Some key content:

• Atoms, elements, and compounds are the basic building blocks of matter.
• ThePeriodic Table organises elements by increasing atomic number and reveals patterns in their properties.
• Ionic, covalent, and metallic bonds determine the structure and properties of substances.
• Chemical reactions involve the rearrangement of atoms to form new substances, often with energy changes.
• Chemical equations represent reactions and must be balanced to obey the law of conservation of mass.
• Quantitative chemistry calculates reactants and products using the mole concept.
• Filtration, crystallisation, distillation, and chromatography separate and purify substances.
• Solids, liquids, and gases have different particle arrangements and energies, with state changes occurring due to energy changes.
• Acids release H⁺ ions, alkalis release OH⁻ ions.
• Organic chemistry studies carbon-containing compounds.
• Electrolysis uses electricity to drive chemical reactions.
• Rates of reaction are influenced by temperature, concentration, surface area, and catalysts.
• Metals are extracted from ores using reduction with carbon or electrolysis.
• Hydrocarbons are compounds containing hydrogen and carbon atoms only.
• Crude oil is refined into useful products like petrol and diesel.
• The Earth's atmosphere is composed of gases like nitrogen, oxygen, and carbon dioxide.