Amount of Substance 1 Flashcards
Mass Number
the number of protons and neutrons
Atomic Number
the number of protons
Proton Mass
1
Proton Charge
+1
Neuton Mass
1
Neutron Charge
0
Electron Mass
negligable
Electron Charge
-1
Ar =
avergae mass of one atom of an element / 1/12 mass of an atom of carbon 12
Mr =
average mass of one molecule / 1/12 mass of an atom of carbon 12
Avogadros Number
6.0225 X 10^23
mass of one atom
mass of a mole / avogadros number
mass of one carbon
12 / 6.0225X10^23
mass
mole X mr
Empiracle Formula
simplest whole number ratio of atoms of each moleule in the compound
H2O2 —-> HO
Working out the Emiracle Formula
Element Mass Divide by RAM Moles Divide by the Smallest
Emma Makes Really Magnificent Donoughts
EMRMD
Molecular Formula
the actual number of atoms of each elemnt in the compound
Cations
Na K Ag H NH4 Cu Mg Ca Fe Zn Pb Ni Al Cr
Sodium
Na+
+1
Potassiuum
K+
+1
Silver
Al+
+1
Hydrogen
H+
+1
Ammonium
NH4+
+1
Copper
Cu+
+1
or
Cu2+
+2
Magnesium
Mg2+
+2
Calcium
Ca2+
+2
Iron
Fe2+
+2
or
Fe3+
+3
Zinc
Zn2+
+2
Lead
Pb2+
+2
Nickel
Ni2+
+2
Aluminium
Al3+
+3
Chromium
Cr3+
+3
Anions
OH SO4 CO3 NO3 HCO3
Hydroxide
OH-
-1
Sulphate
SO42-
-2
Carbonate
CO32-
-2
Nitrate
NO3-
-1
Hydrogencarbonate
HCO3-
-1
