Qualification > Sciences

CHEMISTRY PAPER 1 HERE

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sweetie:
oct05 que.32
may06 que.19
oct06 que.5

can any1 plzzzzzz xplain ans. 2 dese que"s

winnie101:
hi
does anyi know why the ans to q29, 2004jun is C

cool_dude:
u guys..
help me..

ppr 1,june04, 32..
why would the screws be the aluminium?..
aluminium would never corrode..because it forms oxide layer?

esso:

--- Quote from: sweetest angel on June 11, 2009, 12:32:47 pm ---
--- Quote from: esso on June 11, 2009, 12:23:13 pm ---i need help in this question <

 Three reactions used in the manufacture of sulphuric acid are shown.
1 S + O2 ? SO2
2 2SO2 + O2 ? 2SO3
3 SO3 + H2O ? H2SO4
Which of these reactions are redox reactions?
A 1 only
B 3 only
C 1 and 2 only
D 2 and 3 only

--- End quote ---
2 and 3?
i saw this question be4...can u tell me which year please?

--- End quote ---

its in may june 2007 .... but can u explain it ????

girl_92:

--- Quote from: notty_me on June 11, 2009, 12:41:00 pm ---oct05 que.32
may06 que.19
oct06 que.5

can any1 plzzzzzz xplain ans. 2 dese que"s

--- End quote ---
for the first one its lime bcoz lime is calciumcarbonate bcoz it consists of calcium which is highly reactive n will not decompose

for the second metals below hydrogen will not react with acids n copper is below hydrogen all the others will react
n for the last one its C
the 35 n 37 are isotopes of chlorine n the 18 is argon chk the periodic table

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