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BELLRINGER

BELLRINGER. What is the chemical formula for water? Draw what one molecule of water looks like and draw what 5 molecules of water looks like. 1 Molecule H 2 0. 5 Molecules H 2 0. Pictures of the Mind. Macroscopic vs. Microscopic. We live in a macroscopic world.

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BELLRINGER

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  1. BELLRINGER What is the chemical formula for water? Draw what one molecule of water looks like and draw what 5 molecules of water looks like. 1 Molecule H20 5 Molecules H20

  2. Pictures of the Mind

  3. Macroscopic vs. Microscopic • We live in a macroscopic world. • Atoms and elements exist in a microscopic world. • How do atoms in tin foil look or what do atoms in water look like? • Create models or representations to help us understand things.

  4. Anatomy Models

  5. Architecture Models

  6. Biology Models

  7. Model Models?

  8. Chemistry Models

  9. Sample Problem # 1 • Draw a model of a homogenous mixture composed of three different gaseous elements. • Homogenous: Uniform throughout (compound should be intermingled and evenly distributed) • Can the atoms of the elements exist as diatomic molecules?

  10. Answer

  11. Sample Problem # 2 • What kind of matter does the following model represent? Explain your answer!

  12. Answer • This model represents a heterogenous mixture of two molecular substances, each of which consists of two types of atoms.

  13. Sample Problem # 3 • Draw a model of a container of each of the following samples of matter. • Table 1 and Table 7: Mixture of gaseous elements X and Z. • Table 2 and Table 6: A two-atom compound of X and Z. • Table 3 and Table 5: A four atom compound of X and Z • Table 4: A solution composed of a solvent that is a two-atom compound of L and R, and a solute that is a compound composed of two atoms of element D and one atom of element T.

  14. Table 1 & Table 7

  15. Table 2 & Table 6

  16. Table 3 & Table 5

  17. Table 4

  18. Sample Problem # 4 • Answer Question #4 on your handout!

  19. Sample Problem # 5 • The element Iodine (I) has a greater density in its solid state than its gaseous state. Draw models that depict and account for this difference at the particulate (really small!) scale. Iodine normally exists as a two-atom molecule.

  20. Answer # 5

  21. Sample Problem # 5 • A chemistry student at Riverwood High School was asked to draw a model of a mixture composed of an element and a compound. Comment on the usefulness of the students drawing.

  22. Answer # 6

  23. Sample Problem # 7 Finish Up Sample Problem # 7 in your group. Remember to turn the packet in before you leave. If you didn’t finish it then it is homework.

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