OCR Chemistry Definitions 1.1

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Key definitions
09valentinerhi
Flashcards by 09valentinerhi, updated more than 1 year ago
09valentinerhi
Created by 09valentinerhi over 9 years ago
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Question Answer
Isotopes are atoms of an element with different numbers of neutrons and different masses
Relative Isotopic Mass the mass of an atom of an isotope compared with 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 with one-tewlfth of the mass of an atom of carbon-12
Amount of substance the quantity whose unit is the mole Chemists use 'amount of substance' as a means of counting atoms
Avogadro Constant the number of atoms per mole
Mole Unit for amount of substance
Molar Mass the mass per mole of a substance
Empirical Formula The simplest whole number ratio of atoms of each element present in a compound
Molecular Formula Th actual number of atoms of each element in a molecule
Salt A salt is produced when the H+ ion of an acid is replaced by a metal ion or NH(4)+
Acid + Carbonate Salt + Water + CO2
Acid + Base Salt + Water
Acid + Alkali Salt + Water
Anhydrous Substance that contains no water molecules
Hydrated A crystalline compound containing water molecules
Water of Crystallisation Water molecules that form an essential part of the crystalline structure of a compound
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