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Flashcards in Definitions Deck (22)
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1

Isotopes

Atoms of the same element with different numbers of neutrons and different masses

2

Relative isotopic mass

mass compared with 1/12th mass of carbon-12

3

Relative atomic mass

weighted mean mass compared with 1/12th mass of carbon-12

4

Ionic bonding

electrostatic attraction between positive and negative ions

5

Covalent bond

strong electrostatic attraction between a shared pair of electrons and the nuclei of the bonded atoms

6

Electronegativity

the ability of an atom to attract the bonding electrons in a covalent bond

7

Hydrogen bonding

intermolecular bonding between molecules containing N, O or F and the H atom of –NH, –OH or HF

8

First ionisation energy

removal of 1 mol of electrons from 1 mol of gaseous atoms

9

Disproportionation

oxidation and reduction of the same element

10

enthalpy change of formation

formation of 1 mol of a compound from its elements

11

enthalpy change of combustion

complete combustion of 1 mol of a substance

12

enthalpy change of neutralisation

formation of 1 mol of water from neutralisation

13

average bond enthalpy

as the breaking of 1 mol of bonds in gaseous molecules

14

homologous series

a series of organic compounds having the same functional group but with each successive member differing by CH2

15

structural isomers

compounds with the same molecular
formula but different structural formulae

16

electrophile

an electron pair acceptor

17

nucleophile

an electron pair donor

18

Relative atomic mass

the weighted mean mass of an atom compared with 1/12th mass of an atom of carbon-12

19

Relative isotopic mass

the mass of an atom of an isotope compared with 1/12th mass of an atom of carbon-12.

20

Giant covalent lattice

network of atoms bonded by strong covalent bonds (e.g. carbon (diamond, graphite and graphene) and silicon)

21

Heterolytic fission

when a covalent bond breaks, one bonding atom receives both electrons from the bonded pair.

22

Homolytic fission

​when a covalent bond breaks, each bonding atom receives one electron from the bonding pair, forming 2 radicals.