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22 Cards in this Set
- Front
- Back
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Atom |
The smallest particle that can exist |
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Relative atomic mass |
The weighted mean mass of an atom of an element compared with one twelfth of the mass of an atom of carbon-12 |
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Isotope |
Atoms of the same element with different numbers of neutrons and different masses |
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Relative isotopic mass |
The mass of an isotope compared with one twelfth of the mass of an atom of carbon 12 |
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Relative molecular/formula mass |
The weighted mean mass of a molecule of a compound compared with one twelfth of the mass of an atom of carbon 12 |
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Amount of a substance(mol) |
The quantity whose unit of the mole. Chemists use amount of substance as a means of counting atoms |
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Avagadro constant |
6.02×10^23mol-1 the number of atoms per moleof carbon 12 |
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Molar mass (g mol-1) |
The mass per mole of a substance in units of g mol-1 |
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Molar gas volume (dm3 mol-1) |
The volume per mole of gas molecules at a stated temperature and pressure |
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Empirical formula |
A formula that shows the simplest whole number ratio of atoms of each element present in a compound |
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Molecular formula |
A formula the shows the number and type of atoms of each element present in a molecule |
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Stoichiometric formula |
The ratio of the amount in moles of each substance in a chemical reaction |
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Spectator ion |
The ions that do not change in the reaction |
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Ionic equation |
An equation where the electrolytes in aqueous solution are written as dissociated ions |
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Titration |
A technique used to accurately measure the volume of one solution that reacts exactly with another solution |
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Equation of gas moles |
pV=nrt |
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Anhydrous |
Containing no water molecules |
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Hydrated |
Containing water molecules |
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Water of crystallisation |
Water molecules that are bonded into a crystalline structure of a compound |
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Ideal gas law |
The volume occupied by moles of any gas has a pressure at temperature in kelvin. pV=nRT, where R- gas constant, called the ideal gas law /equation of state |
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Percentage yield |
Actual yield÷theoretical yield ×100% |
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Atom economy |
A measure of how well atoms have been utilised |
