Chem119-Exam1-practice-noanswers

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FALL 2023 BARONDEAU CHEMISTRY 119 Practice exam Name (Print): _________________________________ Name (Signature):_____________________________ Student ID:_____________________________ Instructions: You can remove the formula page/periodic table on the last page from the exam. The exam must be completed during the class period and the answers written neatly in the boxes provided next to the problems for grading.

1. What is the symbol for the following elements (3 points each)? a. iron b. potassium c. gold 2. Indicate the number of protons and electrons for the Co 3+ ion (4 points)? 3. Write the symbol for an ion with 56 protons and 54 electrons (4 points). 4. A radioactive isotope of sulfur (S) contains 19 neutrons. What is its mass number (4 points)? 5. The n = ______ shell is the lowest that can contain f-orbitals (4 points; place answer in box). a. 2 b. 3 c. 4 d. 5 e. 6 Protons = Electrons =

6. What is the wavelength of a photon of red light that has a frequency of 4.58  10 14 s -1 (4 points)? 7. What would be the energy associated with the red light (frequency of 4.58  10 14 s -1 ) from problem 6 in kJ/mol (4 points)? 8. The Pauli exclusion principle states that (4 points; place answer in box) a. no two electrons in an atom can have the same four quantum numbers. b. electrons can have either ±1/2 spins. c. electrons with opposing spins are attracted to each other. d. no two electrons in an atom can have the same spin. e. two electrons occupying the same orbital must have identical spins.

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9. According to the photoelectric effect, which of the following will increase the kinetic energy of an electron ejected from a metal surface (4 points; place answer in box)? 1. decreasing the wavelength of the light striking the surface 2. decreasing the frequency of the light striking the surface 3. increasing the number of photons of light striking the surface a. 1 only b. 2 only c. 3 only d. 2 and 3 e. 1 and 3 10. Which of the following transitions in a hydrogen atom would emit the highest energy photon (4 points; place answer in box)? a. n = 4 to n = 2 b. n = 1 to n = 5 c. n = 6 to n = 5 d. n = 5 to n = 1 e. n = 3 to n = 6 11. Which orbital is represented in the figure below (4 points)?

12. Write a set of four quantum numbers to describe a 3d electron in a nickel atom (note: there are multiple correct answers; 4 points). 13. How many atoms are there in 2.33 g of gold (Au) metal (4 points)? 14. What mass is required to have 2.26 moles of the 63 Cu isotope (4 points)? 15. How many significant figures are in the number 0.0002040150 (4 points)? n = l = m l = m s =

16. A hypothesis is a (4 points) a. mathematical formula that models a pattern of behavior b. well-tested, unified principle that explains a body of facts c. set of experiments designed to test a theory d. a tentative explanation or prediction based on experimental observations e. a concise statement of a behavior that is always the same under the same conditions 17. If the temperature was reported as 25.8 ° C, what would the temperature be in Kelvin (3 points)? 18. If 5.34 g of Al 2 (SO 4 ) 3 (molar mass 342.15 g/mol) is dissolved in just enough water to make exactly 250.0 mL of solution, what is the molar concentration of sulfate ions (4 points)? Report the answer with 3 significant figures. 19. What volume of a 4.00 M HCl stock solution must be diluted to make 175.0 mL of a 0.450 M HCl solution (4 points) (report the answer with 3 significant figures)?

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20. In an aqueous solution, the species that is often said to dissolved in the solution is called the ____________ (3 points)? 21. What would be the molar mass of the following compound Na 3 PO 4 (4 points)? 22. A proton would have a larger de Broglie wavelength than an electron (True or False; 3 points). 23. Convert 55.2 g/cm 3 into kg/m 3 units (include 3 significant answers; 4 points). 24. Which of the following elements would you expect to have the most similar chemical properties to Ca? (4 points) a. K b. Sc c. Mg d. Na e. Cl

25. You do an experiment to determine the density of a block of lead. You determine the density to be 11.89 g/mL. The accepted value is 11.33 g/mL. What is the percent error (4 points; report with 3 significant figures)?

Equations and constants that might be useful c =  E = h  E= mc 2 E n = - Rhc / n 2 (energy for level n of hydrogen atom)  E = -Rhc (1/n 2 final – 1/n 2 initial ) (energy for transition between energy levels)  E = -N A Rhc (1/n 2 final – 1/n 2 initial ) (energy for mol of transitions between energy levels) 1/  = R (1/n 2 final – 1/n 2 initial)  = h / mv (de Broglie equation) c = 2.998  10 8 m/s Plank’s constant = h = 6.626  10 -34 J s Avogadro’s number = N A = 6.022  10 23 mol -1 R (Rydberg constant) = 1.097  10 7 m -1 K =  C + 273.15  C = (F-32)  (5/9) 1 J = 1 kg m 2 s -2 1 mL = 1 cm 3 M = moles/L M 1 V 1 = M 2 V 2

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