C1 2020 Flashcards
1
Q
Give two reasons why it is necessary to ionise the isotopes of chromium before they can be analysed in a TOF mass spectrometer
A
Can be accelerated
Create a current when hit the detector
2
Q
[Al(H2O)6]3+ + EXCESS NaOH
A
[Al(H2O)6]3+ + 4OH- -> [Al(OH)4]- + 6H2O
3
Q
What charge will metal EDTA be?
A
-1
4
Q
Explain with the use of an equation why a solution containing [Al(H2O)6]3+ has a pH <7
A
[Al(H2O)6]3+ + H2O <–> [Al(H2O)3(OH)]2+ + H3O+
Al3+ small size high charge density so weakens OH bond releasing H+
5
Q
State the effect if any of the addition of the catalyst on the value of kP why?
A
No effect
Catalyst does not affect position of equilibrium
6
Q
State what must be done to maintain EMF of this fuel cell when in use
A
Keep concentration of reactants constant
