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Lesson 17: Technicolor Atoms

Lesson 17: Technicolor Atoms. Flame Tests. Discussion Notes. The metal element in each chemical formula appears to be responsible for the flame colors. Only certain elements produce colorful flames.

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Lesson 17: Technicolor Atoms

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  1. Lesson 17: Technicolor Atoms • Flame Tests

  2. Discussion Notes • The metal element in each chemical formula appears to be responsible for the flame colors. • Only certain elements produce colorful flames. • Flame test: A test used in the laboratory to look for the presence of certain metal atoms. A sample of a compound is heated in a flame, and the resulting color is noted.

  3. Discussion Notes (cont.) • Elements and compounds are collections of atoms. • The only way to change one atom into another is to change the nucleus through a nuclear reaction.

  4. Discussion Notes (cont.) • Sodium Atom, Na

  5. Discussion Notes (cont.) • The illustration indicates that the flame colors are associated with movements of the electrons within the sodium atom. • Bohr’s model of the atom came directly from evidence similar to that produced in class today.

  6. Wrap Up • What evidence is there that certain atoms are present in a compound? • Many metal atoms produce a characteristic colored flame when compounds containing those atoms are heated in a flame. • Flame tests are evidence that elements and compounds are collections of atoms.

  7. Check-In Given: Each compound consists of a metal and non-metal. Copper chloride (CuCl2) burns blue-green Sodium chloride (NaCl) burns bright orange Strontium chloride (SrCl2) burns red Potassium chloride (KCl) burns pink lilac Find: • What part of each compound above is responsible for producing the change in flame color? • Predict what color a solution containing a mixture of CuCl2 and SrCl2 will burn in a flame test. Support your explanation with scientific thinking!

  8. Flame Test Analysis Qs • OK to skip analysis questions 1-4 if data table 1 is complete and correct • Complete Qs 5-7, make sure your name is on the packet, and turn it in now.

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