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AS1 CCEA CHEMISTRY
Term | Definition |
---|---|
Molecular Ion | Two or more atoms covalently bonded with an overall charge |
Avogardo's Constant | Number of atoms in 12.000g of carbon-12. |
Mole | The amount of substance which contains the Avogadro constant of atoms, molecules or groups of ions. |
Molar Mass | The mass of one mole of substance |
Anhydrous (salt) | A salt which contains no water of crystallisation |
Hydrated (salt) | A salt which contains water of crystallisation |
Water Of Crystallisation | Water chemically bonded within a crystal structure |
Atomic Number | Number of protons in (the nucleus of) an atom |
Mass Number | The total number of protons and neutrons in (the nucleus of) an atom |
Relative Atomic Mass (RAM) | The average (weighted mean) mass of an atom of an element relative to one twelfth of the mass of an atom of carbon-12 |
Relative Isotopic Mass (RIM) | The mass of an atom of an isotope of an element relative to one-twelfth of the mass of an atom of carbon-12. |
Isotopes | Atoms which have the same atomic number but a different mass number (contain the same number of protons but a different number of neutrons) |
Relative Formula Mass (RFM) | The average (weighted mean) mass of a formula unit relative to one-twelfth of the mass of an atom of carbon-12. |
Relative Molecular Mass (RMM) | The average (weighted mean) mass of a molecule relative to one-twelfth of the mass of an atom of carbon-12. |
First Ionisation Energy | The energy required to convert one mole of gaseous atoms into gaseous ions with a single positive charge. |
Second Ionisation Energy | The energy required to convert one mole of gaseous ions with a single positive charge into gaseous ions with a double positive charge. |
Third Ionisation Energy | The energy required to convert one mole of gaseous ions with a double positive charge into gaseous ions with a triple positive charge |
Covalent Bond | |
Co-ordinate (dative) Bond | |
Octet Rule | |
Electronegativity | |
Polar Bond | |
Delocalised Electrons | |
Intermolecular | |
Van Der Waals' Forces | |
Permanent dipole-dipole attraction | |
Hydrogen Bonding | |
Redox | |
Oxidation | |
Reduction | |
Oxidising Agent | |
Reducing Agent | |
Disproportionation | |
Strong Acid / Base | |
Weak Acid / Base | |
Molarity | |
Concentration | |
Standard Solution | A solution for which the concentration is known |