• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Chemistry: Post your doubts here!

Messages
1,171
Reaction score
4,151
Points
273
Can anyone tell me how to solve 9702/01/O/N/07 question 10
The mass of the object is 0.6 kg and its acceleration of 4 m/s^2. So first use F=ma to calculate the force required to accelerate a 0.60 kg mass to 4 m/s^2.

F=ma
F=0.60 x 4= 2.4N

But the force applied is 12N and the force needed to cause this much acceleration is only 2.4 N.
Therefore, the friction force is 12 - 2.4= 9.6N

The answer is D.
 
Messages
1,318
Reaction score
1,374
Points
173
upload_2015-11-30_20-24-31.png
How is part (ii) Nucleophilic substitution?
Shouldn't it be electrophilic? please explain...
 
Messages
1,318
Reaction score
1,374
Points
173
To react with alkali aqueous iodine, it must have CH3C=O group i.e. it must have a methyl ketone group
Only then will iodoform reaction occur replacing the CH3 with CHI3
D has CH3CH2 attached to it instead of just CH3 so it's wrong

b)
I think it's because D has CH3CH2 attached on both sides so it's symmetrical whereas E is not symmetrical
 
Messages
1,318
Reaction score
1,374
Points
173
Hey did you get it mate? I don't think I'm really good at elaborating something ?
Yeah kind of
I got it that NH2 is positive so the attacking group must be an nucleophile but then I don't understand how the CH3-CH2 will behave as a nucleophile :p
 
Messages
1,171
Reaction score
4,151
Points
273
Yeah kind of
I got it that NH2 is positive so the attacking group must be an nucleophile but then I don't understand how the CH3-CH2 will behave as a nucleophile :p
Actually Carbon has 4 bonds but in CH3 it has 3. So it wants to get another bond
 
Messages
1,318
Reaction score
1,374
Points
173
9093 English AS
Any tips on how to write a commentary?
Like the layout and perhaps a list of features and effects to look for?
Can anyone provide me with sample commentaries if you have done in school? (preferably with marks)

Also tips on paper 1 and paper 2 as well to get an A
Thanks in advance :)
 
Messages
1,318
Reaction score
1,374
Points
173
Hi,
Anyone have an online copy for the new 2016 second edition chemistry coursebook?
Or could anyone help me out with a scan copy of just a couple of the chapters from the A2 portion that I require please? :)
Regards
 
Messages
3,412
Reaction score
9,812
Points
523
How to prepare for Chemistry Paper 5 from scratch?
I'm done with AS and A2 syllabus, because I've already given Paper 2 and Paper 4.
What more do I need to do in order to get good marks in Paper 5?
 
Top