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Chemistry definition

QuestionAnswer
Atomic number the X of an element is the number of protons in the nucleus of one atom of that element
Relative atomic mass The X of an element is the weighted average mass of an atom of that element divided by 1/12 the mass of a carbon-12 atom
Relative molecular mass The X of an element or compound is the average weighted mass of a molecule of that element or compound divided by 1/12 the mass of a carbon-12 atom
Mass number of an isotope The X of an element is the sum of the number of protons and neutrons in the nucleus of an atom of that isotope.
Relative isotopic mass The X is the mass of an atom of that element divided by 1/12 the mass of a carbon-12 atom
Isotope X are atoms of the same element that have the same number of protons but different number of neutrons.
Electronegativity The X of an element is the extent to which is attracts a pair of electrons in a covalent bond towards itself.
First electron affinity The X is the energy change when one electron is added to each atom in one mole of neutral gaseous atoms.
Standard enthalpy change of reaction The enthalpy change when the number of moles of the substance in the equation as written react under certain conditions of 1 atm pressure and a stated temperature, usually 298K. The units are kJ per mol.
Standard enthalpy change of combustion The enthalpy change when 1 mol of the substance is burnt in excess oxygen under standard conditions of 1 atm pressure and a stated temp of usually 298K. The units are kJ per mol.
Created by: 100000955746818