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hey i think its like that..can anyone tell me how enthalpy change of hydration decreases with increasing size of ion?
Can anyone help me with 2008 Oct/Nov paper 4 question 2 (b).
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w08_qp_4.pdf
I don't understand how they got the numerical values. Thank you.
can anyone ans this for me....?
1)explain why hydrogen is evolved more slowly from methanoic acid solution than a HCL solution?
2)explain why, eventually,the methanoic acid sol produces as much hydrogen as the HCL solution?
add data given: Methanoic acid and hcl both are being reacted to an excess of Magnesium powder .
For a fixed amount of Mg, the rate equation for the reaction is:
rate= k [H+(aq)]
the paper:http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w03_qp_4.pdf
question is 2
yes its right thanks alot i was also thinking that charge density had rolo in thishey i think its like that..
when the size of the ion increases they have weaker charge density because now the same charge spreads over a larger volume. weaker charge density means they will not strongly attract the dipoles of water molecules so they will be less soluble in water and therefore they will have a more positive or less negative value of enthalpy change of hydration.
makes sense ?
thanks bro..!!!Hi everyone, AsSalamoAlaikum Wr Wb..
To get things organized in a better way, I am making this thread. As othewise, some queries remain unanswered!
So post your CHEMISTRY doubts in this thread. InshaAllah members around will help you.
Any Chemistry related notes and links will be added here in this post. Feel free to provide the links to your notes around the forum, or any other websites!
Chemistry Notes:
http://www.chemguide.co.uk This is the website, which contains almost everything classified according to the syllabus.
Tips for solving chemistry MCQs 9701/01
Chemistry P5 Tips and Notes
Some links & Notes - by 'destined007'
Chemistry worksheets Link shared by hassam
Chemistry Application Booklet: Mistakes and Corrections!
Calculations for A level Chemistry, author E.N. Ramsden third edition ebook download.
Regards,
XPC Staff.
Hi everyone, AsSalamoAlaikum Wr Wb..
To get things organized in a better way, I am making this thread. As othewise, some queries remain unanswered!
So post your CHEMISTRY doubts in this thread. InshaAllah members around will help you.
Any Chemistry related notes and links will be added here in this post. Feel free to provide the links to your notes around the forum, or any other websites!
Chemistry Notes:
http://www.chemguide.co.uk This is the website, which contains almost everything classified according to the syllabus.
Tips for solving chemistry MCQs 9701/01
Chemistry P5 Tips and Notes
Some links & Notes - by 'destined007'
Chemistry worksheets Link shared by hassam
Chemistry Application Booklet: Mistakes and Corrections!
Calculations for A level Chemistry, author E.N. Ramsden third edition ebook download.
Regards,
XPC Staff.
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