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(lián)邦國家，用A-Level成績申請澳洲大學(xué)很有優(yōu)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(lián)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...
Relative Masses Atomic Mass Unit The mass of a single atom is so small that it is impossible to weigh it directly Atomic masses are therefore defined in terms of a?standard?atom which is called the...
Ionisation Energies: Explained Energy?is required to remove an outer shell electron as this involves breaking the?attractive?forces?between the electron and the?positively?charged?nucleus There are...
