Summary of salters advanced chemistry part 1

summary of chapters 1 and 2

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Summary of salters advanced chemistry part 1
02 May 2013
11:49
For working out moles: AVOGADRO CONSTANT
· Divide the grams of the
grams substance by the relative One mole of any substance contains 6.02 x 10²³ (NA) formula units
atomic mass · To find out the number of atoms in a substance times it
· This formula works for atoms by the Avogadro constant
RAM MOLES and molecules
Electronic shells Sub shell Maximum number of electrons
1st ionisation enthalpies : 1st = 2 electrons
2nd = 8 electrons s 2
THE ENERGY REQUIRED TO REMOVE 1
ELELCTRON FROM EVERY ATOM IN 1 MOLE 3rd = 18 electrons p 6
OF ISOLATED GASEOUS ATOMS OF AN 4th = 32 electrons
d 10
ELEMENT
f 14
· If it is high then it is difficult to ionise
and very un reactive
· These patterns provide evidence to
support understanding of the nature of The arrangement of electrons in shells and orbitals is called the ELECTRON
electron shells CONFIGURATION
Concentration:
· N is number of moles
· V is volume,dm³
· Across a period, electrons are being · C is concentration mol dm ³
added to the nucleus.
· As the nuclear charge becomes more
positive, electrons will be held more
tightly and so it gets harder to pull one
from the outer shell. 1dm³ = 1000cm³
· Going down groups, 7, the first
ionisation enthalpy decreases because
the attraction between the nucleus and
the outermost electron decreases.
chemistry Page 1

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