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)
@BernardNg10 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-q1d22 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_abd023 күн бұрын
love your videos
@oilyomelette26 күн бұрын
The first equation at 3:56 isn't balanced. Shouldn't it be 2CO + O2 -> 2CO2 ..?
@Rehan-o3nАй 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🙏
@doyourclanwars14 күн бұрын
same, this video was really well made and i was surprised at how small his channel was!!
@user-qn1vs1qs7iАй бұрын
your videos have helped me more than my chem teacher. thank you so much!
@adnanshahid68Ай бұрын
Mercury chloride is also insoluble..*
@PlasmaTariqАй бұрын
31:29 are we not suppose to balance the electrons
@PlasmaTariqАй 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
@khubaiblatif2363Ай бұрын
can you link all your slides you teach on in your videos? much appreciated thanks
@mubtasimnawar1494Ай 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.
@BernardNgАй 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).
@captaindr527Ай 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
@BernardNgАй 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.
@cornidueАй бұрын
mr ng could you make more a level videos please 🙏
@BernardNgАй 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_AI2 ай бұрын
🤩
@AI_MONEY_AI2 ай бұрын
🎉
@BernardNg2 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.
@ilavredvelvet2 ай бұрын
At 18:23, isn't the cathode the negative terminal, while the anode is the positive terminal for an electrolytic cell?
@chxrrql2 ай бұрын
Exactly! The answer in TYS says its C
@kannanaadhithyascss93952 ай бұрын
Your right, answer should be C.
@BernardNg2 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!
@celestechee25512 ай бұрын
Thanks man, u've taught me more than my own teacher ever did 🙏
@jason23022 ай бұрын
Not too late
@user-gd6fm3sd1sio2 ай бұрын
please do organic chem
@ji._n.ler_bandung2 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
@javierfunifuni62322 ай бұрын
WE GONNA COOK CHEM TMRW
@astralthunder-pzbt2 ай бұрын
WE GOT THIS CHEM TMMR
@zacharychoo2 ай бұрын
OH LMAO ME TOO
@astralthunder-pzbt2 ай бұрын
@@zacharychoo LOLLL
@ji._n.ler_bandung2 ай бұрын
is there a different between giant molecular structure and giant covalent structure
@BernardNg2 ай бұрын
Same!
@staresther2 ай бұрын
Thanks for the video! Studying this topic before my cher teaches me this :)
@aafaq_priv2 ай бұрын
is the syllabus for 6092 and 5070 same? if it's then u will be helping thousands ♥
@ruoooao2 ай бұрын
Cher can u do for paper 2
@twilightlvr2 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
@shortynotamelody2 ай бұрын
thank you so much, yourre literally the best teacher!
@shortynotamelody2 ай бұрын
LMAO they may fall in love
@ke.lisongg2 ай бұрын
do combined science practical o level
@doyourclanwars2 ай бұрын
ayo the goat is back
@SiliconSnail2 ай бұрын
Thanks sir, you have no idea how much help you are! Please never stop making videos 🔥
@ayeshajaved61892 ай бұрын
Where can I find the videos for this chapter?
@ALOHA_HVITING2 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
@HanasadhanA2 ай бұрын
Biology please😊
@TriciaBay-vu2ks2 ай бұрын
Can u do analysis of specimen p2 fir 2024 too?
@ke.lisongg3 ай бұрын
do combined science!!
@rocks58353 ай бұрын
Can you do a combined chem practical paper analysis?
@rocks58353 ай бұрын
Can you do combined chemistry paper analysis?
@ke.lisongg3 ай бұрын
please do combined science practical answer
@wangzhanfengcchms88143 ай бұрын
hi can you do physics practical for o level 2024?
@captaindr5273 ай бұрын
very good
@tanvirahmed30833 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
@ilovestrawberries773 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
@santhoshraguwoodgrovess96833 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
@doyourclanwars3 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?
@tanvirwhy19 күн бұрын
its a rough sketch diagram so no
@MrEpic6003 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 😭
@barbeque31343 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 🙏🏻