prelim org chem lesson 2 Flashcards

1
Q

the simplest alkyne

A

acetylene

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2
Q

In ethylene, the actual angles are close to

A

120°

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3
Q

The VSEPR model predicts bond angles of

A

120°

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4
Q

two different groups on each carbon of the double bond shows

A

cis-trans isomerism

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5
Q

Use the ending -ene to show the presence of the C=C

A

alkenes

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6
Q

use the ending -yne to show the presence of the triple bond.

A

alkynes

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7
Q

that contain more than one double bond are named as alkadienes, alkatrienes, and so on.

A

alkenes

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8
Q

Those that contain several double bonds are referred to more generally as

A

polyenes

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9
Q

polyenes (greek:

A

poly, many

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10
Q

are nonpolar compounds.

A

Alkenes and alkynes

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11
Q

are insoluble in water but soluble in one another and in nonpolar organic liquids.

A

Alkenes and alkynes

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12
Q

that are liquid or solid at room temperature have densities less than 1.0 g/mL; they float on water.

A

Alkenes and alkynes

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13
Q

a compound whose carbon skeleton can be divided into five-carbon units identical with the carbon skeleton of isoprene.

A

terpene

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14
Q

Most alkene addition reactions are

A

exothermic

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15
Q

Markovnikov’s rule

A

H adds to the less substituted carbon and X to the more substituted carbon.

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16
Q

when a reaction has two or more possible products, but one of the products is preferred over the other(s)

A

regioselective

17
Q

Chemists account for the addition of HX to an alkene by a two-step

A

reaction mechanism

18
Q

shows the origin of the electron pair (either on an atom or in the double bond).

A

tail of an arrow

19
Q

shows its new position.

A

head of the arrow

20
Q

head of the arroshow us which bonds break and which new ones form.

A

Curved arrows

21
Q

Addition of water is called

22
Q

is acid catalyzed, most commonly by H2SO4

23
Q

the single most important reaction of alkenes is

A

polymerization

24
Q

polymer:
monomer:

A

Greek: poly, many and meros, part

Greek: mono, single and meros, part

25
Q

can be reproduced by repeating the enclosed structure in both directions.

A

structure of a polymer chain

26
Q

a highly branched polymer; polymer chains do not pack well and London dispersion forces between them are weak.

A

Low-density polyethylene (LDPE)

27
Q

softens and melts above 115°C.

A

Low-density polyethylene (LDPE)

28
Q

approximately 65% used for the production of films for packaging and for trash bags.

A

Low-density polyethylene (LDPE)

29
Q

only minimal chain branching; chains pack well and London dispersion forces between them are strong.

A

High-density polyethylene (HDPE)

30
Q

has higher melting point than LDPE and is stronger

A

High-density polyethylene (HDPE):

31
Q

can be blow molded to squeezable jugs and bottles.

A

High-density polyethylene (HDPE):