Best Ever Q&A Space Our World Nature History Science & Technology Human Body Senses & Organs Science of Life Chemicals & Matter Atoms & Molecules Materials Forces & Energy Sound Electricity & Magnetism Heat & Light Everyday Science Industry Transportation Computers Machines Ships Undersea Exploration Land Travel Cars Flight Structures Buildings Farming	Chemicals & Matter What are crystals? How are chemicals made? How do soaps and detergents work? What chemicals are used in fire extinguishers? What is the difference between a mixture and a compound? What are molecules? What is chemical analysis?   Previous: Back to Chemicals & Matter Book: Best Ever Q&A Section: Science & Technology Chapter: Chemicals & Matter