Delivering the programme
S3.1 Periodic table (1) - classification of elements
This introductory section to the periodic table shows how the 118 elements are arranged vertically into groups, horizontally into periods and separated into s, p, d and f blocks. The importance of electron...
Delivering the programme
S2.4 (AHL) From models to materials
This section builds upon S2.4 From models to materials by extending it to cover condensation polymers. It includes natural examples of polyamides and polysaccharides and man-made examples of polyamides...
Delivering the programme
S2.4 From models to materials
S2.4 From models to materials describes the properties of materials such as melting point, electrical conductivity, thermal conductivity and malleability and how they are related to their bonding and...
Delivering the programme
S2.3 The metallic model
This section describes the bonding in metals, what the strength of the metallic bond depends upon and how this affects their melting point, electrical conductivity, thermal conductivity and malleability....
Delivering the programme
S2.2 (AHL) The covalent model (2)
This is the second part of the Additional Higher Level material on S2.2 The covalent model. It covers the concept of combining atomic orbitals to form molecular orbitals resulting in sigma and pi bonds....
Delivering the programme
S2.2 (AHL) The covalent model (1)
This is the first part of the Additional Higher Level material on S2.2 The covalent model. It covers the concept of resonance hybrids using benzene as a specific example, and also the concept of formal...
Delivering the programme
S2.2 The covalent model (3)
This is the third part of S2.2 The covalent model. It covers the structure and properties of silicon, silicon dioxide and the allotropes of carbon. It also covers the factors that affect the strength...
Delivering the programme
S2.2 The covalent model (2)
This is the second part of S2.2 The covalent model and looks at VSEPR theory to determine the shapes of simple molecules and ions. Since the underlying theory is the same it also includes 5 and 6 electrons...
Delivering the programme
S2.2 The covalent model (1)
This is the first of three pages to cover covalent bonding at SL/HL. This section looks at how covalent bonds are formed and covers single and multiple bonds and coordination bonding. It includes the...
Delivering the programme
S2.1 The ionic model
This section covers the electrostatic attraction between oppositely charged ions to form ionic compounds. It includes the physical properties of ionic compounds, their names and formulas and the three-dimensional...