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304 Flashcards

1
Q

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

A

Ionic bonds

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2
Q

Attractive forces between molecules:

A

Intermolecular
Secondary
Van der waals
(All of the above)

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3
Q

Atoms are held together by primary bonds such as:

A

Ionic
Covalent
Coordination
(All of the above)

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4
Q

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

A

Lower than 0.5

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5
Q

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

A

ALKENES. ENES

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6
Q

Unsaturated hydrocarbons contain

A

CC double bonds
CC triple bonds

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7
Q

Alcohols react with acids to form

A

Esters

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8
Q

Diacids are monomers for synthesis of

A

Polyesters
Polyamids

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9
Q

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

A

FALSE.

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10
Q

Electro negativity can be directly calculated

A

NO. FALSE

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11
Q

Electro negativity can be calculated from

A

Atomic / molecular properties
Ionization energy
Electron affinity

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12
Q

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

A

FALSE

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13
Q

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

A

FALSE

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14
Q

Electronegativity increaes from right to left on periodic table

A

FALSE

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15
Q

C-F is less polar than C-H

A

False

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16
Q

Coordination bond is an alternate ionic bond

A

False

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17
Q

Coordination bond can be formed by

A

Sharing of electron pair from a single atom

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18
Q

Hydrocarbons contain carbon, hydrogen, and oxygen

A

False

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19
Q

ALKANES HAVE THE FORMULA

A

CnH2n+2

20
Q

NAME OF (hexagon)

A

CYCLOHEXANE

21
Q

Allene’s have

A

Carbon carbon triple bond

22
Q

Aromatic compounds must be

A

Cyclic
Conjugated
Obey huckels rule

23
Q

NAPTHANE

A

8 bi-electrons

24
Q

HEXAGON WITH COOH

A

Benzoic acid

25
Q

AMIDE GROUP (R,R’,R’’)

A

AMIDE GROUP

26
Q

Compound (UFO) N R1R2

A

Secondary amine

27
Q

ESTER GROUP

A

2 R, C=O

28
Q

Alcohols react with isocyanates to form urethanes

A

FALSE

29
Q

Stoichomerty ratio is the number relationship between

A

Reactive groups in a reaction

30
Q

Polyurethanes can fort

A

Hydrogen bond and thus be very crystalline

31
Q

Polyester is the first thermo setting resin

A

FALSE

32
Q

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

A

FALSE

33
Q

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

A

TRUE

34
Q

Epoxy ring reacts with amine to open the ring

A

TRUE

35
Q

Thermoset with fully reacted groups ensure the max stability

A

TRUE

36
Q

Dimensional stability of thermosets its lower than thermoplastics

A

FALSE

37
Q

Chemical resistance of thermosets is lower than amorphous

A

FALSE

38
Q

Hear can remelt thermosets

A

FALSE

39
Q

Which of the following compounds can make thermosets

A

Epoxy
polyester
Phenolic

40
Q

Acids react with alchohols to produce polyester

A

FALSE

41
Q

NAME OF HEXAGON CH-CH2

A

Vinyl toulouene

42
Q

Aliphatic amines react with epoxy at lower temp than aromatic amines

A

TRUE

43
Q

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

A

True

44
Q

Reactive modifiers normally used with thermoset polymers

A

Improve impact
Improve adhesion
Lower exotherm

45
Q

Thixotropic agents increase viscosity of incited thermosets

A

TRUE

46
Q

RXN of diisocyanates with diols produces polyurethanes

A

TRUe

47
Q

Phenolic thermosets can be obtained by rxn of

A

Phenols and formaldehydes

304 (1 decks)

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