Relative Mass Flashcards
1
Q
What is the mass of carbon 12 defined as?
A
Exactly 12 atomic mass units
2
Q
What is the standard mass?
A
1u which is the mass of 1/12th of carbon 12
3
Q
What is lu the mass of?
A
a proton or neutron
4
Q
What is relative atomic mass?
A
Weighted mean mass of an atom of an element relative to 1/12th of the mass of an atom of carbon 12
5
Q
What affects the weighted mean mass?
A
Percentage abundance of each isotope and relative isotopic mass of each isotope
6
Q
How is percentage abundance found?
A
Using a mass spectrometer
7
Q
Why does a mass spectrometer vaporise the sample?
A
To make it positive ions
8
Q
Why are the ions accelerated?
A
So heavier and lighter ions separate and they become separated by mass
9
Q
What is mass to charge ratio?
A
Relative mass of an ion divided by the relative charge on an ion
