FinalReviewStepUpWorksheet_F23 (1)

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University of California, Los Angeles *

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14A

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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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