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16 Cards in this Set
- Front
- Back
Amount of Substance |
The quantity whose unit is the mole. Chemists use 'Amount of Substance' as a means of counting atoms.
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Number of moles?
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Sample/Molar mass (Atomic number)
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Avogadro constant
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Na(small a) is the number of atoms per mole of the carbon-12 isotope. 6.02x10(23) mol(-1)
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Mole
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The amount of any substance containing as many particles there are carbon atoms in exactly 12g of the carbon-12 isotope.
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A Molecule
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Two or more atoms joined together
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Ion
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A charged particle
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Which atomic structure, when varied, changes the element?
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Proton
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Which atomic structure, when varied, changes the ionisation of the particle?
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Electron
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Which atomic structure, when varied, causes an isotope?
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Neutron
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RELATIVE ATOMIC MASS
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THE AVERAGE MASS OF AN ELEMENT, COMPARED WITH 1/12 THE MASS OF CARBON-12.
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Isotope
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The same atomic number but different mass numbers OR The same no. of protons but different number of neutrons.
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What are the two properties of an isotope?
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Chemical; How the electrons are arranged on the outer shell
Physical(such as density); different masses (melting/boiling points) (FATTIES STICK TOGETHER) |
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Calc RAM:
Cl; Cl-35 75% and Cl-37 25% |
Average mass:
(75x35)+(25x37) / 100 =35.5 |
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What are the two main evidences for the existence of atomic shells?
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LINE SPECTRUM
SUCESSIVE IONISATION |
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Tell me about S,P,D,F orbitals.
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S has max of 2. (1 orbital)
P has a max of 6. (3 orbitals) D has a max of 10. (5 orbitals) F has a max of 14. (7 orbitals) E.G O (8 e-). 1s(2),2s(2), 2p(4) |
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1st Ionisation Energy
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Removal of one mole of electrons from the outer shell of one mole of atoms in the gaseous state.
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