Atoms and Reactions 0.0 / 5 ? ChemistryReactionsASOCR Created by: Sasha CosgroveCreated on: 21-03-15 10:18 Atomic Number (proton number) Number of protons in an atom 1 of 24 Mass number (nucleon number) Number of particles (protons+neutrons) in an atom 2 of 24 Ion Positively or negatively charged covalently bonded atom or group of atoms that form a molecular ion 3 of 24 Isotopes Atoms of elements with different number of neutrons and different masses 4 of 24 ¹²C The standard measurement of relative masses 5 of 24 Relative isotopic mass The mass of an atom of an isotope when compared with ½ of the mass of a carbon-12 atom 6 of 24 Relative atomic mass Weighted mean mass of an atom of an element when compared with ½ of the mass of a carbon-12 atom 7 of 24 The Mole Amount of substance that contains as many single particles as there are atoms in 12g of the carbon-12 isoptope 8 of 24 Molar Mass, M or Mr Mass per mole of substance, units are gmolˉ¹ 9 of 24 Avogadro's Constant, Nₐ The number of atoms per mole of the carbon-12 isotope. 6.02x10²³ molˉ¹ 10 of 24 Emperical formula Simplest whole number ratio of atoms of each element in a compound 11 of 24 Molecular formula The actual number of each element in a molecule of a compound 12 of 24 Concentrated Large amount of solute per dm³ 13 of 24 Dilute Small amount of solute per dm³ 14 of 24 Acids Release H˖ ions in aqueous solution - Proton DONATOR 15 of 24 Bases Readily accepts H˖ ions from an acid - Proton ACCEPTOR 16 of 24 Alkalis Soluble base that can release hydroxide ions, OHˉ in aqueous solution 17 of 24 Salt Substance formed when one or more H˖ ion of an acid is replaced by a metal ion or an ammonium ion, NH₄˖ 18 of 24 Water of Crystalisation Refers to the number of water molecules that form an essential part of the crystalline structure of a compound 19 of 24 Hydrated Refers to a crystalline compound containing water molecules 20 of 24 Anhydrous Refers to a substance that no water molecules 21 of 24 Redox Reactions in which electrons are transferred from one substance to another 22 of 24 OIL RIG Oxidation is loss of electrons, increase in oxidation number, Reduction is gain decrease in oxidation number 23 of 24 Oxidation number Number of electrons that an atom uses to bond with atoms of other elements 24 of 24
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