AQA A Level Chemistry复习笔记1.2.6 Hydrated Salts
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 ca...
AQA A Level Chemistry复习笔记1.2.5 Atom Economy
Atom Economy The atom economy of a reaction shows how many of the atoms used in the reaction become the desired product The rest of the atoms or mass is wasted It is found directly fr...
AQA A Level Chemistry复习笔记1.2.4 Reaction Yields
Percentage Yield In a lot of reactions, not all reactants react to form products which can be due to several factors: Other reactions take place simultaneously The reaction does not go to co...
AQA A Level Chemistry复习笔记1.2.3 Balanced Equations
Deducing Formulae of Compounds Ionic compounds are formed from a metal and a non-metal bonded together Ionic compounds are electrically neutral; the positive charges equal the negative charg...
AQA A Level Chemistry复习笔记1.2.2 Empirical & Molecular Formula
Empirical & Molecular Formulae The molecular formula is the formula that shows the number and type of each atom in a molecule E.g. the molecular formula of ethanoic acid is C2H4O2 ...
AQA A Level Chemistry复习笔记1.1.7 Ionisation Energy: Trends & Evidence
Ionisation Energies: Equations The second ionisation energy (IE2) is the energy required to remove the second mole of electrons from each +1 ion in a mole of gaseous +1 ions, to form one mol...
AQA A Level Chemistry复习笔记1.1.6 Ionisation Energy
Ionisation Energies The Ionisation Energy (IE) of an element is the amount of energy required to remove one mole of electrons from one mole of gaseous atoms of an element to form one mole of...
AQA A Level Chemistry复习笔记1.1.5 Electron Configuration
Deducing the Electron Configuration The Periodic Table is split up into four main blocks depending on their electron configuration Elements can be classified as an s-block element, p-block e...
AQA A Level Chemistry复习笔记1.1.4 Shells and Orbitals
Electron Shells Shells The arrangement of electrons in an atom is called the electron configuration Electrons are arranged around the nucleus in principal energy levels or principal quantum ...
