Definitions 4.0 / 5 based on 1 rating ? ChemistryAtoms and reactionsASAQA Created by: killjoy98Created on: 28-12-14 20:30 isotopes Atoms of the same element with same numbers of electrons and protons but different numbers of neutrons. 1 of 16 An ion a positevely or negatively charged ion or a group of covalently bonded atoms. 2 of 16 relative isotopic mass mass of an atom of an isotope compared with 1/12 of mass of carbon-12 3 of 16 relative atomic mass weighted mean mass of an atom of an element compared with 1/12 of the mass of an atom of carbon-12 4 of 16 a mole is the amount of any substance containing as many particles as there are carbon atoms in exactly 12g of carbon-12 isotope 5 of 16 the avogadro constant is the number of atoms per mole of the carbon-12 isotope 6 of 16 amount of substance the quantity whose unit is a mole 7 of 16 emperical formula is the simplest whole-number ratio of atoms of each element present in a compound 8 of 16 molecular formula is an actual number of atoms of each element in a molecule 9 of 16 molecule is a small group of atoms held together by covalent bonds 10 of 16 molar volume is the volume per mole of a gas 11 of 16 stoichiometry is the molar relationship between the relative quantities of substances taking part in a reaction 12 of 16 acid a species that is a proton donor 13 of 16 base a species that is a proton acceptor 14 of 16 alkali a type of base that dissolves in water to make hydroxide ions, OH(aq) ions 15 of 16 salt any chemical compound formed from an acid when a H ion from the acid is replaced by a metal ion or another positive ion, such as the ammonium ion, NH 16 of 16
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