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21.8.11

Chemistry Terminology & Concepts


STPM-Form-6 -

20.8.11

Chemical Periodity - A levels note


Chemical periodicity -


Hey guys, although this is A levels notes, I think its quite useful. Have a look :)

9.8.11

STPM Past Year - Pengajian Am (Paper 2,Perlis)


STPM Trials 2009 PA Paper 2 _Perlis_ -

STPM Past Year - Pengajian Am (Paper 1, Perlis)


STPM Trials 2009 PA Paper 1 _Perlis_ -

STPM Past Year - Pengajian Am (Paper 1)


PA_kertas1

3.8.11

Inorganic Chem MCQ question

Which of the following properties does not apply to modern ceramics?

A.
High melting point

B.
Application in engineering

C.
Corrode readily

D.
Very hard
  

Which of the following statements about aluminium is not true?

A.
It is extracted by electrolysis.

B.
Its chloride is covalent

C.
It is soluble in concentrated nitric acid

D.
It is soluble in sodium hydroxide solution

With concentrated nitric acid, the aluminium metal is being oxidised causing the thickening of the aluminium oxide layer.

Which of the following statements is true of dimer Al2Cl6?

A.
It is an ionic compound.

B.
Aluminium atom undergoes sp2 hybridisation.

C.
It is a white solid which melts when heated.

D.
There are two coordinate covalent bonds in the molecule.


When sodium sulphide is added to an aqueous solution of aluminium chloride, the gas evolved is

A.
Cl2

B.
CO2

C.
H2S

D.
HCl


2[Al(H2O)6]3+ (aq) + 3S2- (aq) → 2Al(OH)3.3H2O (s) + 3H2S(g)

Why is the aqueous solution of an aluminium salt acidic?

A.
[Al(H2O)6]3+ ion receives a proton in aqueous solution.

B.
[Al(H2O)6]3+ ion donates a proton in aqueous solution.



C.
[Al(H2O)6]3+ ion disproportionate and produces H+ (aq) ions.

D.
Acidic [Al(H2O)6OH]2+ ions are produced in solution.


In the the salt solutions the complex aluminium ion behave accordingly:
[Al(H2O)6]3+ (aq) + H2O (l) ↔ [Al(H2O)5(OH)]2+ + H3O+ (aq)

 stumbled upon this on the net while surfing (: