« previous next »
Pages: 1 ... 19 20 [21] 22 23 ... 25   Go Down

Author Topic: CHEMISTRY PAPER 1 HERE  (Read 38401 times)

Offline sweetsh

  • Retired Adminstrator
  • SF V.I.P
  • ********
  • Posts: 7049
  • Reputation: 65535
  • Gender: Female
  • *Freedom
Re: CHEMISTRY PAPER 1 HERE
« Reply #300 on: June 11, 2009, 08:20:48 pm »
No its okay
Logged

Offline GodOfWar

  • MacSabotuer
  • SF Citizen
  • ***
  • Posts: 132
  • Reputation: 195
  • Gender: Male
Re: CHEMISTRY PAPER 1 HERE
« Reply #301 on: June 11, 2009, 08:52:20 pm »
um sweetsh.. do u EVER go offline
Logged
You got me ten feet off the ground <|3

Offline sweetsh

  • Retired Adminstrator
  • SF V.I.P
  • ********
  • Posts: 7049
  • Reputation: 65535
  • Gender: Female
  • *Freedom
Re: CHEMISTRY PAPER 1 HERE
« Reply #302 on: June 11, 2009, 08:53:25 pm »
Yes..
Actually if you wonder I keep my PC open during the day and check the forum from time to time..Just to make sure everything is going on in the proper way
Logged

Offline goin4dakill

  • SF Citizen
  • ***
  • Posts: 157
  • Reputation: 5
Re: CHEMISTRY PAPER 1 HERE
« Reply #303 on: June 11, 2009, 08:56:40 pm »
Isnt a redox reactions when the reaction has oxidation and reduction at the same time???

The how come S + 2O2--> SO4 is a redox reaction???

Logged

Offline GodOfWar

  • MacSabotuer
  • SF Citizen
  • ***
  • Posts: 132
  • Reputation: 195
  • Gender: Male
Re: CHEMISTRY PAPER 1 HERE
« Reply #304 on: June 11, 2009, 09:05:03 pm »
oh, ur the admin  ;D  heheh
Logged
You got me ten feet off the ground <|3

Offline bball92

  • SF Immigrant
  • **
  • Posts: 91
  • Reputation: 17
Re: CHEMISTRY PAPER 1 HERE
« Reply #305 on: June 11, 2009, 09:09:38 pm »
Quote from: goin4dakill on June 11, 2009, 08:56:40 pm
Isnt a redox reactions when the reaction has oxidation and reduction at the same time???

The how come S + 2O2--> SO4 is a redox reaction???



It isnt... :P
Logged

Offline sweetest angel

  • Oh dear beach I await...
  • SF Geek
  • ****
  • Posts: 346
  • Reputation: 259
  • Gender: Female
Re: CHEMISTRY PAPER 1 HERE
« Reply #306 on: June 11, 2009, 09:14:14 pm »
Quote from: goin4dakill on June 11, 2009, 08:56:40 pm
Isnt a redox reactions when the reaction has oxidation and reduction at the same time???

The how come S + 2O2--> SO4 is a redox reaction???


well i finally understood it
u see the oxidation is easy to get since sulphur gains oxygen atom
now reduction: the oxidation is where the oxygen here becomes from an atom of no oxidation state to losing being of oxidation state of -2 in SO4, thus lose of oxidation state is reduction . that's it ;D!
Logged
"Dont fear the creation, but fear the creator who has created the creation you fear"
"If you educate a man, you educate an individual, but if you educate a female, you educate a nation"
 I DO WHAT I WANT WHERE I WANT WHEN I WANT if mom says ok.

Offline Hope

  • Newbie
  • *
  • Posts: 42
  • Reputation: 5
Re: CHEMISTRY PAPER 1 HERE
« Reply #307 on: June 11, 2009, 09:15:08 pm »
Could anyone please explain why the answer to November 2008 qn 23 is A?
Logged

Offline sweetest angel

  • Oh dear beach I await...
  • SF Geek
  • ****
  • Posts: 346
  • Reputation: 259
  • Gender: Female
Re: CHEMISTRY PAPER 1 HERE
« Reply #308 on: June 11, 2009, 09:18:51 pm »
Quote from: goin4dakill on June 11, 2009, 08:03:47 pm
OK June 2005.

Which reacts with cold water only when finely powdered?
A. Calcium
B. Copper
C. Sodium
D. Magnesium

I put Sodium because its higher in the reactivity series, but the ms said magnesium...
WHY?? help urgently..?
well its in the chapter "PERIODIC TABLE"..where one of the things u gotta learn is that from group II elements magnesium and beryllium react only with steam...and with cold water if powdered, to produce their oxide and liberate hydrogen..while as u knw otha elements of group II react with cold water to form their hydroxide and liberate hydrogen gas
Logged
"Dont fear the creation, but fear the creator who has created the creation you fear"
"If you educate a man, you educate an individual, but if you educate a female, you educate a nation"
 I DO WHAT I WANT WHERE I WANT WHEN I WANT if mom says ok.

Offline cockyxrocker

  • Newbie
  • *
  • Posts: 32
  • Reputation: 7
Re: CHEMISTRY PAPER 1 HERE
« Reply #309 on: June 11, 2009, 09:19:18 pm »
Nov 2008 questions 15,20,29
help!..
Logged

Offline sweetest angel

  • Oh dear beach I await...
  • SF Geek
  • ****
  • Posts: 346
  • Reputation: 259
  • Gender: Female
Re: CHEMISTRY PAPER 1 HERE
« Reply #310 on: June 11, 2009, 09:20:56 pm »
Quote from: Hope on June 11, 2009, 09:15:08 pm
Could anyone please explain why the answer to November 2008 qn 23 is A?
magnesium chloride is ALREADY a salt..thus won't react with anything let it be an acid or not to form anotha salt...thus A where that option has a cross!
Logged
"Dont fear the creation, but fear the creator who has created the creation you fear"
"If you educate a man, you educate an individual, but if you educate a female, you educate a nation"
 I DO WHAT I WANT WHERE I WANT WHEN I WANT if mom says ok.

Offline sweetsh

  • Retired Adminstrator
  • SF V.I.P
  • ********
  • Posts: 7049
  • Reputation: 65535
  • Gender: Female
  • *Freedom
Re: CHEMISTRY PAPER 1 HERE
« Reply #311 on: June 11, 2009, 09:21:28 pm »
15)a
20)b
29)b
Logged

Offline Hope

  • Newbie
  • *
  • Posts: 42
  • Reputation: 5
Re: CHEMISTRY PAPER 1 HERE
« Reply #312 on: June 11, 2009, 09:24:20 pm »
I thought about it..and thought so. But, I did a bit of research and found that it could react! That's just too confusing :(
Logged

Offline sweetest angel

  • Oh dear beach I await...
  • SF Geek
  • ****
  • Posts: 346
  • Reputation: 259
  • Gender: Female
Re: CHEMISTRY PAPER 1 HERE
« Reply #313 on: June 11, 2009, 09:30:54 pm »
Quote from: cockyxrocker on June 11, 2009, 09:19:18 pm
Nov 2008 questions 15,20,29
help!..
15) C...if it absorbs 10 from 1000cm^3 then it would absorb twice as much of heat from 500cm^3 since volume is halved!
20)HCL + BaNO3-->HNO3+BACL ....therefore the acidic nitric acid decrease the pH and since barium reacts with chlorine,therfore no precipitate
29)metals donot have 6 in their outa shell and always form ionic compounds thus B
Logged
"Dont fear the creation, but fear the creator who has created the creation you fear"
"If you educate a man, you educate an individual, but if you educate a female, you educate a nation"
 I DO WHAT I WANT WHERE I WANT WHEN I WANT if mom says ok.

Offline sweetsh

  • Retired Adminstrator
  • SF V.I.P
  • ********
  • Posts: 7049
  • Reputation: 65535
  • Gender: Female
  • *Freedom
Re: CHEMISTRY PAPER 1 HERE
« Reply #314 on: June 11, 2009, 09:35:15 pm »
I can't get this, what's the difference between molten and aqueos?
Logged
Pages: 1 ... 19 20 [21] 22 23 ... 25   Go Up
« previous next »