AQA A Level Chemistry复习笔记1.9.1 Oxidation & Reduction
Oxidation & Reduction There are three definitions of oxidation and reduction used in different branches of chemistry Oxidation and reduction can be used to describe any of the following proces...
AQA A Level Chemistry复习笔记1.8.1 Chemical Equilibria
Reversible Reactions & Dynamic Equilibrium Reversible reaction Some reactions go to completion where the reactants are used up to form the products and the reaction stops when all of the reacta...
AQA A Level Chemistry复习笔记1.7.1 Collision Theory
Collision Theory Collision theory The collision theory states that for a chemical reaction to take place the particles need to collide with each other in the correct orientation and with enough ene...
AQA A Level Chemistry复习笔记1.6.1 Bond Energy
Bond Energy During a reaction, enthalpy changes take place because bonds are being broken and formed Energy (in the form of heat) is needed to overcome attractive forces between atoms Bond breaking...
AQA A Level Chemistry复习笔记1.5.1 Shapes of Simple Molecules & Ions
Electron Pairs The valence shell electron pair repulsion theory (VSEPR) predicts the shape and bond angles of molecules Electrons are negatively charged and will repel other electrons when close to...
AQA A Level Chemistry复习笔记1.4.1 Changes in State: Energy Changes
State Changes Changes of state are physical changes that are reversible These changes do not change the chemical properties or chemical makeup of the substances involved Vaporization includes evapo...
AQA A Level Chemistry复习笔记1.3.1 The Mole & the 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...
AQA A Level Chemistry复习笔记1.2.1 Relative Atomic Mass & Relative Molecular Mass
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...
AQA A Level Chemistry复习笔记1.1.1 Fundamental Particles
Structure of an Atom All matter is composed of atoms, which are the smallest parts of an element that can take place in chemical reactions Atoms are mostly made up of empty space around a very smal...
