AP Chemistry Unit 2 – Atoms, Molecules, and, Ions Day 1 – Check out lab equipment, Chapter 2 Notes, Mass Spectrometry

Warm Up – Find the Mass # Particle 32S 34S 33S 36S-2 16 16 16 16 16 16 GLUE IN AND FILL OUT: The following table in your notebook TIME: 6 MINUTES WHEN DONE: Check your answers with your table partner # Particle 32S 34S 33S 36S-2 # Protons # Electrons # Neutrons 16 16 16 16 16 16 16 18 16 18 17 20

Notice AP Chem Office Hours posted on board AP Chemistry Agenda Finish Checking out lab equipment Lab Notebooks Short Lecture and Video Guided Inquiry: Atomic Number and Atomic Mass OR Work on Homework Problems Next Class: First Major Lab Additional Homework: Read and Annotate Intro to Analysis of Food Dyes Notice AP Chem Office Hours posted on board

Finish Checking Out Lab Equipment FIND A PARTNER: Spread Out to Other Tables THIS PERSON: Will be your lab partner for the school year DECIDE: If you and your partner would like to have an “even” or “odd” numbered bin WRITE: Your Names with Sharpie on all bins WRITE: Fill Empty Bins with 2-3 Paper Towels Each TIME: 7 MINUTES WHEN DONE: Come grab your lab notebook and read over components that need to be in every lab write up

Various Models of the Atom - + + - + Dalton Thomson Rutherford Bohr In one of your preliminary questions, you were asked to identify the experimental evidence that led to the development of the atomic models. Dalton built on the work of other scientists to derive that atoms must combine in whole-number ratios. And that there is nothing smaller than an atom. Thompson then experimented with the cathode ray tubes and magnetic fields, and determined that charged particles must exist within the atoms themselves, giving evidence that we had electrons, a smaller piece to the atom itself.   Later on Rutherford, who is actually Thompson's former student, conducted the gold foil experiment in attempts to verify Thompson's plum pudding model. But instead, he derived that there must be a dense positive nucleus surrounded by negative charge within the atom. And then Bohr used atom emission spectrum of hydrogen specifically to determine that there were quantized energy levels within the electron cloud. Image sources: http://library.thinkquest.org/13394/angielsk/athompd.html http://abyss.uoregon.edu/~js/21st_century_science/lectures/lec11.html http://mail.colonial.net/~hkaiter/astronomyimages1011/hydrogen_emis_spect.jpg http://upload.wikimedia.org/wikipedia/commons/9/97/A_New_System_of_Chemical_Philosophy_fp.jpg

Size of the Atom 1 A = 1 x 10-10 m In one of your preliminary questions, you were asked to identify the experimental evidence that led to the development of the atomic models. Dalton built on the work of other scientists to derive that atoms must combine in whole-number ratios. And that there is nothing smaller than an atom. Thompson then experimented with the cathode ray tubes and magnetic fields, and determined that charged particles must exist within the atoms themselves, giving evidence that we had electrons, a smaller piece to the atom itself.   Later on Rutherford, who is actually Thompson's former student, conducted the gold foil experiment in attempts to verify Thompson's plum pudding model. But instead, he derived that there must be a dense positive nucleus surrounded by negative charge within the atom. And then Bohr used atom emission spectrum of hydrogen specifically to determine that there were quantized energy levels within the electron cloud.

Atomic Numbers, Mass Numbers, Isotopes

Atomic Weights 1 amu = 1.66054 x10-24 g 1 g = 6.02214 x1023 amu Based on the measured and calculated mass of 1 Hydrogen atom Derived from the mass of 1 Hydrogen atom – how many it would take to add up to 1 gram

Mass Spectroscopy Video ON NEW PAGE: Draw and write notes about Mass Spectroscopy from video MAKE SURE TO: Write Flow Chart, Glue in Model, and Sketch Example of Mass Spectrum WHEN DONE: Take out Ch 2 notes and homework https://www.youtube.com/watch?v=mBT73Pesiog

Mass Spectrum of ________

Guided Inquiry: Atomic Number and Mass IF YOU DO NOT HAVE ANY QUESTIONS ON HOMEWORK: Move to Table 5 WITH THIS GROUP: Work on Atomic Number and Atomic Mass Guided Inquiry CTQ = Critical Thinking Questions FOR EXTRA PRACTICE: On Atomic Number and Atomic Mass, check your work on website key TIME: Until End of Class WHEN DONE: Have a fabulous weekend and send a message if you have a question!