Free About 1 hr0 learners Rev. 2026-10-21 0

Table salt is made from a soft metal that bursts into flame in water and a green gas that was used as a weapon in the First World War. Bonded together, they turn into something you sprinkle on your dinner. That transformation is the everyday miracle of chemistry: the same hundred or so kinds of atom, joined in different ways, give you rust and rubies, sugar and gasoline, the protein in your muscles and the plastic in your pen.

You will see why the periodic table could predict elements nobody had found, why ice floats and oil refuses to mix with water, how a pinch of flour dust can level a mill, and why one mirror-image molecule can heal while its twin does harm. Chemistry also asks hard questions of the people who use it. The man who learned to pull fertilizer out of the air also launched gas warfare, and the inventor of leaded gasoline went on to create the chemicals that tore a hole in the ozone layer. By the end, the labels on your cleaning shelf and the headlines about pollution and treaties should make a good deal more sense.

Levels

  1. 1 1. Atoms and Elements 5-question quiz
  2. 2 2. The Periodic Table 5-question quiz
  3. 3 3. Chemical Bonds 5-question quiz
  4. 4 4. Reactions and Energy 5-question quiz
  5. 5 5. Water, Acids and Bases 5-question quiz
  6. 6 6. Carbon and the Chemistry of Life 5-question quiz
  7. 7 7. Materials and Everyday Chemistry 5-question quiz
  8. 8 8. Chemistry and Society 5-question quiz

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