Summary of Material Properties and Periodic Table

## Introduction Materials are chosen for different jobs because of their properties. A property is a characteristic that helps us tell one material from another and decide how suitable it is for a use. This guide explains common material properties in clear steps, gives examples and applications, and offers memory tips to help you remember them. ## What is a property? > A property is a characteristic of a material that describes how it behaves or how it can be used. ### Grouping the material properties Break the list of properties into types to make them easier to remember: - Mechanical properties: describe how a material responds to forces (hard, soft, brittle, malleable, ductile, sonorous) - Thermal and electrical behaviour: how heat and electricity pass through a material (conductor, insulator) - Chemical behaviour: how a material reacts with others (reactive, unreactive, acidic, alkaline) - Physical/optical appearance: how the material looks or feels (shiny, dull, density, magnetic, boiling point, melting point) ## Key properties explained (with examples and uses) ### Mechanical properties - **Hard** > A material that is firm and not easily broken, cut, or pierced. - Example: A ceramic tile is hard so it resists scratches. - Use: Cutting tools, protective coatings. - **Soft** > A material that is easy to mould, cut, or fold; not firm to touch. - Example: Clay is soft and easy to shape. - Use: Modelling, cushions, packaging. - **Brittle** > A material that is hard but easily broken. - Example: Glass is brittle; it can shatter under impact. - Use consideration: Not good where impacts happen. - **Malleable** > A material that can be hammered or pressed into different shapes. - Example: Gold is malleable; it can be made into thin sheets (gold leaf). - Use: Jewellery, metal forming. - **Ductile** > A material that can be stretched into wires. - Example: Copper is ductile; used for electrical wires. - Use: Wires, springs. - **Sonorous** > A material that makes a ringing sound when dropped or hit. - Example: Bells are made from sonorous metals like bronze. - Use: Musical instruments. ### Thermal and electrical behaviour - **Conductor** > A material that electricity and heat can pass through easily. - Example: Copper conducts electricity well; used in wiring. - Use: Electrical cables, cooking pans (heat conduction). - **Insulator** > A material that electricity and heat cannot pass through easily. - Example: Plastic handles on pans prevent heat transfer to your hand. - Use: Electrical insulation, thermal barriers. ### Chemical behaviour and pH - **Acidic** > A solution formed when an acid is dissolved in water; has pH less than 7. - Example: Vinegar is acidic and can react with some metals. - Use: Cleaning, chemical reactions where acid is needed. - **Alkaline** > A solution formed when an alkali is dissolved in water; has pH more than 7. - Example: Soap solutions are often alkaline. - Use: Cleaning, neutralising acids. - **Reactive / Unreactive** > Reactive: a substance that reacts with others easily; Unreactive: a substance that does not react easily. - Example reactive: Sodium reacts violently with water. Example unreactive: Noble gases (do not react easily). - Use: Choose unreactive materials for containers of reactive chemicals. ### Physical and optical properties - **Shiny** > A surface which reflects light; you can sometimes see your reflection. - Example: Polished metal looks shiny. - Use: Mirrors, decorative surfaces. - **Dull** > A surface which does not reflect light; not shiny. - Example: Matte paint is dull and reduces glare. - Use: Reducing reflections, camouflage. - **Magnetic** > A material that can be attracted by a magnet or made into a magnet. - Example: Iron is magnetic; used in motors and lifts. - Use: Electric motors, compasses, magnetic fasteners. - **Density** > The mass of a substance divided by its volume; measured in kilograms per