Electronegativity: Trends Electronegativity?varies across?Periods?and down the Groups of the Periodic Table Down a group There is a?decrease?in?electronegativity?going down the Group The?nuclear ch...
Electronegativity: Definition Electronegativity?is the ability of an atom to attract a pair of electrons towards itself in a covalent bond This phenomenon arises from the?positive?nucleus’s ability...
Mole Calculations The number of moles of a substance can be found by using the following equation: It is important to be clear about the type of particle you are referring to when dealing with mole...
作為英聯邦國家，用A-Level成績申請澳洲大學很有優勢。澳洲八大名校對于A-Level的成績要求比高考成績要寬松很多，升讀名校更容易。 澳大利亞八校聯盟（Group of Eight，簡稱Go8或G8），又稱澳大利亞八大名校、澳...
Water of Crystallisation Water of crystallisation?is when some compounds can form?crystals?which have?water?as part of their structure A compound that contains water of crystallisation is called a?...
Empirical & Molecular Formulae The?molecular?formula?is the formula that shows the?number?and?type?of each atom in a molecule Eg. the molecular formula of ethanoic acid is C2H4O2 The?empirical?...
Balancing Equations A?symbol?equation is a shorthand way of describing a chemical reaction using?chemical symbols?to show the number and type of each atom in the reactants and products A?word?equat...
Formulae of Ionic Compounds Ionic?compounds?are formed from a?metal?and a?nonmetal?bonded together Ionic compounds are electrically neutral; the positive charges equal the negative charges Charges ...
Mole & Avogadro Constant The?Avogadro constant?(NA?or?L) is the number of particles equivalent to the relative?atomic?mass?or?molecular mass?of a substance The Avogadro constant applies to atom...
