CIE A Level Chemistry復習筆記1.3.1 Electronegativity
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...
CIE A Level Chemistry復習筆記1.2.7 Reacting Masses & Volumes
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...
CIE A Level Chemistry復習筆記1.2.6 Water of Crystallisation
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?...
CIE A Level Chemistry復習筆記1.2.5 Empirical & Molecular Formulae
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?...
CIE A Level Chemistry復習筆記1.2.4 Balancing Equations
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...
CIE A Level Chemistry復習筆記1.2.3 Formulae
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 ...
CIE A Level Chemistry復習筆記1.2.2 The Mole & Avogadro Constant
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...
CIE A Level Chemistry復習筆記1.2.1 Relative Masses
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...
CIE A Level Chemistry復習筆記1.1.12 Ionisation Energies & Electronic Configurations
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...
