Flashcards
OCR Chemistry Definitions 1.1
Flashcards do conjunto (16)
- 1Isotopesare atoms of an element with different numbers of neutrons and different masses
- 2Relative Isotopic Massthe mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12
- 3Relative atomic massis the weighted mean mass of an atom of an element compared with one-tewlfth of the mass of an atom of carbon-12
- 4Amount of substancethe quantity whose unit is the mole
Chemists use 'amount of substance' as a means of counting atoms - 5Avogadro Constantthe number of atoms per mole
- 6MoleUnit for amount of substance
- 7Molar Massthe mass per mole of a substance
- 8Empirical FormulaThe simplest whole number ratio of atoms of each element present in a compound
- 9Molecular FormulaTh actual number of atoms of each element in a molecule
- 10SaltA salt is produced when the H+ ion of an acid is replaced by a metal ion or NH(4)+
- 11Acid + CarbonateSalt + Water + CO2
- 12Acid + BaseSalt + Water
- 13Acid + AlkaliSalt + Water
- 14AnhydrousSubstance that contains no water molecules
- 15HydratedA crystalline compound containing water molecules
- 16Water of CrystallisationWater molecules that form an essential part of the crystalline structure of a compound