IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: angel_ak on June 01, 2011, 08:37:14 am

Title: as chem help!
Post by: angel_ak on June 01, 2011, 08:37:14 am

which gas closely approaches ideal behaviour at room temp and pressure?
ammonia
carbon dioxide
helium
oxygen

Title: Re: as chem help!
Post by: elemis on June 01, 2011, 09:06:32 am

I'll give you a hint :

To be an ideal gas you must have little or no intermolecular forces and be as small as possible.

Which one fits the bill ?

Think.

Title: Re: as chem help!
Post by: angel_ak on June 01, 2011, 09:12:29 am

helium!?

Title: Re: as chem help!
Post by: angel_ak on June 01, 2011, 09:13:19 am

can i go on for more qs?
have my ppr kal =/

Title: Re: as chem help!
Post by: angel_ak on June 01, 2011, 09:22:55 am

ammonium nitrate NH₄NO₃, can decompose explosively when heated.

NH₄NO₃ ----------------> N₂O + 2H₂O

what are the changes in the oxidation num of the two N atoms in NH₄NO₃ when this reaction proceeds?

1. -2, -4
2. +2, +6
3. +4, -6
4. +4, -4

Title: Re: as chem help!
Post by: elemis on June 01, 2011, 09:49:41 am

We have a dedicated thread for chemistry :


https://studentforums.biz/sciences-149/chemistry-doubts-10366/ (https://studentforums.biz/sciences-149/chemistry-doubts-10366/)