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Chemistry: Post your doubts here!

GCE As and a level

GCE As and a level

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♣♠ Magnanimous ♣♠

♣♠ Magnanimous ♣♠

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GCE As and a level said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w07_qp_1.pdf
Q9 , Q26 . Q37
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_qp_11.pdf
Q21 , 23 , 32
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_qp_12.pdf
Q20 , Q25
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s07_qp_1.pdf
Q25,26,38
PLZ GUYS
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ZaqZainab do try please
 
ZaqZainab

ZaqZainab

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♣♠ Magnanimous ♣♠ said:
ZaqZainab do try please
Click to expand...
i am really tired right now and i am in no condition of solving anyways i see most of the questions are sloved already by memebres
Q9 By calculation, it can be found out that two mole of the salt reacts with 1 mole of sulfite. The half equation for the oxidation of sulfur shows us that 2 electrons are lost in the process. This means that the metal in the salt must be reduced and two electrons must be gained. Since two moles of metal ions reacts , the oxidation number decreses from +3 to +2, so that two metal ions can gain a total of two electrons to balance it out.
Q26 Halogenalkane react with NaCN not HCN We use HCN (with trace NaCN) to step up carbonyls. We use NaCN or KCN to step up halogen alkanes.
Q37
1. (Correct) CaO + ND4Cl --> CaCl2 + D2O + ND3
2. (Correct) CH3CN + NaOD + D2O --> CaCOONa + ND3
3. (wrong) NaOD + NDH3Cl --> NaCl + D2O + NH3 or NaCl + DHO + NDH2
 
♣♠ Magnanimous ♣♠

♣♠ Magnanimous ♣♠

Messages
6,392
Reaction score
26,955
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ZaqZainab said:
i am really tired right now and i am in no condition of solving anyways i see most of the questions are sloved already by memebres
Q9 By calculation, it can be found out that two mole of the salt reacts with 1 mole of sulfite. The half equation for the oxidation of sulfur shows us that 2 electrons are lost in the process. This means that the metal in the salt must be reduced and two electrons must be gained. Since two moles of metal ions reacts , the oxidation number decreses from +3 to +2, so that two metal ions can gain a total of two electrons to balance it out.
Q26 Halogenalkane react with NaCN not HCN We use HCN (with trace NaCN) to step up carbonyls. We use NaCN or KCN to step up halogen alkanes.
Q37
1. (Correct) CaO + ND4Cl --> CaCl2 + D2O + ND3
2. (Correct) CH3CN + NaOD + D2O --> CaCOONa + ND3
3. (wrong) NaOD + NDH3Cl --> NaCl + D2O + NH3 or NaCl + DHO + NDH2
Click to expand...
MYLORD and GCE As and a level
 
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