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Also, how do you draw the dot and cross diagram for elements like iodine and krypton?
For BT1 2010 question B3 (a), is separating funnel accepted?
One last thing, why can I only view the first page of the answers on the LMS?
Thanks :)
For BT2 2009 question B2 (d):
Explain why simple distillation should not be used to recover a sample of copper (II) sulfate from it's solution.
Ans: in simple distillation we are collecting the pure water as distillate not the solid
My ans: when it evaporates and reaches the condenser it will condense back into a liquid so no solid can be recovered.
Is my ans correct? Thanks!
Ms Chen, this is Jia Xuan. For the mock block test paper, 2011 block test 1, there can be a lot of answers for question B1 right? can my answers be a) Carbon dioxide and Neon, b) hydrogen and carbon monoxide, c) mercury and nitrogen?
Yes jiaxuan there are many possibilities and ans. Yes yr answer for a and b is correct but qn c is asking for liq state and so mercury is liq but nitrogen is not liq. Nitrogen is in the gas state. A possible ans is water.
Hi Ms Chen, for Q4 of 2010 Class Test 3 (section A), why is the option A (decanting)? It says that X has a density of 1.5kg/m3, but decanting requires the solid to have higher density than water, which is 1000kg/m3. Thanks! (:
hi ms chen(: for 2010 block test 1, can the answer for question 9 be D also? for 2010 block test 3, i think that question 4 is quite weird. because 1.5kg/m^3 is 0.0015g/cm^3, and that's less dense than water. in 2011 block test 1, i dont understand question 2. what does "combustion reaction" mean? i thought that anything to do with heating is combustion.
thanks(:
Comments (Show all 69)
Rachel Kwok said
at 9:33 am on May 20, 2011
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=n3Usa6mOkhM
Wei Ai Chrystel Ng said
at 9:39 am on May 20, 2011
This is a video about separation by magnetic attraction, separating iron from a mixture of salt and sand. :)
limyi:) said
at 9:36 am on May 20, 2011
Another video!!!!
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=vcwfhDhLiQU
And,
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=rF4scC54FfQ
All on separation techniques!
Lee xin min said
at 9:36 am on May 20, 2011
http://www.youtube.com/watch?v=cL6I1O1YHH0&feature=youtube_gdata_player
Talks about the difference of compounds and mixtures using iron and sulphur
Songxueqi said
at 9:38 am on May 20, 2011
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=QSZ-3wScePM
This is a video on the reactivity of all group 1 metals other than francium :)
- Xue Qi, Yi Xi, Shu Qi, Emily
Rachel Kwok said
at 9:39 am on May 20, 2011
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=u5MBYhBdpdY
I love this cool explode-y video
Yeng Mun said
at 9:39 am on May 20, 2011
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=l8-y0OR66C8
This is a video of elements, compounds and mixtures!
-Ooi Shu Min, Oan Jia Xuan, Mandy Foong Shi Yun, Chiang Yeng Mun
Jane said
at 9:39 am on May 20, 2011
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=pO0X6fVre1I
This is awesome!!:):) MUST WATCH!! COOL!
This is nice too, very easy to understand
http://m.youtube.com/#/watch?desktop_uri=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DqmgE0w6E6ZI&v=qmgE0w6E6ZI&gl=US
weixuan@nygh.moe.edu.sg said
at 9:42 am on May 20, 2011
Video on atoms
Jane said
at 9:39 am on May 20, 2011
That was by Wendy, Ling Ern and me
The Walking Chocolate said
at 9:40 am on May 20, 2011
Summary on atoms and molecules. The water droplet is cute~
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=qmgE0w6E6ZI
limyi:) said
at 9:40 am on May 20, 2011
Do you like justin bieber? :):) if yes, watch this please.
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=WvU6ppmEuEk
Watch!!!
Hui Yi :D said
at 9:42 am on May 20, 2011
http://m.youtube.com/?client=mv-google&rdm=4mltwau3b#/watch?v=VmZXa8tgnRU
Explains Reverse Osmosis.
Rachel Kwok said
at 9:43 am on May 20, 2011
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=uixxJtJPVXk
Rachel Kwok said
at 9:43 am on May 20, 2011
The video says it all
Hui Yi :D said
at 9:43 am on May 20, 2011
http://m.youtube.com/?client=mv-google&rdm=4mltwau3b#/watch?v=E-fs9OwE9Y0
A GERMAN video on sublimating iodine <3
limyi:) said
at 9:45 am on May 20, 2011
This ones cool too!
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=KMsF-_5a5A8
Rachel Kwok said
at 9:45 am on May 20, 2011
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=infM_kFc2gU
DIY bomb. I wanna try!!!!!!
Jane said
at 9:46 am on May 20, 2011
Molecules in solids:
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=AhBGMdhJ4nA
Molecules in liquids:
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=hxqEUy9Dusk
Pan Xin-Min said
at 9:48 am on May 20, 2011
Filtration stuff. Not very interesting though.
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=xaDfOWUVlQA
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/profile?user=TheGCSEChemistry
Sublimation
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=4fAOI6BeMZY
Crystallization
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=rF4scC54FfQ
Fractional distillation
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=0x2-8dedmE4
Magnetic attraction
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=cs6iJavFJiI
Simple distillation
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=3JlIPnyrZMw
Paper chromatography
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=IRZ4lHEe1DI
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=uxP9qwpUBBU
Evaporation
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=O87PYJgiw1
In general
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=uxP9qwpUBBU
By Seng Yu Ying, Pan Xin-Min, Lee Tsinrong and Teresa Ng
weixuan@nygh.moe.edu.sg said
at 9:50 am on May 20, 2011
112: thank you for yr contributions and enthusiasm in looking for the videos! great job!:)
please continue to search for videos if u wish to.
Ms Chen
The Walking Chocolate said
at 6:55 pm on May 21, 2011
Hi Ms Chen, for BT2 2009, why is question 1 option D and not C, and question 4 D and not B? Thanks o^^o
The Walking Chocolate said
at 11:19 am on May 22, 2011
Also, how do you draw the dot and cross diagram for elements like iodine and krypton?
For BT1 2010 question B3 (a), is separating funnel accepted?
One last thing, why can I only view the first page of the answers on the LMS?
Thanks :)
The Walking Chocolate said
at 11:46 am on May 22, 2011
Sorry for spamming you with questions >< are transition elements solid, liquid or gas? :)
The Walking Chocolate said
at 11:50 am on May 22, 2011
Why is 2011 BT1 question 2 option B?
The Walking Chocolate said
at 6:00 pm on May 27, 2011
For BT2 2009 question B2 (d):
Explain why simple distillation should not be used to recover a sample of copper (II) sulfate from it's solution.
Ans: in simple distillation we are collecting the pure water as distillate not the solid
My ans: when it evaporates and reaches the condenser it will condense back into a liquid so no solid can be recovered.
Is my ans correct? Thanks!
The Walking Chocolate said
at 6:06 pm on May 27, 2011
Can I put "solute" instead of sample?
The Walking Chocolate said
at 2:11 pm on May 30, 2011
If they ask for the property of, say, sodium, can I say that it is a metal?
weixuan@nygh.moe.edu.sg said
at 11:45 am on May 31, 2011
Hi Jeanette, I replied yr emails and I will see you bak in school.
Jia Xuan said
at 10:01 pm on May 30, 2011
Ms Chen, this is Jia Xuan. For the mock block test paper, 2011 block test 1, there can be a lot of answers for question B1 right? can my answers be a) Carbon dioxide and Neon, b) hydrogen and carbon monoxide, c) mercury and nitrogen?
weixuan@nygh.moe.edu.sg said
at 12:56 pm on May 31, 2011
Yes jiaxuan there are many possibilities and ans. Yes yr answer for a and b is correct but qn c is asking for liq state and so mercury is liq but nitrogen is not liq. Nitrogen is in the gas state. A possible ans is water.
weixuan@nygh.moe.edu.sg said
at 11:44 am on May 31, 2011
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=l8-y0OR66C8
This is a video of elements, compounds and mixtures!
-Ooi Shu Min, Oan Jia Xuan, Mandy Foong Shi Yun, Chiang Yeng Mun
weixuan@nygh.moe.edu.sg said
at 11:46 am on May 31, 2011
http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=tk5xwS5bZMA
This is a video on Group 7 elements (Halogens) reactiosn with metals.
-Xue Qi, Shu Qi, Yi Xi and Emily
Chi Yan ♥ said
at 5:51 pm on Jun 7, 2011
Thanks Ms Chen. (:
Chi Yan ♥ said
at 5:54 pm on Jun 7, 2011
Hello Ms Chen, what is the purpose of the fractionating column in the fractional distillation setup? Thanks. (:
Chi Yan ♥ said
at 4:45 pm on Jun 8, 2011
Hi Ms Chen, for Q4 of 2010 Class Test 3 (section A), why is the option A (decanting)? It says that X has a density of 1.5kg/m3, but decanting requires the solid to have higher density than water, which is 1000kg/m3. Thanks! (:
Ling Ern said
at 6:04 pm on Jun 10, 2011
Hi Ms Chen, for 2011 block test 1, B3 question b, why is the answer 35 protons?
Jane said
at 9:25 am on Jun 25, 2011
hi ms chen(: for 2010 block test 1, can the answer for question 9 be D also? for 2010 block test 3, i think that question 4 is quite weird. because 1.5kg/m^3 is 0.0015g/cm^3, and that's less dense than water. in 2011 block test 1, i dont understand question 2. what does "combustion reaction" mean? i thought that anything to do with heating is combustion.
thanks(:
The Walking Chocolate said
at 11:07 am on Jun 26, 2011
hi pee buddehhhhhhhhhhhhhhhhhhh :D i think combustion refers to burning by oxygen ONLY (:
Yushan said
at 6:49 pm on Jul 13, 2011
Hi Ms Chen, I am yushan from 104=) Can we ask you questions on this page too?
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