QA | Test for Cations (NaOH)
2:31
QA | Test for Cations (Ammonia)
2:29
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@Thisisme714
@Thisisme714 10 күн бұрын
Thank you so much sir. May Allah bless you
@doyourclanwars
@doyourclanwars 14 күн бұрын
mr ng does the table need to be in 3s.f. like stated in the question? (ie at 5:00 mass/g of H is 0.600 in the question but in the table you wrote 0.6)
@BernardNg
@BernardNg 10 күн бұрын
The no. of sf for the values in working is not important. However, in chemical calculation questions, the FINAL answer is conventionally expressed as 3 sf.
@lost_sun-q1d
@lost_sun-q1d 22 күн бұрын
Thank you for making these videos accessible for everyone! I'd like to ask if this video is still suitable to watch for the new syllabus. (specifically combined science chemistry 5088) I was told that iron extraction is no longer in the new syllabus.
@mehar_abd0
@mehar_abd0 23 күн бұрын
love your videos
@oilyomelette
@oilyomelette 26 күн бұрын
The first equation at 3:56 isn't balanced. Shouldn't it be 2CO + O2 -> 2CO2 ..?
@Rehan-o3n
@Rehan-o3n Ай бұрын
Thank you so much sir I struggled so much with mole concept now I understand well and made notes through your vid. Huge respect🙏
@doyourclanwars
@doyourclanwars 14 күн бұрын
same, this video was really well made and i was surprised at how small his channel was!!
@user-qn1vs1qs7i
@user-qn1vs1qs7i Ай бұрын
your videos have helped me more than my chem teacher. thank you so much!
@adnanshahid68
@adnanshahid68 Ай бұрын
Mercury chloride is also insoluble..*
@PlasmaTariq
@PlasmaTariq Ай бұрын
31:29 are we not suppose to balance the electrons
@PlasmaTariq
@PlasmaTariq Ай бұрын
how is ZnO the oxidizing agent when Mgis the one whose oxidation number is increasing from 0 to +2 and its losing 2 of its electrons and its gaining oxygen going from jus mg to mgo
@khubaiblatif2363
@khubaiblatif2363 Ай бұрын
can you link all your slides you teach on in your videos? much appreciated thanks
@mubtasimnawar1494
@mubtasimnawar1494 Ай бұрын
9:41 Umm sir doesnt electrons flow from negative to positive termal(cathode to anode) of a circuit, here it is an electrolytic cell.
@BernardNg
@BernardNg Ай бұрын
@@mubtasimnawar1494 negative to positive refers to the battery powering the cell. One convenient way to remember is that electrons always flow from A to C i.e. anode to cathode (regardless of electrolytic or galvanic cell).
@captaindr527
@captaindr527 Ай бұрын
hey, very good video. I wanted to ask while we were studying the PH scale, you said if we had large amounts of a specific weak acid it might go under its range further explaining what you meant by a rough measure. But I thought that the amount/ concentration didnt effect the strength/PH
@BernardNg
@BernardNg Ай бұрын
@@captaindr527 you are right. The pH of a weak acid solution can go to 1-2 BUT it is still a weak acid as it only ionises partially.
@cornidue
@cornidue Ай бұрын
mr ng could you make more a level videos please 🙏
@BernardNg
@BernardNg Ай бұрын
I wish to too! But I think it will only happen if (1) I go on extended leave from teaching or (2) I go back to teaching A level chemistry. 😅
@AI_MONEY_AI
@AI_MONEY_AI 2 ай бұрын
🤩
@AI_MONEY_AI
@AI_MONEY_AI 2 ай бұрын
🎉
@BernardNg
@BernardNg 2 ай бұрын
ERRATA: 18:23 Q14) positive electrode should be anode so hydroxide ions will be discharged, oxidised to oxygen gas; at negative electrode (cathode), copper(II) ions will be discharged; reduced to copper metal.
@ilavredvelvet
@ilavredvelvet 2 ай бұрын
At 18:23, isn't the cathode the negative terminal, while the anode is the positive terminal for an electrolytic cell?
@chxrrql
@chxrrql 2 ай бұрын
Exactly! The answer in TYS says its C
@kannanaadhithyascss9395
@kannanaadhithyascss9395 2 ай бұрын
Your right, answer should be C.
@BernardNg
@BernardNg 2 ай бұрын
My bad! Positive electrode should be the anode so hydroxide ions will be discharged, oxidised to oxygen gas; at negative electrode (cathode), copper(II) ions will ne discharged; reduced to copper metal. Thanks for alerting!
@celestechee2551
@celestechee2551 2 ай бұрын
Thanks man, u've taught me more than my own teacher ever did 🙏
@jason2302
@jason2302 2 ай бұрын
Not too late
@user-gd6fm3sd1sio
@user-gd6fm3sd1sio 2 ай бұрын
please do organic chem
@ji._n.ler_bandung
@ji._n.ler_bandung 2 ай бұрын
4:51 isnt the answer for that one B, metal and acid reaction,wouldnt C form a by product of nitric acid then making it impure,while the qn ask for pure
@javierfunifuni6232
@javierfunifuni6232 2 ай бұрын
WE GONNA COOK CHEM TMRW
@astralthunder-pzbt
@astralthunder-pzbt 2 ай бұрын
WE GOT THIS CHEM TMMR
@zacharychoo
@zacharychoo 2 ай бұрын
OH LMAO ME TOO
@astralthunder-pzbt
@astralthunder-pzbt 2 ай бұрын
@@zacharychoo LOLLL
@ji._n.ler_bandung
@ji._n.ler_bandung 2 ай бұрын
is there a different between giant molecular structure and giant covalent structure
@BernardNg
@BernardNg 2 ай бұрын
Same!
@staresther
@staresther 2 ай бұрын
Thanks for the video! Studying this topic before my cher teaches me this :)
@aafaq_priv
@aafaq_priv 2 ай бұрын
is the syllabus for 6092 and 5070 same? if it's then u will be helping thousands ♥
@ruoooao
@ruoooao 2 ай бұрын
Cher can u do for paper 2
@twilightlvr
@twilightlvr 2 ай бұрын
thank you so much ure honestly the goat☝️☝️found ur channel arnd 2 months ago and it was honestly LIFE CHANGING. all creds to u if i do well for chem
@shortynotamelody
@shortynotamelody 2 ай бұрын
thank you so much, yourre literally the best teacher!
@shortynotamelody
@shortynotamelody 2 ай бұрын
LMAO they may fall in love
@ke.lisongg
@ke.lisongg 2 ай бұрын
do combined science practical o level
@doyourclanwars
@doyourclanwars 2 ай бұрын
ayo the goat is back
@SiliconSnail
@SiliconSnail 2 ай бұрын
Thanks sir, you have no idea how much help you are! Please never stop making videos 🔥
@ayeshajaved6189
@ayeshajaved6189 2 ай бұрын
Where can I find the videos for this chapter?
@ALOHA_HVITING
@ALOHA_HVITING 2 ай бұрын
Thank you Mr Ng for this! I couldnt find any answer sheet for the specimen paper but thankfully you made this video. I got 35/40 :) Can you do analysis of the paper 2 too? Thank u
@HanasadhanA
@HanasadhanA 2 ай бұрын
Biology please😊
@TriciaBay-vu2ks
@TriciaBay-vu2ks 2 ай бұрын
Can u do analysis of specimen p2 fir 2024 too?
@ke.lisongg
@ke.lisongg 3 ай бұрын
do combined science!!
@rocks5835
@rocks5835 3 ай бұрын
Can you do a combined chem practical paper analysis?
@rocks5835
@rocks5835 3 ай бұрын
Can you do combined chemistry paper analysis?
@ke.lisongg
@ke.lisongg 3 ай бұрын
please do combined science practical answer
@wangzhanfengcchms8814
@wangzhanfengcchms8814 3 ай бұрын
hi can you do physics practical for o level 2024?
@captaindr527
@captaindr527 3 ай бұрын
very good
@tanvirahmed3083
@tanvirahmed3083 3 ай бұрын
so for the new syllabus 2023-2025, there should be another fraction which is "fuel oil" and its uses would be fuel for ships and factories I'm correct
@ilovestrawberries77
@ilovestrawberries77 3 ай бұрын
hi Mr ng! For the 1dm3 mole question, if I got that wrong am I still able to get marks for the following mole questions due to ecf? If my workings are correct
@santhoshraguwoodgrovess9683
@santhoshraguwoodgrovess9683 3 ай бұрын
for the planning qn, i forgot completely about locating agents and then i compared the rf values instead of just the distance of each spot from the start line, is it ok? because i did specify how to calculate the rf value
@doyourclanwars
@doyourclanwars 3 ай бұрын
hi i know im kind of late (3 years late actually) but for the heating/cooling curve at 18:55, do the straight lines need to be of the same length, and do the gradients of the line need to be the same too?
@tanvirwhy
@tanvirwhy 19 күн бұрын
its a rough sketch diagram so no
@MrEpic600
@MrEpic600 3 ай бұрын
I feel so dumb for the acid base titration question I wrote x ~ 2 but I didn’t write (nearest whole number) so there's one mark gone 😭
@barbeque3134
@barbeque3134 3 ай бұрын
How many marks will i minus if i didn’t specify like for each test i wrote i just copied the qa sheet 🙏🏻