Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
Vin:
--- Quote from: the golden girl on May 07, 2010, 04:29:05 pm ---okay i'll give u all the questions that i have doubt in that r related to oxides ,k ? ....but plz do explain cuz i kno what the answers r cuz of the ms ..,k?
well herei go :
jun2001 question 14)
nov 2001 question 21)
nov 2003 q 16) ..19) and 26)
jun 2004 q 9)..14)..26)
nov q 11)
i kno that's alot .....well my bro is pain in the neck .hence i'll sign out right now ...but i'll be back abd 2 hours later or smthn ..... and i really would apprectiate it if u would have answered me by then ...
thx alot !!!
--- End quote ---
june 04
9) A ..has to be only one showing a correct formula for lead(II)Nitrate!! Pb(NO3)2
14) D ..hydrogen in a fuel always combines with air
26) A .. z least reactive as it occurs naturally as the metal
nov 04
11) A ..copper oxidizes when heated in air
will take time to ans others havta hav my dinner!..:)
Ghost Of Highbury:
june 2001 q14 - C. the gas released is obviously hydrogen because the metal will displace hydrogen from steam. steam is reduced because the H has gained an electron.
nov 2001 - 21 - A. Calcium oxide + HCl --> Calcium chloride + water. litmus red (acid) to blue (excess CaO)
nov 2003 - 16) B, lead oxide is reduced, lead remains, H20 (steam) dries up and adds to the drying agent.
19) C, neutralization because of acid + base. filtration at last.
26) B, hydrogen will displace copper.
june 04 - 9 - A, perfectly balanced
14) D - combustion
26) A. electrolyzing is used for very reactive metals. unreactive metals occur naturally
Vin:
nov 03
16) B .. lead oxide is decomposed hence mass decreases and O2 is displaced on the right so ova there mass inc.
19) C .. MgSO4 is a salt formed by reacting a base and an acid, they neutralize to form a salt thn the solution has to be filtered to seperate
26) B .. only copper can be displaced by Hydrogen..study reactivity series..
i feel these are too easy..im happy.. evn i had a lot of probs solvin such ques ..:)
The Golden Girl =D:
thx alot , both of u !! ....... i feel like i awe u alot .....really thx alot !!
~VIN1094~ - i just want to know how did u get to feel they're too easy ..in other words , what did u do to feel so not worried/so comfortable with chemistry paper 1 or even such questions?...
thx in advance
Ghost Of Highbury:
--- Quote from: the golden girl on May 07, 2010, 07:13:43 pm ---thx alot , both of u !! ....... i feel like i awe u alot .....really thx alot !!
~VIN1094~ - i just wanna kno how did u get ot feel there too easy ..in other words , what did u do to feel so not worried/so comfortable with chemistrey paper1 or even such question?...
thx in advance
--- End quote ---
ur welcome
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