« previous next »
Pages: 1 ... 11 12 [13] 14 15 ... 25   Go Down

Author Topic: CHEMISTRY PAPER 1 HERE  (Read 37935 times)

Offline aquarian93

  • SF Citizen
  • ***
  • Posts: 207
  • Reputation: 6
Re: CHEMISTRY PAPER 1 HERE
« Reply #180 on: June 11, 2009, 03:36:22 pm »
Quote from: i-insane on June 11, 2009, 03:32:57 pm
Quote from: aquarian93 on June 11, 2009, 03:28:00 pm
the OH in the COOH of a carboxilyic acid reacts wid NaOH?
Yes, it does! :)

oh okie :)


can anyone help me wid question 11 from Nov 06 paper?
i dont get the question. wont the products jus be chlorine in the anode and Hydrogen in the cathode ???

and sry for lota questions ppl :(
Logged

Offline girl_92

  • SF Geek
  • ****
  • Posts: 318
  • Reputation: 152
  • Gender: Female
Re: CHEMISTRY PAPER 1 HERE
« Reply #181 on: June 11, 2009, 03:38:52 pm »
Quote from: aquarian93 on June 11, 2009, 03:34:55 pm
Quote from: madee on June 11, 2009, 03:33:14 pm
Quote from: aquarian93 on June 11, 2009, 03:28:00 pm
the OH in the COOH of a carboxilyic acid reacts wid NaOH?
wht r u tryin to say i culdnt get u

its a question from may 06 paper

 it isque no 35 ryt
 no it cannot
 how can u have an oh reacting wid another base only da cooh can react the answer is C
Logged
some people sleep to dream while othrs wakeup to follow dem im the second type how abt u

Offline girl_92

  • SF Geek
  • ****
  • Posts: 318
  • Reputation: 152
  • Gender: Female
Re: CHEMISTRY PAPER 1 HERE
« Reply #182 on: June 11, 2009, 03:41:27 pm »
Quote from: aquarian93 on June 11, 2009, 03:36:22 pm
Quote from: i-insane on June 11, 2009, 03:32:57 pm
Quote from: aquarian93 on June 11, 2009, 03:28:00 pm
the OH in the COOH of a carboxilyic acid reacts wid NaOH?
Yes, it does! :)

oh okie :)


can anyone help me wid question 11 from Nov 06 paper?
i dont get the question. wont the products jus be chlorine in the anode and Hydrogen in the cathode ???

and sry for lota questions ppl :(
wen cl is liberated wht is left bck water n the sodium so all ttht forms sodium hydroxide
Logged
some people sleep to dream while othrs wakeup to follow dem im the second type how abt u

Offline unknown

  • SF Immigrant
  • **
  • Posts: 123
  • Reputation: 228
Re: CHEMISTRY PAPER 1 HERE
« Reply #183 on: June 11, 2009, 03:44:14 pm »
hm neone has 2002 n 2001 qp along wth ms fr bth oct n nov
plz post
Logged

Offline sweetie

  • SF Citizen
  • ***
  • Posts: 286
  • Reputation: 258
  • Gender: Female
Re: CHEMISTRY PAPER 1 HERE
« Reply #184 on: June 11, 2009, 03:45:47 pm »
 cn anyone plzzzz xplain da answer 2 chem ppr1  que 20 oct07????

thanx
Logged

....

  • Guest
Re: CHEMISTRY PAPER 1 HERE
« Reply #185 on: June 11, 2009, 03:48:12 pm »
Quote from: notty_me on June 11, 2009, 03:45:47 pm
cn anyone plzzzz xplain da answer 2 chem ppr1  que 20 oct07????

thanx

Both, carbon and calcium react with oxygen in the air. Carbon dioxide forms in the case of carbon, which escapes as a gas, so mass decreases. Calcium oxide formed in the case of calcium, which is a solid, and so mass increases.
Logged

Offline aquarian93

  • SF Citizen
  • ***
  • Posts: 207
  • Reputation: 6
Re: CHEMISTRY PAPER 1 HERE
« Reply #186 on: June 11, 2009, 03:57:27 pm »
cn anyone help me wid question 9 from oct 07?
Logged

....

  • Guest
Re: CHEMISTRY PAPER 1 HERE
« Reply #187 on: June 11, 2009, 04:03:13 pm »
Quote from: aquarian93 on June 11, 2009, 03:57:27 pm
cn anyone help me wid question 9 from oct 07?
Electrolytes are either molten or aqueous. Since water is already there and you have to add something into it, the electrolyte is supposed to be aqueous. For the electrolyte to be aqueous, a soluble salt has to be added to water. That soluble salt is potassium sulfate (D)
Logged

Offline aquarian93

  • SF Citizen
  • ***
  • Posts: 207
  • Reputation: 6
Re: CHEMISTRY PAPER 1 HERE
« Reply #188 on: June 11, 2009, 04:11:18 pm »
Quote from: i-insane on June 11, 2009, 04:03:13 pm
Quote from: aquarian93 on June 11, 2009, 03:57:27 pm
cn anyone help me wid question 9 from oct 07?
Electrolytes are either molten or aqueous. Since water is already there and you have to add something into it, the electrolyte is supposed to be aqueous. For the electrolyte to be aqueous, a soluble salt has to be added to water. That soluble salt is potassium sulfate (D)

thanks alot :)
Logged

Offline aquarian93

  • SF Citizen
  • ***
  • Posts: 207
  • Reputation: 6
Re: CHEMISTRY PAPER 1 HERE
« Reply #189 on: June 11, 2009, 04:14:42 pm »
Quote from: i-insane on June 11, 2009, 03:48:12 pm
Quote from: notty_me on June 11, 2009, 03:45:47 pm
cn anyone plzzzz xplain da answer 2 chem ppr1  que 20 oct07????

thanx

Both, carbon and calcium react with oxygen in the air. Carbon dioxide forms in the case of carbon, which escapes as a gas, so mass decreases. Calcium oxide formed in the case of calcium, which is a solid, and so mass increases.

i had the same doubt, thanks once agn.
Logged

....

  • Guest
Re: CHEMISTRY PAPER 1 HERE
« Reply #190 on: June 11, 2009, 04:15:41 pm »
No problem! :)
Logged

Offline simba

  • Newbie
  • *
  • Posts: 26
  • Reputation: 23
Re: CHEMISTRY PAPER 1 HERE
« Reply #191 on: June 11, 2009, 04:16:31 pm »
will someone explain to me question 11 november07
Logged

Offline Aishath

  • Newbie
  • *
  • Posts: 48
  • Reputation: -3
Re: CHEMISTRY PAPER 1 HERE
« Reply #192 on: June 11, 2009, 04:20:02 pm »
Can someone help me for ques. 36 in OCT/NOV 1997?
Logged

Offline girl_92

  • SF Geek
  • ****
  • Posts: 318
  • Reputation: 152
  • Gender: Female
Re: CHEMISTRY PAPER 1 HERE
« Reply #193 on: June 11, 2009, 04:23:33 pm »
Quote from: Aishath on June 11, 2009, 04:20:02 pm
Can someone help me for ques. 36 in OCT/NOV 1997?
can u send me the paper i dont have it or atlst write the comp que
Logged
some people sleep to dream while othrs wakeup to follow dem im the second type how abt u

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: CHEMISTRY PAPER 1 HERE
« Reply #194 on: June 11, 2009, 04:24:05 pm »
11 For complete combustion, one molecule of an organic compound needs 8 molecules of oxygen.
   What could the formula of this compound be?
   A   C5H11OH
   B   C6H9OH
   C   C6H11OH
   D   C6H12



B is the only one that balances with 8O2

C6H9OH+8O2>5HO2+6CO2
« Last Edit: June 11, 2009, 04:31:37 pm by astarmathsandphysics »
Logged
Pages: 1 ... 11 12 [13] 14 15 ... 25   Go Up
« previous next »