Unit 1 chemistry key words 3.0 / 5 based on 1 rating ? ChemistryASAQA Created by: Kelly DaviesCreated on: 19-12-12 14:57 the number of protons in the nucleus of an atom atomic number 1 of 20 occurs when the energy required for bond breaking in hydrocarbons is provided by heat in the presence of a catalyst. catalytic cracking 2 of 20 6.022 x 10(3) particles mol-1 avogadro constant 3 of 20 when large alkanes are broken into smaller molecules. cracking 4 of 20 the enthalpy change for the removal of one mole of electrons from one mole of atoms of an element in the gas phase. first ionisation energy 5 of 20 the electrostatic force of attraction between oppositely charged ions. ionic bonds 6 of 20 the simplest ratio of atoms of each element in a compound. empirical formula 7 of 20 An atom or group of atoms which, when present in different molecules, causes them to have similar chemical properties. functional group 8 of 20 an inter-molecular force between the lone pair on a electronegative atom (N, O, F) and a hydrogen atom bonded to such an electronegative atom. hydrogen bonding 9 of 20 the power of an atom to attract the shared electrons in a covalent bond electronegativity 10 of 20 shows all the bonds present in a molecule displayed formula 11 of 20 a family of organic molecules which all contain the same functional group but have an increasing number of carbon atoms. homologous series 12 of 20 an atom or group of atoms which has lost or gained one or more electrons, giving it a positive or negative charge. ion 13 of 20 atoms of the same element with the same atomic number but with different mass numbers. isotopes 14 of 20 molecules with the same chemical formula but in which the atoms are arranged differently isomers 15 of 20 a quantity of particles mole 16 of 20 the total number of protons and neutrons in the nucleus of one atom of the element, mass number 17 of 20 the displacement of electron density in a covalent bond due to a difference in electronegativity. polarity 18 of 20 A hydrocarbon containing only single carbon to carbon bonds. saturated hydrocarbons 19 of 20 electrostatic attraction between metal ions and delocalised electrons. metallic bonding. 20 of 20
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