This section shows links to revision materials Chemistry C3 and C4 (Additional Science) for the OCR Gateway Science exam - J261

C3 - Chemical economics

• Rate of reaction 1 – Reaction times and rates
• Rate of reaction 2 – Reaction rate and changing conditions
• Rate of reaction 3 – Explosions and catalysts, Reacting masses, Percentage yield and atom economy, Energy, Batch or continuous?, Allotropes of carbon and nanochemistry

C4 - The periodic table

• Atomic structure
• Ionic bonding
• Covalent bonding
• The periodic table
• The group 1 elements
• The group 7 elements 
• Transition elements 
• Metal structure and properties
• Purifying and testing water