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chem unit 1 module 1

definitions

QuestionAnswer
isotopes are atoms of the same element with the same number of protons and electrons but a different number of neutrons
atomic number is the number of protons in the nucleus of an atom.
mass number is the number of protons and neutrons in the nucleus.
relative isotopic mass is the mass of an atom of an isoptope compared to one twelfth of the mass of an atom of carbon- 12
relative atomic mass is the weighted mean mass of an atom of an element compared to one twelfth of the mass of an atom of carbon- 12
relative molecular mass is the weighted mean mass of a molecule compared with one twelfth of the mass of an atom of carbon 12
amount of substance is the quantity whose unit is the mole. chemists use amount of substance as a means of counting atoms
the avogadro constant is the number of atomsper mole of the carbon 12 isotope (6.02x10 23 mol -1
molar mass is the mass per mole of a substance. the units of molar mass are g mol-1
a species is any type of particle that takes part in a chemical reaction
an acid is a species that is a proton donor
a base is a species that is a proton acceptor
hydrated refers to a crystalline compound containing water molecules
anhydrous refers to a substance that contains no water molecules
water of crystallisation refers to water molecules that form an essential part of the crystalline structure of a compound.
an oxidation number is a measure of the number of electrons that an atom uses to bond with atoms of another element.
oxidation is a loss of electrons and an increase in oxidation number
reduction is a gain of electrons and a decrease in oxidation number
redox reaction is a reaction in which both reduction and oxidation take place.
Created by: Louise123