FinalReviewStepUpWorksheet_F23 (1)

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Chemistry

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Jun 11, 2024

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Final Review Step Up Worksheet 1. In an experiment, a student found that the energy needed to dislodge electrons from a metal is 3.16 eV (1 eV = 1.602 x 10 -19 J). Calculate the velocity of the emitted electrons when she employed light with a wavelength of 309 nm. 2. Provide the electron configurations for the following elements a. V b. Cu c. N d. Cs +2 e. Se -2

3. Saline solution is commonly used for intravenous administration of drugs in medical settings. The molar mass of sodium chloride is 58.44 g/mol a. If seawater has a NaCl concentration of 0.600M, how many grams of NaCl would 300 mL of seawater contain? b. If sea water from part a were diluted down to saline solution with a concentration of 0.154 M, what volume(mL) of sea water is needed in order to make 1.4 L of saline solution? 4. Photosynthesis is essential for life: plants convert CO 2 and H 2 O into glucose (C 6 H 12 O 6 ), a primary source of energy, and oxygen, which is needed for respiration. If 20.00g of CO 2 reacts to form 50.0 mg of glucose, what is the limiting reagent and how much of it was initially present? Molar mass of glucose = 180.156 g/mol 6CO 2 + 6H 2 O → C 6 H 12 O 6 + 6O 2

5. An unknown compound was found to have a percent composition as follows: 47.0% potassium, 14.5% carbon, and 38.5% oxygen. a. What is its empirical formula? b. If the molar mass is 166.22 g/mol, what is its molecular formula? 6. A marble has a mass of 1.5 g. a. Find the uncertainty in the position of the marble given that its speed is known to within ± 0.55 m/s b. If the speed of the marble is 3.5 m/s, what is its wavelength? c. Does the marble have measurable wavelike properties?

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7. Which of the following is a possible set of quantum numbers? Explain why the others are incorrect. a. 3, 2, -3, -½ b. 0, 0, 0, +½ c. 4, 2, -1, 0 d. 3, 1, -1, +½ e. 4, -3, -1, -½ 8. For the following, the “X” atoms are the same. Provide Lewis structures, shape, polarity, and hybridization a. AX 3 E 2 b. AX 5 E c. AX 2 E 2 d. AX 3

9. Caffeine is an alkaloid found in coffee and teas and is a powerful stimulant of that central nervous system. Label all sigma and pi bonds and the total number of hydrogen bonding sites. 10. Using curly arrows, draw the Lewis acid base reaction between NH 3 and AlCl 3 . Label the Lewis acid and base 11. Earth’s atmosphere contains very high levels of oxygen O 2 but low levels of ozone O 3 . a. Draw the Lewis structures for both compounds b. Would you expect ozone to have two bond lengths that are the same or different? Why? c. Which molecule would have the strongest bond? Why?

12. Neon and HF have approximately the same molecular masses. a. Explain why the boiling points of Neon and HF differ. b. Which would you expect to have a higher boiling point? 13. Arrange the following sets of compounds in order of increasing boiling point temps: a. HCl, H 2 O, SiH 4 b. CH 4 , C 2 H 6 , C 3 H 8 c. N 2 , O 2 , NO

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14. Refer to the heme complex structure provided a. What is the coordination number of the iron? b. What is the expected geometry for this compound? c. The porphyrin ligand is acting as a _______ dentate. d. Is the porphyrin ligand a chelating ligand? 15. Provide the formulas for the following coordination complexes: a. Triamminetriaquachromium (III) chloride b. Tetraamminedichloroplatinum(IV) tetrachloroplatinate(II) c. Bis(en)diiodomanganese (IV) ion

16. Provide the names for the following coordination complexes: a. K 2 [Ni(CN) 4 ] b. [Co(NH 2 CH 2 CH 2 NH 2 ) 2 (CN)(Cl)]Cl c. [Cr(ox)(Cl) 3 ] -

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