully reacted groups ensure the max stability

Answer 35

TRUE

Question 36

Dimensional stability of thermosets its lower than thermoplastics

Answer 36

FALSE

Question 37

Chemical resistance of thermosets is lower than amorphous

Answer 37

FALSE

Question 38

Hear can remelt thermosets

Answer 38

FALSE

Question 39

Which of the following compounds can make thermosets

Answer 39

Epoxy polyester Phenolic

Question 40

Acids react with alchohols to produce polyester

Answer 40

FALSE

Question 41

NAME OF HEXAGON CH-CH2

Answer 41

Vinyl toulouene

Question 42

Aliphatic amines react with epoxy at lower temp than aromatic amines

Answer 42

TRUE

Question 43

Partially cured thermosets with unreacted groups can lead to property changes over time

Answer 43

True

Question 44

Reactive modifiers normally used with thermoset polymers

Answer 44

Improve impact Improve adhesion Lower exotherm

Question 45

Thixotropic agents increase viscosity of incited thermosets

Answer 45

TRUE

Question 46

RXN of diisocyanates with diols produces polyurethanes

Answer 46

TRUe

Question 47

Phenolic thermosets can be obtained by rxn of

Answer 47

Phenols and formaldehydes