C10 - Alkenes

Question 1

organic molecules

Answer 1

all contain carbon atoms

Question 2

alkene

Answer 2

carbon, carbon double bond
-more reactive that alkane

Question 3

functional group

Answer 3

gives a family of organic compounds their characteristic reactions

Question 4

homologous series

Answer 4

family of organic compounds with the same functional group

Question 5

formula for alkene

Answer 5

CnH2n

Question 6

Alkene combustion features

Answer 6

-burns incomplete combustion (smokier yellow flame)
-releases less energy per mole

Question 7

Which hydrocarbon is used as fuel and why

Answer 7

-alkanes
-burns with a cleaner flame

Question 8

complete combustion

Answer 8

ethene + o2 —> co2 and water

Question 9

Addition reaction of alkene

Answer 9

Carbon carbon double bond opens up and adds another pair of atoms

Question 10

why are alkenes unsaturated

Answer 10

do not contain max number of hydrogens

Question 11

by addition of hydrogen to an alkene what is made

Answer 11

alkane

Question 12

why is addition of hydrogen used

Answer 12

-to straighten unsaturated oil molecules
- increase melting point

Question 13

formation of alcohol

Answer 13

alkene + steam

Question 14

alcohol functional group

Answer 14

-OH

Question 15

Carboxylic acid - functional group

Answer 15

contains -COOH functional group

Question 16

Esters functional group

Answer 16

-COO-

Question 17

ethanol use

Answer 17

-alcoholic drinks
-biofuel
perfume
-mouthwash

Question 18

how is ethanol made

Answer 18

fermenting sugars with yeast
or
hydration of ethene

Question 19

ethanol flame

Answer 19

clean blue flame

Question 20

alcohol and sodium reaction

Answer 20

-fizz (H2 gas)
-not as vigorous as sodium and water

Question 21

sodium alkoxide in water gives you

Answer 21

strong alkaline solution

Question 22

formation of carboxylic acid

Answer 22

oxidation of alcohol
ethanol + oxygen atoms from oxidising agent

Question 23

How can alcohol being exposed form a carboxylic acid

Answer 23

microbes produce it as they react

Question 24

carboxylic acid and metal carbonate

Answer 24

salt + water + co2

-co2 is given off slowly

Question 25

what type of acids are carboxylic acids

Answer 25

weak acids

Question 26

carboxylic acids in water

Answer 26

-dissolves
-ionises but not very well

Question 27

making esters

Answer 27

carboxylic acid and alcohol

Question 28

esters features

Answer 28

-volatile (evaporate easily)
-make sweet smells

Question 29

ester use

Answer 29

(used in perfume or food flavourings)

Question 30

Formula for carboxylic acid

Answer 30

CnH2n+1COOH
(where n is the number of carbon atoms in the molecule, minus 1).