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

Qualification => IGCSE/ GCSE => Reference Material => Topic started by: omar abbassy on June 11, 2009, 12:27:23 pm

Title: helpful chemistry remarks?
Post by: omar abbassy on June 11, 2009, 12:27:23 pm

i think most ppl know them but just in case:
*all nitrates are soluble
*all chlorides are soulble except silver chloride and lead chloride
*all sulphates are soluble except barium sulphate and lead slphate
*all hydroxides and carbonates are INSOLUBLE except sodium,potassium and ammonium salts
*all oxides are INSOLUBLE except sodium potassium and calcium
*impure water has a lower melting point and higher boiling point
*ionic compounds are more soluble than covalent
*distillation=evaporation then condensation
*calcium carbonate reacts with acid rain= co2
*cuso4.5h20+heat=dehydration+endothermic,colour change from blue to white
*when a metal nitrate is heated with aqueous sodium hydroxide then heated ammonia produced
*copper reacts with CONCENTRATED sulphuric acid to give so2
hope i helped

Title: Re: helpful chemistry remarks?
Post by: ButterFlyEffect on June 11, 2009, 01:10:28 pm

Thanq XD

Title: Re: helpful chemistry remarks?
Post by: Q80BOY on June 11, 2009, 01:13:57 pm

great help omar !!

+REP

keep it up  ;)

Title: Re: helpful chemistry remarks?
Post by: esso on June 11, 2009, 01:29:22 pm

nice help...
keep it up...
good wrk=+rep
Thanks,,

Title: Re: helpful chemistry remarks?
Post by: esso on June 11, 2009, 02:59:23 pm

add one calcium sulphate is insoluble....