01:160:171 Lecture 13: Magnetic Behavior

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purplewasp23

20 Jan 2019

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In this experiment, we determine whether multiple substances are paramagnetic or diamagnetic. Paramagnetic for paramagnetic substances, the material has unpaired electrons. For example, c has the spdf notation of 1s22s22p2. This makes the p orbital have 2 unpaired electrons. The p orbital has all 6 electrons, so there are 0 unpaired. Do not open the vials, as some contents are toxic and carcinogenic: obtain ten sealed vials. Nine of the vials will contain knowns, while the last vial will be an unknown. This unknown will be one of the previous nine: zero the analytical balance, then place the magnet on the balance and record its apparent mass; the magnet can be found next to the balance. The term apparent mass is used since there will be some interaction between the magnet and the balance altering the measurement. Record this value in the data sheet: elevate the vial containing the sample approximately 0. 5 cm above the magnet.

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THIS IS THE EXPERIMENT:

The students, working in pairs, will obtain ten sealed vials. DO NOT OPEN THE VIALS! Having the vials preloaded saves chemicals, time, and minimizes the possibility of exposure. These vials are labeled with their contents. Nine of the vials will contain knowns, while the last vial will be an unknown. This unknown will be one of the previous nine. Zero the analytical balance, then place the magnet on the balance and record its apparent mass; the magnet can be found next to the balance. The term apparent mass is used since there will be some interaction between the magnet and the balance altering the measurement. Record this value in the data sheet. Elevate the vial containing the sample approximately 0.5 cm above the magnet. Do not allow the vial to touch the balance or the magnet for this will alter the reading. Record the newly displayed mass in the data sheet. If the apparent mass has decreased in the presence of the sample, then the sample is attracting 4 the magnet, and the sample is paramagnetic. If the apparent mass has increased in the presence of the sample then the sample is being repelled by the magnet; consequentially the magnet is also being repelled, and the sample is diamagnetic. Perform two measurements then return to your lab bench and calculate the number of unpaired electrons for those two samples based on the oxidation numbers of the elements. Repeat until all samples have been measured.

THIS IS THE QUESTION:

This same experiment is performed on the international space station. What is the primary issue with performing this experiment in the absence of gravity? Design an experiment to compensate for this. As always, you do have duct tape

01:160:171 Lecture 13: Magnetic Behavior

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