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Summary OCR A level Notes - Foundations in Chemistry
Summary of 9 pages for the course Unit 2 at OCR (Specification Notes)
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Foundations in ChemistryATOMIC STRUCTURE AND ISOTOPES : 2.1.1
what is an isotope
isotopes are different forms of elements where the number of neutrons is
different but the proton number is the same
number of electrons are also the same so chemical properties are the same
what are the different models for atomic structure
plum pudding model - ball of positive charge with electrons embedded
rutherford model - gold alpha particles fired
deflection showed the concentrated positive mass in the nucleus
most particles moved straight through showing that atom is mostly
empty space
james chadwick discovers the neutron
neils bohr model = modern version
what is relative isotopic mass
relative isotopic mass is the relative mass of isotopes of an element relative
to 1/12th of the weighted mass of a carbon 12 atom
what is relative atomic mass
mean weighted mass of an atom relative to 1/12th the mass of a carbon 12
what is mass spectrometry
determine the m/z ratio to find the relative atomic mass of the atom
highest m/z = Mr
ionisation
acceleration
deflection
Foundations in Chemistry 1
, detection
COMPOUNDS , FORMULAE AND EQUATIONS : 2.1.2
what are the formulae for nitrate carbonate sulphate hydroxide ammonia zinc
and silver ions
NO3-
CO3 2-
SO4 2-
OH-
NH3+
Zn 2+
Ag+
AMOUNT OF SUBSTANCE : 2.1.3
what is a mole
the unit of measurement for an amount of a substance
what is avogadro's constant
6.022 x 10^23
what is empirical formula
simplest ratio of elemnts in a compound
what is molecular formula
a chemical formula which shows all the the elements found in the
compound
what does anhydrous mean
containing no water molecules
the ideal gas equation
pv=nRt
Foundations in Chemistry 2
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