« previous next »
Pages: 1 ... 4 5 [6] 7 8 9   Go Down

Author Topic: Chemistry Help needed!:-(  (Read 13115 times)

Offline hyebyekadal

  • SF Citizen
  • ***
  • Posts: 182
  • Reputation: 17
Re: Chemistry Help needed!:-(
« Reply #75 on: May 08, 2009, 04:50:11 pm »
atttached paper Q5
Logged

Offline Christy

  • SF Citizen
  • ***
  • Posts: 145
  • Reputation: 2
Re: Chemistry Help needed!:-(
« Reply #76 on: May 08, 2009, 05:14:03 pm »
water droplets came from the solid X .... hence the water on the top of the test tube  .... hence its hydrated
Logged

Offline godfather93

  • SF Senior Citizen
  • *****
  • Posts: 720
  • Reputation: 799
  • Gender: Male
  • Tomorrow is a day that changes everyday
Re: Chemistry Help needed!:-(
« Reply #77 on: May 08, 2009, 05:18:24 pm »
what i don't understand in the question is how is the salt a nitrate? (according to ms)
Logged

Offline hyebyekadal

  • SF Citizen
  • ***
  • Posts: 182
  • Reputation: 17
Re: Chemistry Help needed!:-(
« Reply #78 on: May 08, 2009, 05:23:24 pm »
water is not acidic is it?? then why does ph indicator show RED??/
also ms for the q is acidic gas..
Logged

Offline Pharoah

  • SF Immigrant
  • **
  • Posts: 61
  • Reputation: 6
  • Gender: Male
Re: Chemistry Help needed!:-(
« Reply #79 on: May 08, 2009, 05:33:38 pm »
Nitrogen oxide is produced on heating which is acidic. Thus, litmus goes red.
Logged
Victory is only a stone's throw away!

Offline godfather93

  • SF Senior Citizen
  • *****
  • Posts: 720
  • Reputation: 799
  • Gender: Male
  • Tomorrow is a day that changes everyday
Re: Chemistry Help needed!:-(
« Reply #80 on: May 08, 2009, 05:35:24 pm »
thanks a lot pharoah!
but how come the ammonia is also released?
Logged

Offline hyebyekadal

  • SF Citizen
  • ***
  • Posts: 182
  • Reputation: 17
Re: Chemistry Help needed!:-(
« Reply #81 on: May 08, 2009, 05:47:35 pm »
why is ammonia produced?
o god learn you anion tests!!!!!!!!!!
because you add Al foil and make alkali with sodium hydroxde!! see last part of question!!!!!
and pharoah I think you are right but what's that go to do with hydrated salt?? that's what it says in ms!!
Logged

Offline godfather93

  • SF Senior Citizen
  • *****
  • Posts: 720
  • Reputation: 799
  • Gender: Male
  • Tomorrow is a day that changes everyday
Re: Chemistry Help needed!:-(
« Reply #82 on: May 08, 2009, 05:50:19 pm »
I THINK I DO KNOW MY ANION TESTS! >:(
I'm just asking how is it possible that both an acidic and alkaline gas is produced.
Logged

Offline hyebyekadal

  • SF Citizen
  • ***
  • Posts: 182
  • Reputation: 17
Re: Chemistry Help needed!:-(
« Reply #83 on: May 08, 2009, 06:11:01 pm »
kk chill!
Logged

Offline godfather93

  • SF Senior Citizen
  • *****
  • Posts: 720
  • Reputation: 799
  • Gender: Male
  • Tomorrow is a day that changes everyday
Re: Chemistry Help needed!:-(
« Reply #84 on: May 08, 2009, 06:13:17 pm »
all cool!! ;D ;D
Logged

Offline butterfly_taz

  • Newbie
  • *
  • Posts: 1
  • Reputation: 0
  • Gender: Female
Re: Chemistry Help needed!:-(
« Reply #85 on: May 08, 2009, 06:37:26 pm »
hey..i also need phy notes...n if anyone can get me business IT biology chemistry...it would be a great help..thanx... :)
Logged
bom chika wah wah!!

Offline Pharoah

  • SF Immigrant
  • **
  • Posts: 61
  • Reputation: 6
  • Gender: Male
Re: Chemistry Help needed!:-(
« Reply #86 on: May 08, 2009, 07:33:40 pm »
Quote
why is ammonia produced?
o god learn you anion tests!!!!!!!!!!
because you add Al foil and make alkali with sodium hydroxde!! see last part of question!!!!!
and pharoah I think you are right but what's that go to do with hydrated salt?? that's what it says in ms!!

Evidence for it being a hydrated salt comes from the condensation at the top of the tube. When the salt is heated, water is converted into steam which again condenses to water on the cooler upper parts of the test tube. If it was not a hydrated salt, the condensation would not take place.
Logged
Victory is only a stone's throw away!

Offline SGVaibhav

  • SF Farseer
  • *******
  • Posts: 3013
  • Reputation: 5737
  • Gender: Male
  • Bugatti Veyron 16.4
Re: Chemistry Help needed!:-(
« Reply #87 on: May 08, 2009, 07:42:11 pm »
if we only heat, wouldnt there be steam on the test tube that would be called condensation?

or is it the condensation that occurs after heating has been stopped?
Logged

Offline Pharoah

  • SF Immigrant
  • **
  • Posts: 61
  • Reputation: 6
  • Gender: Male
Re: Chemistry Help needed!:-(
« Reply #88 on: May 08, 2009, 07:50:39 pm »
Condensation will occur on any cool surface. It doesn't matter whether heating is going on or not since glass is a very poor conductor of heat but more condensation will occur when heating is stopped as the surfaces get cooler.
Logged
Victory is only a stone's throw away!

Offline SGVaibhav

  • SF Farseer
  • *******
  • Posts: 3013
  • Reputation: 5737
  • Gender: Male
  • Bugatti Veyron 16.4
Re: Chemistry Help needed!:-(
« Reply #89 on: May 08, 2009, 07:52:58 pm »
thanx for the info.
+rep
Logged
Pages: 1 ... 4 5 [6] 7 8 9   Go Up
« previous next »