<p>Semester Review Worksheet #2 What is pH a measure of? </p><p>1. What is the equation used for finding pH? </p><p>2. What is pOH a measure of?</p><p>3. What is the equation for finding pOH?</p><p>4. What is the equation that relates to pH and pOH? </p><p>5. What is the equation that relates [H+] and [OH-]?</p><p>6. Complete the following table</p><p>+ - [H3O ] [OH ] pH pOH Acidic/Basic? 1.0 x 10-9 M 4.1x10-2 M 3.75 5.45</p><p>7. How many joules are needed to warm 25.5 grams of water from 14.0oC to 22.5oC?</p><p>8. Calculate the number of joules released when 75.0 grams of water are cooled from 100.0oC to 27.5oC.</p><p>9. Calculate the heat, in joules, needed to warm 225 grams of water from 88.0oC to its boiling point, 100.0oC.</p><p>10. The specific heat of gold is 0.128 J/gCo. How much heat would be needed to warm 250.0 grams of gold from 25.0C to 100.0C?</p><p>11. Write the abbreviated electron configurations of the following elements:  iridium ______ chlorine ______ nobelium ______ cesium ______ magnesium ______12. The following electron configurations belong to which elements:  1s22s22p63s1 ______ 1s22s22p63s23p64s23d104p65s24d6 ______ [Kr] 5s24d10 ______ [Xe] 6s24f145d106p2 ______ [Rn] 7s25f146d4 ______</p><p>13. Calculate the frequency of light with wavelength = 2.50 x 10-7m.</p><p>14. What is the energy of cell phone radiation with a 1.0 m wavelength?</p><p>15. What is the energy (Joules) of Violet light with a frequency = 7.50 x 1014 s-1.</p><p>16. One student performed an experiment in which nitrogen and hydrogen gas were mixed together to form ammonia. Equilibrium concentrations of the three species were [NH3] = 0.157 M, [N2] = 0.921 M and [H2] = 0.763 M. </p><p>1N2 + 3H2 → 2NH3</p><p> What is the equilibrium expression for this reaction?</p><p> Calculate the value of the equilibrium constant</p><p>17. Sodium-24 has a half-life of 15 hours. How much sodium-24 will remain in an 18.0 g sample after 60 hours?</p><p>18. After 42 days a 2.0 g sample of phosphorus-32 contains only 0.25 g of the isotope. What is the half-life of phosphorus-32?</p><p>19. Polonium-214 has a relatively short half-life of 164 seconds. How many seconds would it take for 8.0 g of this isotope to decay to 0.25 g?</p>