Final Review

Chemistry 120 Final Exam Review 1. A rabid goose is charging you, knowing that geese hate nomenclature name or draw the following compounds. A. KClO B. Ammonium perchlorate B. Sodium bicarbonate F. CaC2O4 C. Nitric Acid K. Nitrous Acid D. H3PO4 P. CH3(CH2)8CH2OH E. Butanoic acid H. Ethyl Acetate 2. After graduating you are hired as a henchman for a mad scientist who asks you to fill out the following table, how much raw Uranium does he needs to mine to get 15 pounds of the far less radioactive 234U ? Isotope Mass Abundance Mass contribution Average mass 234U 234.0409 amu 0.006 % 235U 235.0439 amu 0.725 % 238U 238.508 amu 99.269 % 3. Your boss who is still mostly mad has shifted his focus from Uranium to his vitamins which he has mixed up with his poisons, using the elemental composition determine if your sample is Vitamin A C20HBOC or Warfarin C19HYOZ. Given an elemental analysis of 74.01% C, 5.23% H, 20.76% O 4. Now that you know you have warfarin your boss wants you to make two solutions using it, the 1st being 700 mL of 4 M (a toxic molarity) and the second being a dilution of the first solution to make 50 mL of a 0.250M solution (a non toxic molarity) how many grams will you need and how much of the first solution is used to make the second. 5. Your mad scientist boss has developed a new method of filtration and intends to steal all the salt from the ocean, as a diligent henchman you decide to test the device on a test ocean with 1.37 billion cubic km of water with 35g NaCl per 1 kg water, what is the molarity of the ocean and how many 100 metric ton silos will you need to allocate for the salt ransoming. 6. After working with all that salt you decide to leave your henchman job so you go to work for an eccentric billionaire who wants his house to smell like rotten eggs, to this end he gives you Barium sulfide and any other material you want. Write out a total and net ionic equation to make his dreams come true. 7. Your new boss has decided that he wants his car welded onto his private jet so he can test his new windshield wipers out in cloudy weather, you carry out a thermite reaction but your boss calls you a witch and won?t get in the car until you explain how you did it, tell him what is being oxidized and what is being reduced in the reaction (2 Al + Fe2O3 2 Fe (l) + Al2O3) After explaining what is being oxidized and what is being reduced if you have 32kg Fe2O3 and 32kg of powdered aluminum what is the limiting reactant and the theoretical yield of liquid iron? 8. Worried that the cook is poisoning him the billionaire now wants you to make sure that the vinegar isn?t actually magic acid (SbF5 and HF) using an 8M NaOH solution you titrate 10 mL of the vinegar and find that it takes 26 mL of the basic solution, is the chef trying to kill him ? 9. After the incident with the chef your boss went into seclusion in his hyperbaric chamber the butler tells you he will fill the chamber (volume 100 L) with ideal compressed air, when you come back in the morning (8 hours later) the temperature is 73°F and the pressure meter reads 2.91 atm. Knowing that your boss goes through 2.1 moles of oxygen per hour do you really want to open the door to the chamber ? 10. After the untimely demise of your previous boss you get a job working for a ?President for life? on a small volcanic Island, He asks you to tutor his son in a few important chemical reactions, show him how to finish and balance the following equations. A. KCN + H PO4 + K PO4 B. The combustion of butane in air C. The reduction of Hydrogen peroxide in the presence of ferrous ions D. The Neutralization of Hydrochloric acid with Cesium hydroxide 11. After you did such a good job teaching the presidents son he asks you to calculate the amount of Methylhydrazine CH6N2 (q = -1.30 X 103 kJ/mol) he must burn to heat his hot tub which holds 600L of water, if the water is flown in as a chunk from an iceberg and the president wants the temperature at 105°F 12. The Villagers from the Island have rebelled against the president and his son, you have fled with some of the other help but your now trapped in a cave and you need to heat the cave given the following reactions will you succeed in heating the cave or die in frozen agony ? ( NO(g) + O(g) NO2(g) ) ?H = ?? NO(g) + O3(g) NO2(g) +O2(g) ?H = -198.9 kJ O3(g) 32 O2 (g) ?H = -142.3 kJ O2 (g) 2O (g) ?H = 495 kJ 13. After a few days of rioting the villagers were subdued by the presidential protection forces, the president is now concerned about his safety and asks you to develop a radio signal interceptor, given that radio signal wavelengths range from 0.01 to 10000m in wavelength what frequencies will you need to intercept ? 14. One night while listening on the radio signal interceptor you built a message arrives from the CIA asking you to design an experiment based on energy levels in Hydrogen to distract the president while they sneak into his office to steal some sensitive documents, Create a black light ?= 252 nm to impress the president by dropping hydrogen atoms from an unknown energy level to their 2nd energy level (B for H is 2.179 X 10-19J). 15. After the CIA break in the villagers ask for your help in overthrowing the president, to do so they will need some magnets to ruin the metal detectors at the palace, which of the following species has the most unpaired electrons and as such the strongest ferromagnetic properties ? Cr, Eu, Si, N, Mg, Al, Zn 16. After helping the villagers overthrow the president your search for a new job is interrupted by a crazed mongoose, knowing that cobras use Lewis structure to fight off the mongoose give Lewis diagrams, molecular geometries, bond angles and hybrid orbital sets for the following compounds. A. Carbon Tetrachloride F. MgCl2 B. BF3 G. Seaborgorium Hydride C. BrF3 H. [NO2]- D. SnCl3 I. IF5 E. Phosphorus pentafluoride J. KrF4 17. After scaring off the mongoose your first boss contacts you for a new consulting position, he needs to figure out how much energy it will take to vaporize 500kg of his new scheme Dr. X?s super disinfectining agent (100% ethanol) knowing the ?Hvapn is 43.3 kJ/mol how much heat is needed 18. After your consultant job, you are offered a position as a TA at a Middle American University, you first job will be to organize a review session for a final exam, one the final question you run out of wacky scenarios to ask questions about so explain the following concepts and give examples A. Hydrogen bonding B. Dispersion forces C. Dipole - Dipole interactions D. Intermolecular forces effects on vapor pressure, melting point, boiling point and surface tension Stuff: Molarity ? = ?????? Dilutions ?1?1 = ?2?2 Density ? = ?? Boyles law ?1?1 = ?2?2 Charles Law ?1? 1 = ?2? 2 Combined Gas Law ?1?1? 1?1 = ?2?2? 2?2 Ideal Gas Law ?? = ??? Molecular mass determination ? = ????? = ???? Molar Fraction ?1 = ?1? ???? ? Partial pressure ?1 = ?1?????? Specific Heat ?? = ???? Frequency and wavelength ?? = ? Photon energy E = h? ?Hvap = mol X kJ energy required Standard Temperature Pressure 1 atm, 273.15 K Double bonds have no rotation Density of water is 1 g/mL SH water 4.184 J/g C Lone electron pairs and multiple bonds occupy more space than sigma bonds Pi bonds are the overlap of two half filled unhybridized P orbitals sigma bonds are the end to end overlap of two orbitals regardless of type Jynx