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AQA Chemistry - Wednesday 4th June 08

Another Question:
With the help of an equation give two reasons chlorine is added to swimming pools.

And for mod 3:
Ethene can be made into two different saturated hydrocarbons, what are they and what are the methods used.

Reply 21

memenme_1

6

Dadeyemi

Another Question:
With the help of an equation give two reasons chlorine is added to swimming pools.

And for mod 3:
Ethene can be made into two different saturated hydrocarbons, what are they and what are the methods used.

1 - Cl2 + H20 = 2H+ + Cl - + ClO-
to kill bacteria.....
2- Hydrogenation - ethane...cant think of the other! :biggrin:

Reply 22

Irrelevance

16

Dadeyemi

Another Question:
With the help of an equation give two reasons chlorine is added to swimming pools.

Bah, i can't do this. Is it:

Cl2 + H2O -> HCL + HOCL

Added to pools to disinfect and i can't think of a second reason :s-smilie:

Reply 23

Irrelevance

16

memenme_1

2- Hydrogenation - ethane...cant think of the other! :biggrin:

Not doing Module 3 but it's got to be epoxyethane after reacting with O2 and a silver catalyst? I'm never sure about any of my answers lol

Reply 24

Dadeyemi

13

Irrelevance

Not doing Module 3 but it's got to be epoxyethane after reacting with O2 and a silver catalyst? I'm never sure about any of my answers lol

epoxy ethane is not a hydrocarbon it has oxygen

Here's a clue it is a solid

Reply 25

RHCPfan

OP

12

A module 1 term:

Define electronegtivity? :smile:

Reply 26

RHCPfan

OP

12

Dadeyemi

epoxy ethane is not a hydrocarbon it has oxygen

Here's a clue it is a solid

Is it to do with cracking?
Polyethene?

I've forgotten some of module 3 but thankfully not resitting

Reply 27

soul02

8

RHCPfan

A module 1 term:

Define electronegtivity? :smile:

electronegatitvy is the power of an atom to withdraw covalent density from a covalent bond

Reply 28

krazzie_ammo

it's electron density, not covalent density mate

OP

^
Yeah it is

anyone know whether we need to know about finding the amount of chlorine in cleach?

Reply 31

Dadeyemi

13

RHCPfan

A module 1 term:

Define electronegtivity? :smile:

I've already done mod 1 but whatever.

Spoiler

Reply 32

Dadeyemi

13

dealer91

anyone know whether we need to know about finding the amount of chlorine in cleach?

I think you do.

Reply 33

krazzie_ammo

Dadeyemi

Another Question:
With the help of an equation give two reasons chlorine is added to swimming pools.

And for mod 3:
Ethene can be made into two different saturated hydrocarbons, what are they and what are the methods used.

i think its Cl2 + H20 = HCl + HOCl, it asks for the equation...not ionic equation.

ethane = hydration. phosphoric acid catalyst. 300 degrees c.
poly(ethane) = catalytic/thermal cracking. i'm guessing for poly(ethane).

Reply 34

Tiger_S

im retaking mod 2 to try and get full UMS, if you want good revision, take the 2001- 2004 papers, they are 1 and a half hours long, and basically cover everything on the module in the paper rather then jus some parts like recent papers do. Question, whats the reagent used to determine the endpoint in the titration to determine the amount of bleach in a substance. What is the oxidation state of M in the ionic compound MQ, why do you remove Sulpher forn the Blast furnace first, and write an equation for the reaction between Sodium Fluoride and c.H2s04. What type of reaction is this?

Il tell you if your write or wrong.

source for ealier papers: http://www.freeexampapers.com/A%20Level/Chemistry/AQA/

Reply 35

Dadeyemi

13

RHCPfan

Is it to do with cracking?
Polyethene?

I've forgotten some of module 3 but thankfully not resitting

Poly ethene is right!

but its polymerisation

Reply 36

soul02

8

why do you remove Sulpher forn the Blast furnace first

u remove S from the blast furnace fisrt to stop it forming sulphur dioxide which leads to acid rain if it reacts with more oxygen

Reply 37

Tiger_S

right, what expensive metal is used to remove the Sulpher?

Reply 38

Dadeyemi

13

Tiger_S

right, what expensive metal is used to remove the Sulpher?

Magnesium

Reply 39

procrastinator21

motiv3

All 3 in one sitting and day after biology...way to fail AQA...way to fail!

um btw its not AQA that made it that they try to make all exam boards on the same day.. OCR chem and bio are weds and tues too... 2 of my firends have ALL their exams this weeek (except C1/C2 and general they hardly take effort)

AQA Chemistry - Wednesday 4th June 08

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