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Chem Level 2
Bonding and Structure. Exam 2.4
| Question | Answer |
|---|---|
| Avogadro's Number | 6.02 x 10^23 |
| Endothermic | A reaction where heat energy is absorbed from the surrounding area. ArH is positive |
| Exothermic | A reaction where heat energy is released to it's surrounding area. ArH is negative |
| Enthalpy | Heat energy content |
| Formula unit | The smallest repeating unit of a substance or the empirical formula of an ion or covalent network solid compount |
| Heat of reaction | The amount to hear energy absorbed or released during a particular reaction. |
| Molar Mass | the mass of one mole of substance in grams. mg |
| Molecule | A discreet group of atoms bonded together, which retain the chemical physical properties of that substance |
| Relative atomic mass*(RAM) | The ratio of the average mass of an atom when compared to Carbon-12 |
| Anion | A negatively charged ion formed from an atom that has gained one or more elections |
| Cation | A positively charged ion formed from a atom that has lost one or more elections. |
| Covalent bonds | The attraction between the nuclei of the bonding atom and the shared pair of electrons. Covalent bonds form between non-metals elements. |
| Delocalised electrons | Valance elections that are not held to a particular atom but are free to move around within a substance. |
| Electrolysis | The passage of an electric current through a solution |
| Electroyte | A substance that will conduct an electric current. |
| Electron configuration | The arrangement of electrons in the energy levels around the nucleus |
| Element | A substance made up of the same kind of atoms |
| Ion | A charged partial formed form an atom that has lost or gained an electron. |
| Ionic bonding | The electrostatic attraction between a positive cation and a negative anion. |
| Istope | An atom of the same element that has different number of neutrons. |
| 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 |
| Dipole | An electric field or uneven distribution of electric density within a bond or over the whole molecule. |
| Giant covalent solid | A substance made up of atoms held together by strong covalent bonds. Usually C, Si, Ge |
| Hydrogen bonding | The stongest type of intermolecular attraction between molecules. |
| Intermolecular bonding | The attraction forces between the molecules. Very strong. |
| Intramolecular forces | Within the molecule, covalent bonding. |
Created by:
BethS
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