atoms,ions and compounds Flashcards
what is a binary compound
comprise of two elements eg sodium oxide.
what is a polyatomic ion
more complex ions consist of atoms of more than one element bonded together.
formulae for ammonium
NH +
4
hydroxide
OH-
nitrate formulae
NO -
3
carbonate formulae
CO 2-
3
phosphate formulae
PO 3-
4
sulphate formulae
SO 2-
4
nitrite formulae
NO -
2
sulphite formulae
SO 2-
3
hydrogencarbonate formulae
HCO -
3
dichromate formuale
Cr O 2-
3 7
manganate (VII) (permangnate)
MnO4 -
zinc formulae
Zn2+
silver
Ag+
what is relative isotopic mass
the mass of an isotope relative to 1/12th of the mass of an atom of carbon-12
what is relative atomic mass
relative atomic mass is the weighted mean mass of an atom of an element relative to 1/12th of the mass of an atom of carbon -12
What can a mass spectrometer be used for?
Determine the accurate relative atomic mass of an element and also find the abundance of or mass of isotopes present in a sample
what are the stages of a mass spectrometer
ionisation , acceleration , ion drift , detection
what is the electron gun ionisation used for?
elements and low Mr compounds
what is electrospray ionisation used for?
used for high MR compounds eg proteins
which ions reach the detector first and why ?
the lighter ions reach the detector first because they travel faster than heavier ones as they are lighter. they have the same kinetic energy.
nitrate
NO3-
