CHEM1 KEYWORDS 0.0 / 5 ? ChemistryFoundation ChemistryASAQA Created by: Barbara CostaCreated on: 13-04-14 10:20 Mass Number (A) Total number of protons and neutrons in the nucleus of one atom of the element. 1 of 23 Atomic Number (Z) Number of protons in the nucleus of an atom. 2 of 23 Isotope Element with same atomic number/no. of protons but with a different number of neutrons. 3 of 23 Ionisation Energy The enthalpy change to remove 1 mol of electrons from 1 mol of gaseous atoms. 4 of 23 Relative Atomic Mass Average mass of one atom of an element ÷ one twelfth the mass of one atom of carbon-12. 5 of 23 Relative Molecular Mass average mass of one molecule ÷ one twelfth the mass of one atom of carbon-12. 6 of 23 Empirical Formula The simplest whole number ratio of atoms of each element in a compound. 7 of 23 Molecular Formula The actual number of atoms of each element in a molecule. 8 of 23 Structural Formula The unique arrangement of atoms in a molecule in a simplified form without showing all the bonds. 9 of 23 Displayed Formula Shows all the bonds present in a molecule. 10 of 23 Homologous Series Family of organic molecules that all contain the same functional group, but have an increasing number of C atoms. 11 of 23 Functional Group An atom or group of atoms which, when present in different molecules, casues them to have similar chemical properties. 12 of 23 Atom Economy (Mass of desired product ÷ Total mass of reactants) x 100 13 of 23 Percentage yield (Act. mass of product ÷ max. theoretical mass of products) x 100 14 of 23 Ionic Bonding The electrostatic force of attraction between oppositely charged ions. 15 of 23 Covalent Bonding A shared pair of electrons. 16 of 23 Dative covalent bonding A covalent bond where the shared pair of electrons originate from one atom. 17 of 23 Hydrogen Bond Intermolecular force between lone pair of electrons on a N, O or F atom and a hydrogen atom. 18 of 23 Electronegativity The power of an atom to attract electron density from a covalent bond. 19 of 23 Structural Isomerism When component atoms are arranged differently in molecules that have the same molecular formula. 20 of 23 Positional Isomerism Molecules with the same carbon skeleton and functional group, but with the func. group joined at a different place along the molecule. 21 of 23 Chain Isomerism Where there are two or more ways of arranging the carbon skeleton of a molecule. 22 of 23 Cracking Large alkanes being broken down into smaller molecules. 23 of 23
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