Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 4 | Biology
One Answer Below
Anyone can contribute an answer, even non-tutors.
Chemistry. Isn't A correct as well?
Date Posted: 7 years ago
Views: 371
I personally feel both A and B are correct. Unless they are targeting a colour of rly yellowish then B would be a better choice. Honestly since silver iodide is not very yellow i would say its quire pale yellow, but because both are yellow A and B seems the correct answers to me
Yeah so its a case of a very vague question
See 1 Answer
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
While, yes, Silver Iodide is insoluble, it does not form a coloured compound unlike Lead (II). Your hint is the fact that it produces a YELLOW precipitate. Silver forms colourless compounds while Lead (II) compounds are generally yellow.
Date Posted:
7 years ago
Thanks :)
I asked my teacher(and google) about this and she said silver iodide forms yellow precipitate as well... my friend suggested it could be due to the presence of lead ions and the absence of silver ions in tap water but I don't think O lvls should be testing on components of tap water??
Frankly, I have no idea about the O Levels syllabus because I'm not a teacher. (I'm a student) But this question can be done without knowledge of components of tap water simply because it isn't related to that. Just a little advice. In Chemistry, don't overthink anything. It will completely slip past you if you do. (As is what happens to me during Exams)
Ah no what i meant was, silver iodide forms a yellow precipitate as well, not colourless, I checked with both my teacher and google so I'm very sure silver iodide DOES form a yellow precipitate.
I think it's the reactivity series. According to my textbook, a more reactive metal has a higher tendency to form positive ions compared to a less reactive metal. If you remember correctly, lead is more reactive than silver. So I guess lead is the "'more" correct answer in a sense because it is more likely to be present in water than silver ions.
360 Tutoring Program