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CONVERSATION STARTER

CONVERSATION STARTER. Chem -to-go Lesson 6: Isotopes and Atomic Mass. Materials: Periodic table and Isotopes & Atomic Mass video notes Unit 2 Practice Packet Pencil and calculator. A Quick History Lesson. Seven Significant Historical Figures: Democritus (~ 400 BC) – “ atomos ”

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CONVERSATION STARTER

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  1. CONVERSATION STARTER Chem-to-go Lesson 6: Isotopes and Atomic Mass Materials: Periodic table and Isotopes & Atomic Mass video notes Unit 2 Practice Packet Pencil and calculator

  2. A Quick History Lesson Seven Significant Historical Figures: Democritus (~ 400 BC) – “atomos” Aristotle (~ 400 BC) – no “atomos” John Dalton (early 1800s) - finally, yes to atoms JJ Thomson (1800s) – Cathode Ray Experiment Ernest Rutherford (1800s) – Gold Foil Experiment Neils Bohr (1913) – Energy levels = planetary atom Heisenberg, Schrodinger, etc. (1920s) = quantum mechanical model

  3. Collaborative Synthesis Experience In my video, I used Legos as an analogy for isotopes. Review the definition and examples of isotopes in your video notes. Brainstorm with your partner, and develop your own analogy for isotopes. Be prepared to share your idea! Students will adapt knowledge to an unpredictable situation.

  4. Collaborative Analysis Experience You have been given a sample of a new element, Dotium. The element was discovered by Emily Jones and Logan Blocksidge yesterday. Use your video notes! When scientists analyze a new element, they look for isotopes. Are all of the atoms of your sample identical to each other? If not, how many isotopes do you have? When different isotopes have been found, scientists separate the isotopes in order to study them. Separate the isotopes of your Dotium sample. Scientists measure the abundance of each isotope. How many atoms of each isotope do you have? How many total atoms of Dotium do you have? Calculate a percent abundance for each isotope. After determining abundance, scientists find a mass for each isotope. Find the mass of each isotope of your Dotium sample. Scientists then calculate the atomic mass to display on the periodic table. Calculate the mass of your Dotium sample. Students will apply knowledge to a real-world situation.

  5. Collaborative Analysis Experience DUE TODAY! Students will apply knowledge to a real-world situation.

  6. Collaborative Analysis Experience • When you have turned in your Candium Lab, please solve the “Atomic Mass Calculations Practice” from your practice packet. • Please show your work on a separate sheet of paper. • Use your video notes and class example to help you! • ADVICE: • #2 doesn’t require any math. • #5 is really tough! I will help you with it if you can’t figure it out. Students will apply knowledge to a real-world situation.

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