Exam ques from doing exams

Question 1

state meaning of term REDOX

Answer 1

reduction and oxidation occur

Question 2

why is this an addition reaction

Answer 2

only one product is formed

Question 3

term used to describe substances with the same molecular formula but different structures

Answer 3

structural isomers

Question 4

2 esters with same molecular formula as propyl propanoate

Answer 4

ethyl butanoate

butyl ethanoate

Question 5

mass

Answer 5

n x Mr = g

Question 6

ionic half-eqn for when zinc electrode dissolves =>

Answer 6

Zn -> Zn2+ + 2e-

Question 7

waste product of fuel cell:

Answer 7

water

Question 8

3 substances manufactured by passing electricity thru brine (conc. aq. NaCl2:

Answer 8

hydrogen, chlorine, sodium hydroxide

Question 9

Formed w/ molten NaCl2:

Answer 9

sodium

Question 10

family of organic compounds with similar chemical properties

why do they have that?

Answer 10

homologous series

bc they’re the same functional group

Question 11

name technique used to separate ethyl propanoate from a mix of 4 esters

Answer 11

fractional distillation

Question 12

a) name gas formed by incomplete combustion of the fuel

b) name 2 non-toxic gases formed

Answer 12

a) carbon monoxide

b) carbon dioxide and nitrogen

Question 13

all four esters made by reacting diff alcohols with the same substance

name:
structure:

Answer 13

propanoic acid

C3H6O2

1 double bond with O to C

Question 14

alcohol used to make methyl propanoate

Answer 14

methanol

Question 15

type of polymerisation that takes place when polymer forms

Answer 15

condensation

Question 16

name a polyester

Answer 16

terylene