15 Questions
What is the atomic number of an atom?
The number of protons in the nucleus
What technique can be used to ionize a sample in a mass spectrometer?
Electrospray ionisation
What are isotopes?
Atoms with the same number of protons, but different numbers of neutrons
What is the relative mass of an electron?
-1/1840
What does the mass number represent for an atom?
The total number of protons and neutrons in the atom
What is the purpose of the high voltage at the tip of the needle in electro spray ionisation?
To form MH+ ions from the sample molecule and proton
Which technique is preferred for larger organic molecules due to its 'softer' conditions?
Electro spray ionisation
What determines the velocity of each particle in the flight tube?
The mass of the particle
What generates a small current fed to a computer for analysis in the detection area?
The ions reaching the detector
In electro spray ionisation, what role does the volatile, polar solvent play?
Forming MH+ ions from the sample molecule and proton
What is the effect of electron impact on larger organic molecules?
It causes larger organic molecules to fragment
Which area is responsible for distinguishing ions by their flight times?
Ion drift area
What is used to accelerate positive ions in the acceleration area?
$KE = ½ mv^2$
What does the velocity of each particle in the flight tube depend on?
$m = mass of the particle (kg)$
'Softer' conditions in electro spray ionisation mean that:
$m/z$ values do not move faster
Learn about the details of the three sub-atomic particles and how to represent an atom using atomic number and mass number. Understand the concept of isotopes and how to calculate the number of neutrons in an atom.
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