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First Name : Thordia
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URL : http://hk.geocities.com/ngthordia
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Comment : Miss poon~
"Everyone thought me lucky!",
here, i know that "me" replace "that I was"
but actully, I don't really understand, I don't know why "me" can replace "that I was", Can u explain it for me and give me some examples??
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First Name : johnny_Leung
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URL : NO ar
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Comment : 我想問TAS中的calculation
"compared with the literature value",要唔要reason
仲有discussion中
"Account for the differences if any, in the changes in mass of the cathode and anode respectively after electrolysis" 點解?
係唔係問點解change in mass of catho
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First Name : Yomi
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URL : http://butterflyomi.netfirms.com
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Comment : Miss NG,我想知呢..做tas既時候..駛唔駛寫個表寫返個2邊Cu之前同之後既重量比你睇呀?咁current同voltage同你比個既唔同,駛唔駛寫返出黎呀?
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First Name : tsui ka man
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URL :
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Comment : 假如tas有error，要唔要講有error的原因？假如我做咗兩次experiment，兩次data要唔要mention？
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First Name : Student
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URL :
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Comment : Miss Ng, report is it only need to answer all the answer ga ja? is there any other things need to write in the report?? thanks
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First Name : Miss Ng
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Comment : Dear Johnny Leung,
There is quite a bigh difference between AS & AL Chem. You can check the 2 syllabus esdiffer a lot. There is no harm to do the AS past papers after asking me whether they are out of AL syllabus.
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First Name : Miss Ng
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Comment : Dear Johnny,
If your answer is very much different from literature value, you have to explain. Theoretically, the increase in mass in cathode = decrease in mass in anode. Practically, that may not be true, please explain.
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First Name : Miss Ng
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Comment : Dear Yomi,
All you said are required.
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First Name : Miss Ng
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Comment : Dear Tsui Ka Man,
It is not necessary to discuss the errors if there is no direct connection with the discussion Q.
Please mention your most sucessful result as I assume that your failure is due to poor manipulation skill.
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First Name : Miss Ng
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Comment : Dear Student,
Basically, no need to include 'other things'.
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First Name : 6B No.1
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Comment : ..我想問哥羅芳(chloroform)個chemical formula係乜..唔記得左
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First Name : Miss Ng
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Comment : Dear 6B No.1,
CHCl3, trichloromethane
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First Name : student
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Comment : Miss Ng,in Discussion Q.1,'Account for the differences,if any,in the changes in mass of the cathode and anode repectively after electrolysis.' if change in mass of the cathode is really = change in mass of the anode, then what can i answer ? thanks.
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First Name : Miss Poon
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Comment : Dear Thordia, In your e.g.,'I was' is better because 'though (that)' is followed by a clause. But sometimes there is no strict rule, just like 'Who is knocking at the door?' 'Oh, Peter it's me.' Grammatically, it should be 'It's I.'
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First Name : chan ting
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Comment : dear miss ng,
i 'd like to ask should i measure the length and width of the copper in order to find the thickness of copper in discussion(no.2)? if so, i am afraid i forget to measure it!!
then, may i measure it again? what should i do? moreover, if my
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First Name : chan ting
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Comment : dear miss ng,
moreover, if my calculation of the quantity of electricity of one mole of electrons is differ about 11000C when compared with the literature value, then shall i explain why?
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First Name : chan ting
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Comment : dear miss ng,
how about the error of the experiment even the reasons of the changes in mass of the cathode and anode respectively after electrolysis??
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First Name : johnny_Leung
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Comment : thanks, Miss Ng
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First Name : chan ting
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Comment : dear miss ng,
besides, does the chemicals has the period of time for the best usage?? if so, does it has any specific changes when it has passed for a long time?
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First Name : chan ting
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Comment : dear miss ng,
thank you for answering the all questions!!
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First Name : johnny_Leung
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Comment : 我想問water 的density 在幾多度最高??
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First Name : 6B No.1
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Comment : To Johnny ...
好似係4度
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First Name : johnny_Leung
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Comment : why 4 oC
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First Name : Miss Ng
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Comment : Dear johnny leung,
As you know substance contract when temperature decrease as the particles vibrate less vigorously as lower temperature. That's why water contract as temp falls until 4 C. Ice start to form approaching 0 C. And ice got very loose struct
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First Name : Miss Ng
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Comment : & ice got very loose structure, that's why the density of water decrease again from 4 C to 0 C.
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First Name : johnny_Leung
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Comment : but at 1oC or 2oC it still is water ,why the density will not increase?
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First Name : S.F. Heung
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Comment : 我想問在notes 第3課,當有高壓時,氣體吸收energy而使electron從第一層跳到第二層,然後會unstable,electron跳回第一層,energy會release.但是energy除了從光能release,會否從其他途徑release呢?
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First Name : johnny_Leung
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Comment : 仲有radiation ma
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First Name : Miss Ng
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Comment : Dear Johnny,
Use your imagination, at temp between 4 oC and 0 oC water molecules will orientate themselves to become ice structure. As ice floats on water, you can predict the structure of ice is a loose structure.
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First Name : Miss Ng
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Comment : Dear SF Heung,
Up to this moment, I'm not sure whether light (=radiation) is the only form of energy released during electronic transition. I guess ...... energy may also be released as thermal energy.
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First Name : chanting(春天)
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Comment : dear miss ng,
shall i wirte down the possible errors of tas2 in point form in the report?
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First Name : collins
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Comment : how to find the relative isotopic mass of an element?
in syringe method , why if the boiling point voatile liquid 70 the vol. of the vapour become smaller than the expected result ,then the no. of mole of it become smaller?
thx
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First Name : Student
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Comment : dear miss ng, what is the formula of tetrachloromethane? thx!
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First Name : Miss Ng
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Comment : Dear Chanting,
It's better to use paragraph form.
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First Name : Miss Ng
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Comment : Dear Collins,
Practically, you can use mass spectrometer to find out the isotopic masses. Using gas syringe method, we can only find the relative atomic mass or molecular mass, but not individual isotopic masses.
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First Name : Miss Ng
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Comment : Dear Collins,
I can hardly understand the second part of your question. I try to answer as far as I can guess from your Q!
According to Gay Lussac Law, volume ratio = mole ratio if gas volumes are measured at same temp and pressure. If vol measured is s
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First Name : Miss Ng
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Comment : Dear Collins,
....if the gas vol measured is smaller than expected due to experimental errors. The no. of mole of the gas will also be smaller than expect.
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First Name : Miss Ng
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Comment : Dear all,
By the way, can anyone answer Student's Q? Pls.
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First Name : a君
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Comment : Ms Ng
in your 網上教室--Self Test 1--Answer:
A: 52.7 mL
should be 53.7mL嗎?
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First Name : Miss Ng
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Comment : a 君,
The Q has been amended. The answer is 52.7 ml.
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First Name : Thordia
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Comment : Miss Poon~~
1) For Paper 1, if it's a friendly letter, is it acceptable that I write "wanna", "gonna" sth like that in the letter?
2) For Paper IV, is it ok that I ask the interviewee to spell the word or ask her to repeat her answers again if I can't
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First Name : Thordia
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Comment : Miss Poon(continue the last message)~~if I can't
hear clearly? Any mark will be deducted if I do that like this morning I interviewed you? Ever since the 2nd exam of F.4, I felt that I aften can't hear the interviewee clearly~
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First Name : johnny_Leung
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Comment : Miss Ng,請問可唔可以給quiz 的answer我0地,咁可以方便溫書ma
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First Name : Yomi
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Comment : I want to know how to get A/A+ in tas.
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First Name : Miss Ng
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Comment : Dear johnny leung,
The answer has been already discussed in detail. It is not necessary for you to get an extra copy if you did the correction in the class.
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First Name : collins
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Comment : 1. can someone explain Faraday's 2nd law of electricitsis.pls give explain?
(can it apply to chemical reaction?)
2. the oxide of metal M decomposes on heating to give metal M and oxygen only. after heating the mass of the oxide decrease by 6.9% . what
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First Name : 人一個
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Comment : Why今年學校收外校repeater??????
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First Name : collins
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Comment : 3.hydrated iron (II)sulphate ,FeSo4.xH2O,contains 20.14% of iron by mass. what is its formula?[RAM: H=1.008,O=16,S=32.1,Fe=55.85]
(can i do in this way 1st ,let the mass ofthe sabatance is 100g ,find the mass of Fe and mass of SO4,then we know the mass
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First Name : collins
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Comment : 1./what is backward titration?
2./in mass spectroscope of methane,how to predict how many ions can be formed?[there are 6 ions formed,why?]
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First Name : johnny_Leung
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Comment : Dear Miss Mg
deionized water=? and how to make it??
thanks
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