8th Grade-Ch. 1 Sec. 1 Elements and Atoms

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8th Grade-Ch. 1 Sec. 1 Elements and Atoms

  1. 1. Ch. 1 Sec. 1 Elements & Atoms
  2. 2. ACTIVITY-NUTS & BOLTS <ul><li>Assemble as many elements & compounds as you can ( at least 15) from the materials provided. </li></ul><ul><li>Draw pictures & name each element & compound. </li></ul>bolt Bl hex nut Hx 1 bolt & 1 hex nut = BlHx
  3. 3. Activity- Nuts & Bolts Naming elements & compounds *Challenge* Make & name a compound with 6 different pieces of hardware! Picture Chemical Symbol Element or Compound small bolt So E large bolt Bb E hex nut (H) Hx E small bolt + hex nut SbH C small bolt + 2 hex nuts SbH 2 C
  4. 4. Activity- Nuts & Bolts Naming elements & compounds Hardware Picture Chemical Symbol Element or Compound
  5. 5. matter <ul><li>anything that has mass & takes up space </li></ul>
  6. 6. elements <ul><li>simplest pure substances </li></ul><ul><li>cannot be broken down into any other substances </li></ul>
  7. 7. Elements are the building blocks of matter.
  8. 8. compounds <ul><li>pure substance made of 2 or more elements chemically combined in a specific ratio </li></ul><ul><li>sugar </li></ul>
  9. 9. mixture <ul><li>2 or more pure substances </li></ul><ul><li>not chemically combined </li></ul>There are two different substances in this mixture.
  10. 10. atom <ul><li>smallest particle of an element </li></ul>
  11. 12. model <ul><li>physical, mental, visual, & other representations of an idea </li></ul><ul><li>to help people understand a concept that they cannot observe directly </li></ul>
  12. 13. scientific theory <ul><li>well-tested idea that explains & connects a wide range of observations </li></ul>
  13. 14. Look in TB on pg. 8 scientist discovery model John Dalton J.J. Thomson negatively charged particles -positively charged particles Ernest Rutherford positively charged nucleus
  14. 16. scientist discovery model Niels Bohr electrons move in certain orbits around nucleus 1920’s scientists electrons can be anywhere in a cloudlike region around nucleus James Chadwick discovered neutron
  15. 17. PARTS OF AN ATOM <ul><li>nucleus = central core of atom </li></ul><ul><li>proton = positive electric charge </li></ul><ul><li>neutron = no charge </li></ul><ul><li>electron = negative charge </li></ul>

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