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Author Topic: Chemistry Help HERE ONLY !!  (Read 106215 times)

Offline Nanavel

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Re: Chemistry Help HERE ONLY !!
« Reply #510 on: May 30, 2009, 04:55:52 pm »
1) thallium(1)hydroxide has a similar chemical property to sodium hydroxide .

   i) Given 0.1mol/dm^3 solution of thallium(1)hydroxide and of ammonia , describe how you could show that thallium(!) hydroxide is the stronger base .

     -----------------------------------------------------------------------------------------------

     -----------------------------------------------------------------------------------------------

     ----------------------------------------------------------------------------------------------- [3]

( i think we have to Add universal indicator .. but what the heck .. four lines !! I tihnk we have to write about thier colours changes and PH . I dont know
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questions_of_game

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Re: Chemistry Help HERE ONLY !!
« Reply #511 on: May 30, 2009, 04:57:51 pm »
shogun, next time save ur file as png format or gif format
and nid, i want to know how u wrote the P?
if u paint it red, it looks like blood smeared.
best effects for a horror filmm



thanks nid and shogun for help
i would have done +rep, but i cannot do from this account.
the buttons do no exist only
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #512 on: May 30, 2009, 05:04:11 pm »
Quote from: Nanavel on May 30, 2009, 04:55:52 pm
1) thallium(1)hydroxide has a similar chemical property to sodium hydroxide .

   i) Given 0.1mol/dm^3 solution of thallium(1)hydroxide and of ammonia , describe how you could show that thallium(!) hydroxide is the stronger base .

     -----------------------------------------------------------------------------------------------

     -----------------------------------------------------------------------------------------------

     ----------------------------------------------------------------------------------------------- [3]

( i think we have to Add universal indicator .. but what the heck .. four lines !! I tihnk we have to write about thier colours changes and PH . I dont know

At the same concentration the stronger base has a higher pH.(check with indicator)
At the same concentration the stronger base has a better conductor of electricity.
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Offline SGVaibhav

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Re: Chemistry Help HERE ONLY !!
« Reply #513 on: May 30, 2009, 05:06:49 pm »
i am back xD
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Offline Ghost Of Highbury

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Re: Chemistry Help HERE ONLY !!
« Reply #514 on: May 30, 2009, 05:15:18 pm »
welcome back xD
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Offline Shogun

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Re: Chemistry Help HERE ONLY !!
« Reply #515 on: May 30, 2009, 05:18:03 pm »
Quote from: nid404 on May 30, 2009, 05:04:11 pm
Quote from: Nanavel on May 30, 2009, 04:55:52 pm
1) thallium(1)hydroxide has a similar chemical property to sodium hydroxide .

   i) Given 0.1mol/dm^3 solution of thallium(1)hydroxide and of ammonia , describe how you could show that thallium(!) hydroxide is the stronger base .

     -----------------------------------------------------------------------------------------------

     -----------------------------------------------------------------------------------------------

     ----------------------------------------------------------------------------------------------- [3]

( i think we have to Add universal indicator .. but what the heck .. four lines !! I tihnk we have to write about thier colours changes and PH . I dont know

At the same concentration the stronger base has a higher pH.(check with indicator)
At the same concentration the stronger base has a better conductor of electricity.

just write what the ph should be like, it should be like above 7 and between 11 t0 14 and do this by checking with indicator.

and sure thing, question of game.
« Last Edit: May 30, 2009, 05:20:41 pm by Shogun »
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Offline MaNa

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Re: Chemistry Help HERE ONLY !!
« Reply #516 on: May 30, 2009, 05:52:10 pm »
hey,
umm can some clearify my doubts:)
1)
Q)descirbe the polltuion prblems caused by the disposal of polymer in ther landfills sites n by buring?
2)(c) Each tablet contains the same number of moles of CaCO3 and MgCO3. One tablet
reacted with excess hydrochloric acid to produce 0.24 dm3 of carbon dioxide at r.t.p.
CaCO3 + 2HCl ? CaCl2 + CO2 + H2O
MgCO3 + 2HCl ? MgCl2 + CO2 + H2O
(i) Calculate how many moles of CaCO3 there are in one tablet.
number of moles CO2 = ..............(0.01)
number of moles of CaCO3 and MgCO3 = ..............(0.01)
number of moles of CaCO3 = ..............(0.01)

(ii) Calculate the volume of hydrochloric acid, 1.0 mol /dm3, needed to react with one
tablet.
number of moles of CaCO3 and MgCO3 in one tablet = ..............(0.02)
Use your answer to (c)(i).
number of moles of HCl needed to react with one tablet = ..............(0.02)
volume of hydrochloric acid, 1.0 mol /dm3, needed to
react with one tablet ..............(0.02)
he brackets are my anser cans ome one help?:)
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Offline crypsAnity

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Re: Chemistry Help HERE ONLY !!
« Reply #517 on: May 30, 2009, 06:00:50 pm »
hey ManaH .. okay .. im just anssering ur first one.. because the rest needs calculation and im too lazy to do that!

Disposal of polymers in their landfill sites.. as they are non-biodegradable .. first takes up space .. causes sight pollution ...
and burning it leads to emission of harmful oxides such as oxides of nitrogen .. or carbon monoxide.. which are both harmful ..
(as nitrogen monoxide leads to ozone formation in the lower hemisphere .. guess.. thts wht its called and well carbon monoxide
is a poisonous gas .. harmful for health.. ) and lastly mht also lead to global warming.. as increases emission of carbondioxide into the atmosphere..imbalancing the carbon cycle..
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Offline MaNa

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Re: Chemistry Help HERE ONLY !!
« Reply #518 on: May 30, 2009, 06:04:07 pm »
Quote from: crypsanity on May 30, 2009, 06:00:50 pm
hey ManaH .. okay .. im just anssering ur first one.. because the rest needs calculation and im too lazy to do that!

Disposal of polymers in their landfill sites.. as they are non-biodegradable .. first takes up space .. causes sight pollution ...
and burning it leads to emission of harmful oxides such as oxides of nitrogen .. or carbon monoxide.. which are both harmful ..
(as nitrogen monoxide leads to ozone formation in the lower hemisphere .. guess.. thts wht its called and well carbon monoxide
is a poisonous gas .. harmful for health.. ) and lastly mht also lead to global warming.. as increases emission of carbondioxide into the atmosphere..imbalancing the carbon cycle..

oohkay
Thanx alot
umm + rep for u :)
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #519 on: May 30, 2009, 06:07:28 pm »
Quote from: ManaH on May 30, 2009, 05:52:10 pm
hey,
umm can some clearify my doubts:)
1)
Q)descirbe the polltuion prblems caused by the disposal of polymer in ther landfills sites n by buring?
2)(c) Each tablet contains the same number of moles of CaCO3 and MgCO3. One tablet
reacted with excess hydrochloric acid to produce 0.24 dm3 of carbon dioxide at r.t.p.
CaCO3 + 2HCl ? CaCl2 + CO2 + H2O
MgCO3 + 2HCl ? MgCl2 + CO2 + H2O
(i) Calculate how many moles of CaCO3 there are in one tablet.
number of moles CO2 = ..............(0.01)
number of moles of CaCO3 and MgCO3 = ..............(0.01)
number of moles of CaCO3 = ..............(0.01)

(ii) Calculate the volume of hydrochloric acid, 1.0 mol /dm3, needed to react with one
tablet.
number of moles of CaCO3 and MgCO3 in one tablet = ..............(0.02)
Use your answer to (c)(i).
number of moles of HCl needed to react with one tablet = ..............(0.02)
volume of hydrochloric acid, 1.0 mol /dm3, needed to
react with one tablet ..............(0.02)
he brackets are my anser cans ome one help?:)

1. in landfill sites they cause visible pollution and burning releases toxic gases. remember to write toxic or poisonous not harmful
2.i)correct
ii)correct
« Last Edit: May 30, 2009, 06:13:36 pm by nid404 »
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Offline a7medokool

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Re: Chemistry Help HERE ONLY !!
« Reply #520 on: May 30, 2009, 06:10:52 pm »
Guys could u help on moles Q nov 2000 Question 1
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Offline MaNa

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Re: Chemistry Help HERE ONLY !!
« Reply #521 on: May 30, 2009, 06:22:28 pm »
Quote from: nid404 on May 30, 2009, 06:07:28 pm
Quote from: ManaH on May 30, 2009, 05:52:10 pm
hey,
umm can some clearify my doubts:)
1)
Q)descirbe the polltuion prblems caused by the disposal of polymer in ther landfills sites n by buring?
2)(c) Each tablet contains the same number of moles of CaCO3 and MgCO3. One tablet
reacted with excess hydrochloric acid to produce 0.24 dm3 of carbon dioxide at r.t.p.
CaCO3 + 2HCl ? CaCl2 + CO2 + H2O
MgCO3 + 2HCl ? MgCl2 + CO2 + H2O
(i) Calculate how many moles of CaCO3 there are in one tablet.
number of moles CO2 = ..............(0.01)
number of moles of CaCO3 and MgCO3 = ..............(0.01)
number of moles of CaCO3 = ..............(0.01)

(ii) Calculate the volume of hydrochloric acid, 1.0 mol /dm3, needed to react with one
tablet.
number of moles of CaCO3 and MgCO3 in one tablet = ..............(0.02)
Use your answer to (c)(i).
number of moles of HCl needed to react with one tablet = ..............(0.02)
volume of hydrochloric acid, 1.0 mol /dm3, needed to
react with one tablet ..............(0.02)
he brackets are my anser cans ome one help?:)

1. in landfill sites they cause visible pollution and burning releases toxic gases. remember to write toxic or poisonous not harmful
2.i)correct
ii)correct
Omg i am so proud of myslef i finally got stichromatery*dances arund the house*
about the harmful ya i know i read the xmainer comment sayin gits not harmful write
TOXIC/ Posioniustnx anyways:)
rep (+)
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Offline ig_kid

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Re: Chemistry Help HERE ONLY !!
« Reply #522 on: May 30, 2009, 06:33:08 pm »
I think that these are the answers but im not sure:

nov 2000 Q1)
d)  0.167 mol
     1.6 mol
     0.267 mol
     15.03g
     79.8%
I hope this helps ;)
« Last Edit: May 30, 2009, 06:37:24 pm by ig_kid »
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #523 on: May 30, 2009, 06:40:53 pm »
Quote from: ig_kid on May 30, 2009, 06:33:08 pm
I think that these are the answers but im not sure:

nov 2000 Q1)
d)  0.167 mol
     1.6 mol
     0.267 mol
     15.03g
     79.8%
I hope this helps ;)

yup that's right......i answered june 2000 earlier.....so tired
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Offline godfather93

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Re: Chemistry Help HERE ONLY !!
« Reply #524 on: May 30, 2009, 07:39:41 pm »
what is stochiochemitry or something like that?
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