Bonding and Structure. Exam 2.4
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| Avogadro's Number | 6.02 x 10^23
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| Endothermic | A reaction where heat energy is absorbed from the surrounding area. ArH is positive
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| Exothermic | A reaction where heat energy is released to it's surrounding area. ArH is negative
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| Enthalpy | Heat energy content
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| Formula unit | The smallest repeating unit of a substance or the empirical formula of an ion or covalent network solid compount
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| Heat of reaction | The amount to hear energy absorbed or released during a particular reaction.
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| Molar Mass | the mass of one mole of substance in grams. mg
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| Molecule | A discreet group of atoms bonded together, which retain the chemical physical properties of that substance
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| Relative atomic mass*(RAM) | The ratio of the average mass of an atom when compared to Carbon-12
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| Anion | A negatively charged ion formed from an atom that has gained one or more elections
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| Cation | A positively charged ion formed from a atom that has lost one or more elections.
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| Covalent bonds | The attraction between the nuclei of the bonding atom and the shared pair of electrons. Covalent bonds form between non-metals elements.
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| Delocalised electrons | Valance elections that are not held to a particular atom but are free to move around within a substance.
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| Electrolysis | The passage of an electric current through a solution
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| Electroyte | A substance that will conduct an electric current.
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| Electron configuration | The arrangement of electrons in the energy levels around the nucleus
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| Element | A substance made up of the same kind of atoms
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| Ion | A charged partial formed form an atom that has lost or gained an electron.
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| Ionic bonding | The electrostatic attraction between a positive cation and a negative anion.
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| Istope | An atom of the same element that has different number of neutrons.
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| Matallic bonding | The electrostatic attraction between the positive metal atom core and the delcoalised electrons. As the electron are not fixed to a particular atom. Matallic bonds are non-directional
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| Dipole | An electric field or uneven distribution of electric density within a bond or over the whole molecule.
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| Giant covalent solid | A substance made up of atoms held together by strong covalent bonds. Usually C, Si, Ge
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| Hydrogen bonding | The stongest type of intermolecular attraction between molecules.
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| Intermolecular bonding | The attraction forces between the molecules. Very strong.
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| Intramolecular forces | Within the molecule, covalent bonding.
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Created by:
BethS
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