Chemistry: Post your doubts here!

[princess Anu]

Solution please?!

 

[Awesome12]

How is it C??

 

[princess Anu]

How is it C??

View attachment 49720

The ratio of volume of gases is the ratio of their moles
So 1:3:1:1:1 is the ratio shown by the equation but the ratio given is 1:6
therefore 30cm of O2 will be used leaving the excess (30cm)
and we get 10 cm of CO2, h20 nd SO2 makes a total of 6o. But since the mixture is cooled, h20 will convert into water and so the remaining volume will be 50.

 

[Awesome12]

The ratio of volume of gases is the ratio of their moles
So 1:3:1:1:1 is the ratio shown by the equation but the ratio given is 1:6
therefore 30cm of O2 will be used leaving the excess (30cm)
and we get 10 cm of CO2, h20 nd SO2 makes a total of 6o. But since the mixture is cooled, h20 will convert into water and so the remaining volume will be 50.

Thanks.

 

[Awesome12]

Why is it B?

 

[princess Anu]

Why is it B?

View attachment 49733

The dipoles in A C D cancel out but not in B.
Remember, Trigonal planar shaped molecules can cancel dipoles if all the bonds made are polar, like in C.

 

[Awesome12]

The dipoles in A B D cancel out but not in C.
Remember, Trigonal planar shaped molecules can cancel dipoles if all the bonds made are polar, like in C.

But the answer is B. And both B and C are trigonal planar shaped molecules.

 

[princess Anu]

But the answer is B. And both B and C are trigonal planar shaped molecules.

Like I said, IF ALL THE BONDS ARE POLAR. Therefore C has no dipoles while B has.
Sorry, I mistyped. It's 'The dipoles in A C D cancel out but not in B'.

 

[slisjunknown]

I do not understand the periodic trends in period 3 for electrical conductivity, boiling points, ionic radii and atomic radii. many sources show different graph representation. It would be highly appreciated if anyone can explain the graphs for the properties. Is there any specific way to place values in the graphs? Cuz my teacher says you have to guess the values...

 

[savera]

I do not understand the periodic trends in period 3 for electrical conductivity, boiling points, ionic radii and atomic radii. many sources show different graph representation. It would be highly appreciated if anyone can explain the graphs for the properties. Is there any specific way to place values in the graphs? Cuz my teacher says you have to guess the values...

I hope this helps. If not don't hesitate to ask questions

 

[slisjunknown]

I hope this helps. If not don't hesitate to ask questions View attachment 49764 View attachment 49765 View attachment 49766 View attachment 49767

Thnks a lot..these notes are much simpler. Where r u from?

 

[savera]

Karachi,Pakistan.

Thnks a lot..these notes are much simpler. Where r u from?

 

[savera]

Thnks a lot..these notes are much simpler. Where r u from?

I'am glad that it helped you

 

[ashcull14]

help plz today.....dnt hav tym
:/

 

[Wolfgangs]

Help please

 

[savera]

Help please

Ans is D. Subtract the second ionization energy with the first, third with the second, fourth with third and so on. Where ever you find the greatest ionization change, will be the Group Number.

 

[Asad rehman]

View attachment 49773

help plz today.....dnt hav tym
:/

Ans is B.
Enthalpy change=(Energy given out when bonds are made) - (Energy taken in when bonds are broken)
1800=2X-(994=496)
X=835KJ

 

[Asad rehman]

Yar

Re: All Chemistry help here!! Stuck somewhere? Ask here!


jaldi btao....i calculated bt not confident wid ma anser

PH 4.14 hai kia?

 

[My Name]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_21.pdf
question 2 part c-ii
Where and why would C be ?

can some one answer this
Plz and thanku

 

[Bacchus]

Re: All Chemistry help here!! Stuck somewhere? Ask here!


jaldi btao....i calculated bt not confident wid ma anser

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.
Gyz any one with chemistry alevles PDF plzzz upload it
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.