This PowerPoint lesson introduces polymers and explains how their structure determines their physical properties, helping IBDP Chemistry students link covalent bonding to real-world materials. Designed for first assessment 2025, it builds a clear understanding of macromolecules, intermolecular forces and structure–property relationships.
A polymer is a large molecule (macromolecule) formed from many repeating small units called monomers joined by covalent bonds. This lesson defines key terms such as polymer, monomer, structural formula, synthetic polymer and natural polymer, and shows how repeating units are represented using bracket notation and the variable n. Students explore how carbon’s four valence electrons enable the formation of long covalent chains, forming the backbone of most common plastics.
The properties of plastics are explained directly in terms of structure. Strong covalent bonds along each chain provide durability, while weaker intermolecular forces between chains (London dispersion forces, dipole–dipole interactions and hydrogen bonding) control flexibility, rigidity and melting behaviour. Comparisons between polyethene, PVC and Kevlar illustrate how different intermolecular forces lead to very different material properties.
The lesson also compares polymers with molecular solids and giant covalent networks, reinforcing classification skills. Sustainability and environmental context are included through discussion of bioplastics, waste accumulation and global consumption issues.
Starter activities, structured explanations, real-world examples and discussion prompts are included, making this resource ideal for classroom teaching, consolidation or revision.
File type included: PowerPoint (.pptx)
Last updated: January 2026 – sustainability context expanded and structure–property explanations refined in line with the 2025 IB Chemistry syllabus.
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