Elements for Life Definitions

Most of the key definitions you need to know for the Elements for life sections of the OCR Chemistry F331 exam

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Relative atomic mass
tells you the number of times an atom of an element is heavier than one-twelfth of an atom of carbon-12
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Relative Formula mass
is the sum of the relative atomic masses for each, for each atom in the formula
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Empirical formula
tells you the actual number of atoms of each elements in a compound
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molecular formula
tells you the actual number of atoms of each element in a molecule
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Isotopes
are atoms of the sam eelement. They have the same atomic number but they have different mass numbers (same protons and electrons, but different neutrons)
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Half-Life
is the time taken for half the radioactive nuclie in a smaple to decay.
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Tracers
are radioactive isotopes whose decay is monitored, they can be used in medicine to aid diagnosis or to find faults in underground pipes
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Energy Levels
In a atom it can occupy any one of the fixed energy levels. These different energy levels are the same for the atoms.
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Absorption Spectra
Seen on the earth is the spectrum of visible light with blacklines corresponding to the absorptions of energy level by the electrons
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Emission Spectra
Has a black background with coloured lines on it. This is different to absorption spectra. These coloured lines correspommd to the emission of the energy by electrons
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Electrons shells
energy levels are normally refered to as electron shells for atoms more complex than hydrogen. Each shell can hold a certain number of electrons.
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Ionic bonding
between an metals and non-metals so that theres full outer shells at the end of the reactions
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Covalent bonding
between two non-metals by sharing a pair of electrons
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Metalic bonding
Between two metals, The atoms become ionised and turn positive, and because of this a 'sea' of delocolised electrons surround the metal ions.
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Periodicity
is when there is a regular pattern in a property across a period or when a pattern is repeated in other periods.
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Mass Spectrometer
An apparatus for separating isotopes, molecules, and molecular fragments according to mass.
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Other cards in this set

Card 2

Front

Relative Formula mass

Back

is the sum of the relative atomic masses for each, for each atom in the formula

Card 3

Front

Empirical formula

Back

Preview of the front of card 3

Card 4

Front

molecular formula

Back

Preview of the front of card 4

Card 5

Front

Isotopes

Back

Preview of the front of card 5
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