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Elements, Compounds and Mixtures.

Elements, Compounds and Mixtures. Chapter 16. Classification of Substances. Elements Molecules Compounds Mixtures. Elements. Elements are substances made up of only one type of atom. Example  Hydrogen, Gold. Periodic Table of Elements. Molecule .

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Elements, Compounds and Mixtures.

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  1. Elements, Compounds and Mixtures. Chapter 16

  2. Classification of Substances • Elements • Molecules • Compounds • Mixtures.

  3. Elements • Elements are substances made up of only one type of atom. • Example  Hydrogen, Gold.

  4. Periodic Table of Elements

  5. Molecule • A molecule is made up of two or more atoms chemically combined.

  6. Compounds • Compounds are made up of two or more different types of atoms chemically combined.

  7. Properties of Compounds • When a compound is formed during a chemical reaction its properties differ from those of the elements from which it is made. • Example: Water is made from hydrogen and oxygen. Hydrogen  flammable gas Oxygen  colourless gas.

  8. Diagram of Salt, water, sucrose.

  9. Mixtures • A mixture consists of two or more different substances mingled together but not chemically combined. • Examples: Sea – water and salt Air – nitrogen, oxygen … Soil – sand, clay, humus …

  10. Compare mixtures and Compounds.

  11. iron particles Key: one iron particle strong bonds between iron particles iron particlesheld together by strong bonds

  12. iron particles iron particles are attracted to a magnet iron particlesdiagram

  13. sulfur particles Key: one sulfur particle strong bonds between sulfur particles sulfur particles held together by strong bonds

  14. sulfur particles sulfur particles are not attracted to a magnet sulfur particlesdiagram

  15. iron particles sulfur particles

  16. A mixtureof iron and sulfur particles What’s this? strong bonds between sulfur particles strong bonds betweeniron particles

  17. A mixtureof iron and sulfur particles A magnet attracts the iron particles but not the sulfur particles. The mixture is separated mixture diagram

  18. What’s this? A compound between iron and sulfur particles one sulfur particle one iron particle strong bonds between iron and sulfur particles

  19. A compound between iron and sulfur particles strong bonds between iron and sulfur particles The magnet cannot separate iron and sulfur particles in a compound compound diagram

  20. References Steve Lewis for the Royal Society of Chemistry Photographs by Peter Hollamby

  21. A

  22. B

  23. C

  24. D

  25. E

  26. F

  27. G

  28. H

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