Structure and Function of Materials
Aligned to HS-PS2-6 — Next Generation Science Standards.
What this lesson teaches
A material's behavior comes from how its atoms bond and how electrical forces hold them together. Strong directional bonds make diamond hard; layered bonds let graphite flake; long tangled polymer chains make plastics flexible; free-moving electrons let metals conduct and bend.
Worked example
Table salt (NaCl) forms because a sodium atom gives up one electron and becomes positive while chlorine gains it and becomes negative. The Coulomb attraction between these ions locks them into a rigid cubic lattice, which is why salt crystals are hard and brittle rather than soft.
Practice questions
- Name the type of force that holds the atoms of a designed material together.
- Explain why metals can be bent into wires but ionic crystals shatter, using the arrangement of their particles.
- Choose a material for a phone screen and justify it by describing the atomic bonding that gives the needed property.
Watch the lesson
Every lesson comes with a video taught in English and Spanish — the same video the QR code in the printed workbook opens.
▶ Watch this lessonEn español
Estructura y Función de los Materiales
El comportamiento de un material proviene de cómo se enlazan sus átomos y de cómo las fuerzas eléctricas los mantienen unidos. Los enlaces fuertes y direccionales hacen que el diamante sea duro; los enlaces en capas permiten que el grafito se descame; las cadenas largas y enredadas de polímeros hacen flexibles a los plásticos; los electrones libres permiten que los metales conduzcan y se doblen.
Ejemplo: La sal de mesa (NaCl) se forma porque un átomo de sodio cede un electrón y queda positivo, mientras el cloro lo gana y queda negativo. La atracción de Coulomb entre estos iones los fija en una red cúbica rígida, y por eso los cristales de sal son duros y quebradizos en lugar de blandos.
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