Final Notes 4

Question 1

Enthalpy source of error

Answer 1

Heat loss to surroundings
Heat capacity
Not under standard condition

Specific heat capacity not the same as water
Density not as same as water

Question 2

How to improve enthalpy accuracy

Answer 2

Wrap cotton wool

Determine heat capacity and take into account

Question 3

Hess s law

Answer 3

Enthalpy change is the same regardless of route

When initial final states are the same

Question 4

Coal
Petroleum
Natural gas
Source

Answer 4

Coal - dead remain plants

Petro natural gas - dead remains marine organism

Question 5

CO        
Suspended particulates
Unburnt hydrocarbons
NO NO2
SO2

Car
Factories
Power stations
Incinerators

Answer 5

Car no SO2
Power stations no unburnt hydrocarbons
Incinerators no unburnt hydrocarbons

Question 6

Effect
CO        
Suspended particulates
Unburnt hydrocarbons
NO NO2
SO2

Answer 6

Co toxic
Suspended respiratory system
Unburnt carcinogenic + photochemical smog
NO   photochemical smog + acid rain
SO2  Acid rain

Question 7

Structural isomer
Stereoisomer
Definition

Answer 7

Different order of arrangements

Differenr spacial arrangements

Question 8

Flame test

Answer 8

Pt wire
HCl to remove previous substance
Dip
Non luminous

Question 9

Making soap

Answer 9

Saponification NaOH conc filter

Salting Out NaCl conc filter - creamy solid

Question 10

Polyethene

Answer 10

Food wraps LD

Bottles HD

Question 11

Polypropene

Answer 11

Food containers

Question 12

Polystyrene

Answer 12

transparent contaainer

Expanded food packages

Question 13

Pvc

Answer 13

Pipes, raincoats

Question 14

Perspex

Answer 14

Glass substitute

Question 15

Teflon

Answer 15

Non sticking pan