CHEMISTRY IGCSE PAPER 6 (8 MAY 2013)

[IGCSE studentsss]

LETS STUDY TOGETHER AND BEST OF LUCK

 

[Crystal Heart]

Best of Luck to u too!!!

 

[Eibo245]

When will the Sample papers be released ????

 

[IGCSE studentsss]

hmmm i m no idea when they will release Eibo245
and yeh thnku Crystal Heart
btw we have to read acid bases and alkali , test for cation and anions and what ?

 

[SAMA_AI]

AM REALLY NERVOUS... WONDER WHTS GONNA COME .. :S BEST OF LUCK TO U GUYS..

 

[IGCSE studentsss]

SAME TO U SAMA_AI

 

[Bharath]

I am having my igcse exams today so can anyone tell about
A mixture of two solids, R and S, was analysed.
Solid R was the water-soluble salt aluminium sulfate, Al
2(SO4)3, and solid S was an insoluble
salt.
The tests on the mixture and some of the observations are in the following table.
Complete the observations in the table.
tests observations
Distilled water was added to the mixture in a
boiling tube.
The boiling tube was shaken and the contents
of the boiling tube fi ltered, keeping the fi ltrate
and residue for the following tests. The fi ltrate
was divided into fi ve test-tubes.
tests on the fi ltrate
(a) Appearance of the fi rst portion of the
fi ltrate. ............................................................ [1]
(b) Drops of aqueous sodium hydroxide were
added to the second portion of the solution
and the test-tube shaken.
Excess aqueous sodium hydroxide was
then added to the test-tube.
...................................................................
............................................................ [3]
(c) Aqueous ammonia was added to the third
portion, dropwise and then in excess.
...................................................................
............................................................ [2]
(d) Dilute nitric acid was added to the fourth
portion of the solution followed by aqueous
silver nitrate. ............................................................ [1]
(e) Dilute nitric acid was added to the fi fth
portion of the solution and then aqueous
barium nitrate. ............................................................ [2]

tests observations
tests on the residue
(f) Dilute hydrochloric acid was added to the
residue.
The gas given off was tested.
Excess aqueous sodium hydroxide was
added to the mixture in the test-tube.
rapid effervescence
limewater turned milky
white precipitate, insoluble in excess

(g) Name the gas given off in test (f).
..................................................................................................................................... [1]
(h) What conclusions can you draw about solid S?
..................................................................................................................................... [2]