What Is Chemistry?
Learn what chemistry studies and why it matters daily.
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Chemistry is the Science of Matter
Chemistry studies what matter is made of, how substances change, and what new substances form.
Matter and Substances
- Element — one kind of atom (e.g., oxygen, iron).
- Compound — two or more elements chemically joined (e.g., water H₂O, salt NaCl).
- Mixture — substances mixed but not chemically joined (e.g., air, sand and salt).
Chemistry in Daily Life
Cooking is chemistry — heat changes food. Medicines work through chemical reactions. Even cleaning uses chemicals!
Chemical change example: when iron rusts, or when wood burns, new substances form. These are chemical (not just physical) changes.
Practice
Classify: gold, table salt, air, sugar, iron, sea water as element, compound or mixture. Check the table above for a clue.
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Course contents
Introduction to Chemistry
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