O-Level Chemistry

[uptas]

leeh40\" post_id=\"1977017\" time=\"1590034490\" user_id=\"185343:

Hi,

What is the effect of impurities in melting point and boiling point of a substance? Need your help. Thanks.

Hi lee!

Impurities cause lowering of melting point through the process called melting point depression. For the boiling point, on the other hand, impurities results to higher boiling point of the substance because the number of molecules available for boiling is decreased.

I hope it helps!

If you have more assignments to be assisted with, you can post at this forum. https://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=29&t=95661&p=1973791#p1973791
you can also find Q&A and tips and tricks there!

[leeh40]

uptas\" post_id=\"1977132\" time=\"1590057338\" user_id=\"184429:

leeh40\" post_id=\"1977017\" time=\"1590034490\" user_id=\"185343:

Hi,

What is the effect of impurities in melting point and boiling point of a substance? Need your help. Thanks.

Hi lee!

Impurities cause lowering of melting point through the process called melting point depression. For the boiling point, on the other hand, impurities results to higher boiling point of the substance because the number of molecules available for boiling is decreased.

I hope it helps!

If you have more assignments to be assisted with, you can post at this forum. https://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=29&t=95661&p=1973791#p1973791
you can also find Q&A and tips and tricks there!

Why is the impurities causing the melting point to decrease? For the boiling point, thank you so much Uptas for the rationale.

Will visit the forum you have shared for my next queries. Thanks a lot!

[uptas]

leeh40\" post_id=\"1977140\" time=\"1590061422\" user_id=\"185343:

uptas\" post_id=\"1977132\" time=\"1590057338\" user_id=\"184429:

[quote=leeh40 post_id=1977017 time=1590034490 user_id=185343]Hi,

What is the effect of impurities in melting point and boiling point of a substance? Need your help. Thanks.

Hi lee!

Impurities cause lowering of melting point through the process called melting point depression. For the boiling point, on the other hand, impurities results to higher boiling point of the substance because the number of molecules available for boiling is decreased.

I hope it helps!

If you have more assignments to be assisted with, you can post at this forum. https://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=29&t=95661&p=1973791#p1973791
you can also find Q&A and tips and tricks there!

Why is the impurities causing the melting point to decrease? For the boiling point, thank you so much Uptas for the rationale.

Will visit the forum you have shared for my next queries. Thanks a lot![/quote]hi Lee,

Impurities can cause a melting point depression because impurity disrupts the crystal lattice energies.

Hope it helps!

[leeh40]

Hello Uptas,


Thank you for your patience in answering my question. So, the presence of impurities weakens the lattice, making it less stable. As a result, the compound melts at a lower temperature..now I get it! Thank you so much!👍

[chaocheng12]

Hello,


How does paper chromatography works in separating mixture of solutes in a solution?

[change146]

chaocheng12\" post_id=\"1978999\" time=\"1591014513\" user_id=\"185205:

Hello,

How does paper chromatography works in separating mixture of solutes in a solution?

I think it is measured through the different speeds of different solutes travelling on the paper. It has different speeds so eventually they are separated..

[change146]

Thank you for answer.

[rycho12]

Hi,


Need your advice. I’m weak in chemical calculations. Any tips on how to improve?

[cysean009]

rycho12\" post_id=\"1979847\" time=\"1591506037\" user_id=\"186020:

Hi,

Need your advice. I'm weak in chemical calculations. Any tips on how to improve?

Perhaps part of the tips would be to master chemical formulas and balancing of chemical reactions since those are essential factors in chemical calculations.

[Anqi]

i have o level pure chemistry notes for sale, got me really good grades during my prelims, i just took my o level this year