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SubjectPaid lesson

CHEMICALS

ClassNotes Team 3 MIN READUPDATED 13 JUN 2026

Basic Science JSS2 Third Term

WEEK THREE

CHEMICALS

Content

REFERENCE
Precious seed BASIC SCIENCE FOR JUNIOR SECONDARY SCHOOLS BOOK 2

CHEMICALS

A substance composed of chemical elements or a substance produced by or used in chemical processes. Chemical classes are groupings that relate chemicals by similar features. Chemicals can be classified by their structure (e.g., hydrocarbons), uses (e.g., pesticides), physical properties (e.g., volatile organic compounds [VOCs]), radiological properties (e.g., radioactive materials), or other factors. The chemical classes identified below are ones used by the Agency for Toxic Substances and Disease Registry (ATSDR) to address hazardous substances.

Classes of Chemicals

Based on use

  1. Pharmaceutical/cosmetics e.g. Mood stabilizers: lithium and valpromide
  • Hormone replacements: Premarin
  • Oral contraceptives: Enovid, "biphasic" pill, and "triphasic" pill
  • …