Qualification > Sciences
CHEMISTRY PAPER 1 HERE
aquarian93:
--- Quote from: madee on June 11, 2009, 03:04:46 pm ---
--- Quote from: nid404 on June 11, 2009, 03:01:20 pm ---
--- Quote from: aquarian93 on June 11, 2009, 02:57:39 pm ---and guys doesnt sodium oxide hav a pH above 7 (metal oxide)
den how cum the answer in nov 05, question 17 is C ???
--- End quote ---
Read the question correctly. Sodium oxide, when in solution it forms OH-ions which give the pH for the solution and changes pH of water(7) to 12
Hence C
--- End quote ---
yea srry i rote it according to tht sodium i didnt read the que properly
--- End quote ---
its K :)
Q80BOY:
hey guys ...
ive got a question from nov 2001
Page 4, Question 6 ...
Neon has 10 e- and Sodium has 11 e- which makes the answer C, but the mark scheme says its D ...
help !!
girl_92:
--- Quote from: Q80BOY on June 11, 2009, 03:18:03 pm ---hey guys ...
ive got a question from nov 2001
Page 4, Question 6 ...
Neon has 10 e- and Sodium has 11 e- which makes the answer C, but the mark scheme says its D ...
help !!
--- End quote ---
dude it is sodium ion tht means it has already lost one electron this makes it 10 electrons
aquarian93:
--- Quote from: Q80BOY on June 11, 2009, 03:18:03 pm ---hey guys ...
ive got a question from nov 2001
Page 4, Question 6 ...
Neon has 10 e- and Sodium has 11 e- which makes the answer C, but the mark scheme says its D ...
help !!
--- End quote ---
it has to be D cuz sodium atom has10, cuz Na+ and loses one electron. so 8 on the outer and none on the last.
neon has to hav complete shells cuz its gr.8
hope i helped
sundars:
Its D since sodium ion is asked.
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