Elements, Compounds & Mixtures Fall 2012


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Elements, Compounds & Mixtures Fall 2012

  1. 1. You Will Need: 1. Pencil, Colored pencils 2. Mass, Volume and Density Review Labs- Due now 3. Assignment Log #4 – Update w/new assignment 4. Elements, Compounds and Mixtures – 1 sheet 2 sides – Bookshelf – This is only Part 1
  2. 2. Test #3 Retakes 1. 2 opportunities remainUpdate Log #4 1. Bohr Model & Wave Model + Electrons and Bonding Returned today 2. Assignment Log #4 – Update w/new assignment
  3. 3. 1. Elements are pure substances made of only one kind of atom.2. As we have learned, atoms are tiny structures found in all matter.3. Most substances contain many different atoms.4. It is how those atoms are arranged that determine whether you have an element, compound or mixture.
  4. 4. 1. One kind of atom2. Pure (because all particles are the same)3. Smallest particle to retain identity of the element4. Separated only in nuclear reactions
  5. 5. Particles look like: Every atom looks8 exactly the same 8 w/ the same 8 number of protons Oxygen 1 1 1 Hydrogen
  6. 6. Example: Aluminum: Every atom of aluminum in this can is exactly the same Your Example?
  7. 7. 1. Two or more kinds of atoms chemically bonded2. Pure (because all particles are the same)3. Smallest particle to retain the identity of the compound (SET RATIO of particles) CO4. Separated or rearranged in chemical reactions 2
  8. 8. Particles look like: Every compound looks exactly the same w/ the same set ratio Carbon Dioxide – CO2 Sodium Chloride - NaCl
  9. 9. Example: Salt: Every molecule of the compound NaCl is exactly the same Your Example?
  10. 10. 1. Two or more elements and/or compounds blended together physically2. Not pure (because all the particles are not the same)3. Separation through distillation, magnetic, evaporation, density, or particle size4. No set ratio
  11. 11. Particles look like: Each particle keeps its own identity….they are just “blended” together Mixture #1 Mixture #2
  12. 12. Examples: Heterogeneous: Different components are easy to see in this type of blending Homogeneous: Different components are difficult to see because they are evenly distributed Your Examples?
  13. 13. Compound
  14. 14. Mixture
  15. 15. 1. A solution is a mixture where all the components blend together to look like one substance.2. A solution is a homogeneous mixture that appears to be a single substance.3. The solution is composed of particles of two or more substances that are distributed evenly among each other and have the same appearance and properties throughout.
  16. 16. 1. In solutions, the SOLUTE is the substance that is being dissolved and usually is the smaller quantity in the mixture.2. The SOLVENT is the substance in which the solute is dissolved and usually is the larger quantity in the mixture.3. It is the SOLVENT that is doing the dissolving.4. Go to page 144-145 in your textbook: Give examples of solutions in various states.
  17. 17. • Homogeneous: 2 or more things evenly blended and disappear into each other.• Solute – Smaller quantity by %• Solvent – Larger quantity by %• Solution – a homogeneous mixture
  18. 18. • Heterogeneous: 2 or more things put together and still can be seen.• No set RATIO.
  19. 19. Have you ever put sugar into lemonade and seen the grains of sugar sink to the bottom and not dissolve?This is because the lemonade (solution) is supersaturated. In other words, there is not enough water (solvent) to completely dissolve the sugar (solute).Temperature and Pressure can affect saturation levels.
  20. 20. Saturation Level What does this What does this look mean? like? (color)Unsaturated •Mixture contains more solvent than solute •Able to dissolve more soluteSaturated •Mixture contains the % of solute completely dissolved by solvent •No able to dissolve more soluteSupersaturated •Mixture contains the % of solute unable to be dissolved by the % of solvent at the given temp. High temp usually = higher solubility
  21. 21. 1. We now know the definition of Element, Compounds & Mixtures2. What do their particles look like?
  22. 22. 1. Elements, Compounds & Mixtures - To be “on-time” Pgs. 1 & 2