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22 Cards in this Set
- Front
- Back
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Relative Atomic Mass |
The weighted mean mass of an atom compared to 1/12th the mass of an atom of C-12. |
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Relative Isotopic Mass |
The mass of an isotope relative to 1/12th the mass of an atom of C-12. |
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Isotope |
An atom of an element with the same number of protons but a different number of neutrons. |
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First Ionistion Energy |
The energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions. |
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Atomic Orbital |
A region around the nucleus that can hold up to two electrons with opposite spins. |
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Electronegativity |
A measure of the attraction of a bonded atom for the pair of electrons in a covalent bond. |
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Hydrogen Bond |
A strong dipole-dipole attraction between an electron-deficient H atom of -NH, -OH, or -HF on one molecule and a lone pair of electrons on a highly electronegative atom containing O, N, or F on a different molecule. |
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Acid |
A species that releases H+ ions in aqueous solution. |
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Strong Acid |
An acid which dissociates completely in aqueous solution. |
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Weak Acid |
An acid which dissociates only partially in aqueous solution. |
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Base |
A compound that neutralises an acid to form a salt. |
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Alkali |
A type of base that dissolves in water forming OH- ions. |
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Salt |
The product of a neutralisation reaction in which H+ ions from the acid are replaced by metal or ammonium ions. |
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Redox Reaction |
A reaction involving reduction and oxidation. |
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Covalent Bond |
The strong electrostatic attraction between a shared pair of electrons and the nuclei of the bonded atoms. |
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Water of Crystallisation |
Water molecules that are bonded into a crystalline structure of a compound. |
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Ionic Bond |
The electrostatic attraction between anions and cations. |
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Metallic Bond |
The electrostatic attraction between positive metal ions and delocalised electrons. |
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Enthalpy Change of Formation |
The energy change to form 1 mole of a compound from its elements. |
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Enthalpy Change of Neutralisation |
The energy change when an acid is neutralised by a base to form 1 mole of water. |
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Enthalpy Change of Combustion |
The energy change when 1 mole of a compound reacts completely with oxygen. |
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Standard Conditions |
1 atm, 298 K, 1 mol dm-3 |
