Chemistry: Post your doubts here!

[Thought blocker]

Please explain Question 5(b), Is this a Ligand exchange reaction?
View attachment 61747

This topic is removed from the syllabus.

 

[krishnapatelzz]

Please explain Question 5(b), Is this a Ligand exchange reaction?
View attachment 61747

this topic is removed , please check the syllabus before solving any paper before 2016 http://www.cie.org.uk/images/164502-2016-2018-syllabus.pdf

 

[Thought blocker]

this topic is removed , please check the syllabus before solving any paper before 2016 http://www.cie.org.uk/images/164502-2016-2018-syllabus.pdf

You can give it a try if you wanna. xD

 

[krishnapatelzz]

You can give it a try if you wanna. xD

hahahah no

 

[student2]

whats the vol. capacity of syringe?
n does any1 know whn to use a syringe n whn a downward displacement?

 

[Thought blocker]

whats the vol. the capacity of a syringe?
n does any1 know when to use a syringe n when a downward displacement?

In context to paper 5, you can take any sensible volume of the syringe during experiment according to the given situation.
We use gas syringe to measure the amount of gas produced in some experiment.
Check this : https://socratic.org/questions/why-can-hydrogen-be-collected-by-the-downward-displacement-of-water

 

[student2]

Cn any1 pls help me with ths? I dont understand ths
(s11_qp_41)( Q8, c)

 

[Thought blocker]

View attachment 61756

Cn any1 pls help me with ths? I dont understand ths
(s11_qp_41)( Q8, c)

M + 2 peaks are of similar height. 1:1 ration, thus X should be bromine.
If you wanna know more about this, click here.

 

[yamna121]

[QUOT

Two equilibria are shown below.

reaction I 2X2(g) + Y2(g) gives 2X2Y(g)
reaction II X2Y(g) gives X2(g) + 1/2Y2(g)

The numerical value of Kc for reaction I is 2.

Under the same conditions, what is the numerical value of Kc for reaction II?

Why is the answer 1/root2???

 

[Thought blocker]

[QUOT

Why is the answer 1/root2???

?

 

[yamna121]

?

the answer to this question is 1/squareroot of 2 . how did we get that??

 

[Thought blocker]

the answer to this question is 1/squareroot of 2 . how did we get that??

 

[yamna121]

View attachment 61766

okhh!!!!, thanks alott and means alot!!!!

 

[Keshani Privinsha]

Phosphorus forms a compound with hydrogen called phosphine, PH
3
. This compound can react
with a hydrogen ion, H
+
.
Which type of interaction occurs between PH
3
and H
+
? (9701/12/m/j/15)

 

[Keshani Privinsha]

Metaldehyde, (CH
3
CHO)
4
, is used as a solid fuel for camping stoves. The equation for the
complete combustion of metaldehyde is shown.
(CH
3
CHO)
4
(s) + 10
O
2
(g)
→
8CO
2
(g) + 8H
2
O(l)
= standard enthalpy change of combustion.
Which expression will give a correct value for the enthalpy change of formation of metaldehyde?

 

[Keshani Privinsha]

When 3.00
g of an anhydrous nitrate of a Group II metal is decomposed, 1.53
g of gas is
produced.

 

[Keshani Privinsha]

2.40
g of propan-2-ol were mixed with excess acidified potassium dichromate(
VI
). The reaction
mixture was then boiled under reflux for twenty minutes. The organic product was then collected
by distillation. The yield of product was 75.0%

 

[Djlucifer]

Um............I have my Chemistry exams this May/June 2017 session and have about 50 days in my hand so what do I exactly do to get the most of the marks as in an A and how do I plan my revision and stuff like that How do I do really good in Organic Chemistry in both Paper 1 and Paper 2 and some general tips and tricks for solving PApaer 1 which in my opinion is quite hard to some extent

 

[iSean97]

View attachment upload_2017-3-12_23-44-6.png

Hi there peeps, just wondering why is it not A. 3? I drew all the possible structure out.

 

[Error Syntax]

View attachment 61771

Hi there peeps, just wondering why is it not A. 3? I drew all the possible structure out.

Okay , yeah this one is tricky so basically what the examiner wants you to determine is the isomers but in benzene rings there is a hidden isomer which is considered to be where the chlorine atoms are attached to double carbon bonds, which in your diagram is the 4th one and if you ask how it differs from your first well its the difference in single bonds and double bonds which in benzene is something unique.