Year 11 Chemistry Notes: Properties and Uses of Materials

Material Properties & Applications: Key Points

Properties Drive Uses: Understand how solubility, thermal/electrical conductivity, and melting/boiling points determine material applications.

Chemical vs. Physical Properties: Chemical properties are observed when a new substance forms (e.g., flammability). Physical properties are observed without changing the substance (e.g., temperature).

Thermal Conductivity: This refers to heat transfer. Metals have high thermal conductivity, while materials like rubber have low conductivity.

Electrical Conductivity: This involves the flow of electrons (as seen in copper) or ions (in electrolytes).

Melting and Boiling Points: High melting points are essential for high-heat applications. Boiling points influence a material's use as a solvent.

Solubility: This describes how much of a substance dissolves, influenced by temperature.

Density: Understanding mass/volume relationships helps predict whether a substance will sink or float.

Mixture Separation: Utilize methods like filtration (particle size), evaporation, distillation (boiling point), and decanting (density) to separate mixtures.

Nanomaterials (1-100nm): These exhibit unique properties and high surface area, leading to increased reactivity.