AS CHEMISTRY HELP!!!!!!!!!!!!!!!?
1) In order to obtain a mass spectrum of a gaseous sample of chromium, the sample must first be ionised.
(i) give to reasons why it is necessary to ionise the cromium in the sample.
(ii) State what is adjusted so that each of the isotopes of chromium can be detected in turn.
(iii) Explain how the adjustment given in part (ii) enables the isotopes of chromium to be separated.
(i) give to reasons why it is necessary to ionise the cromium in the sample.
(ii) State what is adjusted so that each of the isotopes of chromium can be detected in turn.
(iii) Explain how the adjustment given in part (ii) enables the isotopes of chromium to be separated.
Best Answer - Chosen by Voters
1) The chromium atom must be ionised to form Cr+ so that it can be accelerated towards the negative plates and deflected by the magnetic field onto the detector so that a mass spectrum can be produced.
Positive ion will be attracted towards the negatively charged plates and charged ion can be deflected by the magnetic field.
2) The strength of the magnetic field is adjusted.
3)The angle of deflection of ion is proportional to the charge of ion and is inversely proportional to the mass of ion. That means lighter ion is deflected more compared to heavier ion.
By having a lower strength of magnetic field, the lighter ion is directed onto the detector first. As the strength of the magnetic field is increased, the heavier ion in turn is directed onto the detector until all the ions with different masses are detected and a mass spectrum is produced.
Positive ion will be attracted towards the negatively charged plates and charged ion can be deflected by the magnetic field.
2) The strength of the magnetic field is adjusted.
3)The angle of deflection of ion is proportional to the charge of ion and is inversely proportional to the mass of ion. That means lighter ion is deflected more compared to heavier ion.
By having a lower strength of magnetic field, the lighter ion is directed onto the detector first. As the strength of the magnetic field is increased, the heavier ion in turn is directed onto the detector until all the ions with different masses are detected and a mass spectrum is produced.
No comments:
Post a Comment