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chem > Module 4.1- organic compounds > Flashcards

Module 4.1- organic compounds Flashcards

1
Q

whats the general formula

A

an algebraic formula that can describe any member of a family of compounds e.g. CnH2n+2

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2
Q

whats the empirical formula

A

the simplest ratio of atoms of each element in a compound e.g CH3

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3
Q

whats the molecular formula

A

the number pf atoms of each element in a molecule with the functional groups indicated e.g. C4H9OH

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4
Q

whats the structural formula

A

shows the atoms of carbon by carbon with the attached hydrogens and functional group e.g CH3CH3CH2OH

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5
Q

whats the displayed formula

A

shows how all the atoms are arranged and all the bonds between them e.g H H
| |
H-C-C-H
| |
H H

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6
Q

whats the skeletal formula

A

shows the bonds of the carbon skeleton with any functional group e.g. /\/\/\/

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7
Q

what are aliphatic compounds

A

carbon atoms are joined together as straight chains or branched chains

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8
Q

what are alicyclic compounds

A

carbon atoms are joined together in a ring structure but not aromatic

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9
Q

what are aromatic compounds

A

at least one benzene ring in the structure ⬡

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10
Q

stem for a chain with 1 carbon

A

meth-

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11
Q

stem for a chain with 2 carbons

A

eth-

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12
Q

stem for a chain with 3 carbons

A

prop-

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13
Q

stem for a chain with 4 carbons

A

but-

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14
Q

stem for a chain with 5 carbons

A

pent-

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15
Q

stem for a chain with 6 carbons

A

hex-

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16
Q

stem for a chain with 7 carbons

A

hept-

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17
Q

stem for a chain with 8 carbons

A

oct-

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18
Q

stem for a chain with 9 carbons

A

non-

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19
Q

stem for a chain with 10 carbons

A

dec-

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20
Q

alkanes functional group

A

c-c

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21
Q

alkenes functional group

A

c=c

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22
Q

alcohols functional group & suffix

A

-oh & -ol

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23
Q

halogen alkanes prefix and suffix

A

halo (e.g chloro) & -ane

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24
Q

aldehydes functional group prefix and suffix

A

O
||
-C-H

oxo-
-al

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25
Q

ketones functional group prefix and suffix

A

O
||
C-C-C

keto/oxo-
-one

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26
Q

esters functional group prefix and suffix

A 
O
    ||
   -C-O-C
alkoxy carbonyl-
-oate
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27
Q

carboxylic acid functional group prefix and suffix

A 
O
   ||
  C-OH
carboxy-
-oic acid
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28
Q

amine functional group prefix and suffix

A

-NH2
Amino-
-amine

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29
Q

amide functional group prefix and suffix

A 
O
   ||
  C-NH2
amido-
-amide
30
Q

whats a homologous series

A

a series of organic compounds having the same functional group but which each successive member differing by CH2

31
Q

what are alkanes

A

saturated hydrocarbons that have a single (sigma)

bond, they are part of the same homologous series.

32
Q

whats a sigma bond

A

the overlap of orbitals between two atoms

33
Q

why do straight chains have higher boiling points than isomers of itself

A
  • straight chains can get closer together
  • straight chains have more surface contact between molecules (not surface area) giving more induced dipole dipole forces.
  • these require more energy to break so bp is higher
34
Q

what forces act between hydrocarbons

A

London forces

35
Q

complete combustion of alkanes, methane+ oxygen

A

methane + oxygen—> carbon dioxide + water

36
Q

incomplete combustion of alkanes, methane+ oxygen

A

methane + oxygen—-> carbon monoxide + water + carbon

37
Q

why are alkanes not very reactive

A
  • they have a high bond enthalpy (strong bonds)

- very low polarity of sigma bonds present ( aren’t very polar)

38
Q

what are isomers

A

molecules with the same molecular/chemical formula but different displayed/ structural formula

39
Q

what are the two types of isomers

A

structural isomers and stereoisomers

40
Q

what are structural isomers

A

-same molecular formula, different structural formula

41
Q

what are stereoisomers

A

-have the same structural formula but different arrangement of atoms in place

42
Q

what are the 3 isomers of pentane ( including pentane)

A

pentane
2-methylbutane
2,2-dimethylpropane

43
Q

what are position isomers

A

where functional groups can be in different positions on the carbon carbon chain resulting in isomers

44
Q

name all the position isomers for 1,1-dichloropropane

A

1,1-dichloropropane
1,2-dichloropropane
1,3-dichloropropane
2,2-dichloropropane

45
Q

breaking covalent bonds, unequal splitting, what does it produce and what is it known as?

A
  • produces ions

- known as heterolysis or heterolytic fission

46
Q

breaking covalent bonds, equal splitting, what does it produce and what is it known as?

A
  • produces radicals (now more reactive)

- known as homolysis or homolytic fission

47
Q

what are radicals

A

highly reactive species with one or more unpaired electron.

48
Q

halogenalkanes from alkanes general equation

A

CnH2n+2 + X2 —> CnH2n+1X + HX

49
Q

whats a functional group

A

a group of atoms responsible for the characteristic reactions of a compound.

50
Q

plastics can be disposed in 6 ways…

A
  • landfill
  • combustion
  • electricity generation
  • reuse
  • recycle
  • organic feedstock
51
Q

recycling negatives:

A
  • costly
  • plastics have to be sorted
  • requires high technology
  • labour intensive
52
Q

how d photodegradable plastics break down

A

break down chemically using energy with wavelengths simmilar to light . once the process begins it cant be stopped

53
Q

organic feedstock explanation

A

plastics are separated and broken down into small organic molecules through a series of reactions. the molecules can then be used to produce plastics in other industries

54
Q

negatives of photodegradable polymers

A

may not be exposed to sufficient light

55
Q

when halogens react with alkanes what do they form

A

haloalkanes

56
Q

when halogens react with alkanes, what is tis type of reaction called

A

free radical substitution

57
Q

what is substituted during free radical substitution

A

a hydrogen atom is replaced by (substituted by) chlorine or bromine

58
Q

halogens+alkanes: write the overall equation for chlorine reacting with bromine

A

CH4 + Cl2 –> CH3Cl + HCl

59
Q

write an overall equation to show the formation of bromomethane from methane and bromine

A

CH4 + Br2 –> CH3Br + HBr

60
Q

when is a Pi bond formed

A

formed by the sideways overlap of two adjacent p orbitals.

61
Q

when are sigma bonds formed

A

when two s orbitals overlap

62
Q

talk about the strength of sigma bonds

A

the high electron density between the nuclei means there is a strong electrostatic attraction between the nuclei and shared pair of electrons- this means that there is a high bond enthalpy- they are the strongest type of bonds. (the C-C and C-H) bonds in alkanes are all sigma bonds

63
Q

talk about the strength of Pi bonds

A

much weaker than sigma bonds because the electron density is spread out above and below the nuclei. this means that the electrostatic attraction between the nuclei and shared pair of electrons is weaker, so Pi bonds have a relatively low bond enthalpy.

64
Q

why are alkenes much more reactive than alkanes (lengthy)

A

1) Alkanes only contain C-C and C-H sigma bonds= high bond enthalpy= difficult to break, the bonds are also non-polar so they don’t attract nucleophiles or electrophiles thus they dont react easily
2) Alkenes are more reactive than alkanes because the C=C bond contains both a sigma bond and a Pi bond.
3) The C=C double bond contains 4 electrons so it sticks out above and below the rest of the molecule . These two factors means the Pi bond is likely to be attacked by electrophiles, the low bond enthalpy of the Pi bond also contributes to the reactivity of alkenes
4) because the double bond is so reactive, alkenes are handy starting points for making other organic compounds and for making petrochemicals

65
Q

what does the restricted rotation of the C=C bonds cause alkenes to form

A

to form stereoisomers

66
Q

what is stereoisomerism and talk about the types of stereoisomerism

A
  • stereoisomers occur when two double bonded carbon atoms each have two different atoms or groups attached to them
  • E/Z isomerism is a type of stereoisomerism
  • E/Z isomers can sometimes be called cis/trans isomers
67
Q

how do u work out the priority of E/Z isomers

A
  • firstly split down vertically on the C=C bond and look a the split off sections individually to find the atom with the larger atomic number as its given higher priority.
68
Q

why is ethene said to be planar

A

carbon atoms on a C=C double bond and the atoms bonded to these carbons all lie in the same place, they’re planar

69
Q

E/Z isomerism: what do u do when the atoms directly bonded to the carbon are the same when trying to figure out priority

A

-you need to look further along the chain (look at the next atom in the group to work out which has a higher priority)

70
Q

cis/trans: what does cis mean

A

the same groups on the same side of the double bond

71
Q

cis/trans: what does trans mean

A

the same groups are on the opposite side of the double bond

72
Q

whats it called when halogens react with alkenes

A

electrophilic addition, electrophile (electron pair acceptors)

chem (14 decks)

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