Ask Singapore Homework?

Upload a photo of a Singapore homework and someone will email you the solution for free.


secondary 4 | Biology
One Answer Below

Anyone can contribute an answer, even non-tutors.

Answer This Question

secondary 4 chevron_right Biology chevron_right Singapore

chemistry ! please help with 4 and 5 !

Date Posted: 1 month ago
Views: 26

See 1 Answer

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Eric Nicholas K
Eric Nicholas K's answer
1706 answers (Tutor Details)
For question 5 the question is VERY subjective.

'Concentrated' can mean very very concentrated or just concentrated.

My personal answer is NONE of the options; I am expecting zinc to be at the cathode and chlorine to be at the anode since I assume that the concentration of the H+ and the OH- is way too small. Again, this depends on how concentrated the solution is.

Ironically, I saw this question elsewhere and their given answer is also none of the four options provided here.
Eric Nicholas K
Eric Nicholas K
1 month ago
If I really have to pick one of the four options, my closest answer for question 5 is A though. Zinc is still several levels above H in the reactivity series and should not get discharged (assuming the solution is NOT that concentrated), whereas OH and Cl are not too far off each other in the discharging series, so both can get discharged.