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Elements and Compounds

Elements and Compounds. Atoms are the fundamental building blocks of the universe. They can be joined together by chemical bonds. From last lesson: Atoms can have different numbers of protons, neutrons and electrons. There are 118 different types of atoms.

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Elements and Compounds

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  1. Elements and Compounds

  2. Atoms are the fundamental building blocks of the universe. • They can be joined together by chemical bonds

  3. From last lesson: • Atoms can have different numbers of protons, neutrons and electrons. • There are 118 different types of atoms. • They can be found on the periodic table of elements.

  4. If something is made of the same type of atom then it is called an element

  5. Complete questions 1-9 on your sheet • Extension: find the periodic table of elements in the back of your link book. Start thinking about all the things on it that you notice

  6. The 118 different types of atom all have a name and a special symbol • These can be found on the Periodic Table of Elements

  7. When different things are together but not chemically bonded, the result is called a mixture

  8. Types of Substance

  9. If between 2 and 100 atoms are chemically bonded together, the substance is called a molecule • They can be the same atoms or different ones!

  10. Q10-15 in booklet

  11. Molecular Substances

  12. Each substance has a chemical formula. • This tells you which atoms the molecules are made of • For example, water’s chemical formula is H2O. This means each molecule has two hydrogen atoms and one oxygen atom chemically bonded together. • Molecules have between two and a hundred atoms

  13. Fill in the gaps on the worksheet • Start reading ahead in the worksheet

  14. Atoms of which elements, and how many of them, are in: H2 O2 H2O CH4 CO2 Q17-25

  15. Giant structures

  16. In one kg of iron there are 1.1x1025 atoms That means in one kg of iron there are: 11000000000000000000000000 atoms

  17. These atoms are all chemically bonded – billions and billions of them on and on and on. This is called a giant structure

  18. Giant structures can be elements or compounds Iron Iron oxide

  19. Complete the next fill in the gaps on the sheet • Start reading ahead

  20. We can also write chemical formulae for giant structures • E.g. aluminium oxide is Al2O3 • It has two aluminium atoms and three oxygen atoms • Q26-33

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