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1 Name: Lab Day and Time: Instructions 1. Do not open the exam until you are told to start. 2. This exam is closed note and closed book. You are not allowed to use any outside material while taking this exam. 3. Use the spaces provided to write down your answers. To receive full credit, you must show all work. Do not write answers on any other pieces of paper. If you need more room, write on the back of the exam and be sure to include a note describing where the work is located. 4. When solving numerical problems, make sure you include the proper units in your final answer. 5. If a question asks for a response in sentence or paragraph form, make sure you respond in that format. 6. Useful data for the exam and a periodic table are provided on the last page of the exam. Carefully tear out these sheets if you wish. Page # Points possible Points awarded Attendance 4 EC(from lecture) 1 Total 100 1

2 Multiple Choice Unless otherwise directed, choose the single best answer for each question. Please use the space provided to do your calculations. Make sure your answers have the proper number of significant figures. Most questions in the multiple choice section are worth 3 points, but one question also has two additional points for showing the work. 1. Express x10 5 in the proper form of scientific notation. a. 1.2x10 5 d. 1.20x10 8 b. 1.2x10 8 c. 1.2x According to our discussion in class, what is the simplest building block of matter? a. molecule d. electron b. proton e. atom c. isomer 3. What is the mass (in µg) of Kr(gas) occupied by a 234 ml sample of Kr(gas)? The density of Kr(gas) is g/l. a. 6.27x10 4 µg c. 8.74x10 5 µg b. 8.74x10-1 µg d. 6.27x10-8 µg 4. The SI unit for mass is. a. g b. lb c. m d. kg 2

3 5. Convert 89.3 ng to kg. a. 8.93x10-11 kg b. 8.93x10-8 kg c. 8.93x10 7 kg d. 8.93x10 10 kg 6. The output of a German precision ball bearing plant is x10 6 g of ball bearings per 5.00 days. If each ball bearing has a mass of g, how many ball bearings does the plant make in 1.00 days? In addition to the three multiple choice points, I will aslo grade the work of this problem. The work will be worth two points. In order to earn the two points you must get the answer correct and also show the work using one line dimensional analysis. a. 3.84x10 5 ball bearings b. 7.67x10 4 ball bearings c. 867 ball bearings d. 3.48x10 7 ball bearings 7. How many significant figures are in the measurement below? cm a. 2 d. 5 b. 3 c. 4 3

4 8. A sample of matter has a mass of g and a volume of ml. If you had a 12.2 g sample of the same matter, what volume would it occupy? a ml b ml c ml d. 115 ml 9. How many significant figures should be in the answer to the calculation shown below? x x10? a. 1 b. 2 c. 3 d. 4 e particles have no specific shape, move relatively fast, and have intermediate particleparticle attractive forces. a. Solid b. Liquid c. Gas d. None of the above. 4

5 11. According to our discussion in class, we use the scientific method to help us study/understand chemistry. What is the first step when using the scientific method? a. Generate a hypothesis. b. Develop a theory. c. Make an observation. d. Perform an experiment. 12. How many significant figures should be in the answer to the calculation shown below? a. 1 d. 4 b. 2 e. 5 c. 3 Use the diagrams below to answer the following three questions about a sample of matter. Assume that the black and grey balls represent different elements and that if they are touching each other they are connected/bonded to each other. Also assume that each box represents a different physical state. A B 13. The matter in box A would best be classified as a. a. pure element d. heterogeneous mixture b. pure compound e. both a pure element and a pure compound c. homogeneous mixture 14. During the transition from box A to box B, what happened to the kinetic energy of the particles? a. It increased. b. It decreased. c. It remained constant. 5

6 15. Of the following, the smallest and lightest subatomic particle is the. a. neutron d. nucleus b. proton e. alpha particle c. electron 16. Which of the following compounds is/are ionic compounds? I. H 2 SO 4 IV. IF 5 II. FeO V. MgBr 2 III. PtCl 3 a. I, II, III, IV d. II, III, V b. I, II, III, V c. II, III, IV, V 17. Which of the following elements is an alkaline earth metal? a. Sc b. Cu c. Fe d. Na e. None of the above is an alkaline earth metal. 18. The scientist whose alpha-particle scattering experiment led him to conclude that the nucleus of an atom contains a dense center of positive charge is. a. J.J. Thomson b. Lord Kelvin c. William Thomson d. Ernest Rutherford e. James Chadwick 19. This problem is extra credit. What is the temperature indicated by the linear scale shown to the left? (2 points) 6

7 20. Fill in the missing information into the table. (10 points) Element Name Element Symbol Os Fluorine Ni Iron Mg 21. For the following questions, fill in the blank with a word, phrase, or number that best completes the sentence. Put your answer in the column on the right. (9 points) a. The formula for the ionic compound formed from aluminum and sulfur is. b. A measurement was reported to be m. The absolute uncertainty associated with this measurement is. c. The elemental notation for a 3+ ion that contains 23 electrons and 30 neutrons is. 22. On the left hand side of the arrow below, draw a picture of the calcium (Ca) atom. Assume the calcium atom has 25 neutrons. On the right hand side of the arrow, draw a picture of the ion that calcium forms. In your diagrams, include the location and number of the protons, neutrons, and electrons. Label the nucleus and make sure the relative sizes of the atom and ion are accurate. Under the ion, state whether it is a cation or anion. (6 points) 7

8 23. a.) A friend of yours wants to make a bid on ebay for an 8.98x10-8 mile 3 sample of Pepsi. However, the units of volume are weird and your friend is having difficulty converting it to something that makes sense. So, they asked for your help. What is that volume in liters? You must use one line dimensional analysis as we did in class to receive full credit. (6 points) b.) Is this a volume that can easily be stored at their house? (1 point) 24. In an experiment, I determined the area of a card by measuring its length and width. I measured the length of the card to be cm and the width to be 7.94 cm. If the true area of the card is cm 2, determine the absolute error (a.e.) and the percent relative error (% r.e.) of my calculated area. You must show all your work and use a in any intermediate values. For all of the calculations, show unrounded and rounded answers, with a box around your rounded values. (8 points) Area Area = Length x Width a.e. = A-X % r.e. = a.e. 100% A A = True Value X = My Value a.e. % r.e. 8

9 Conversion Factors, Constants, and Periodic Table 1 m = yards 1 inch = 2.54 centimeters (exact) 12 inches = 1 foot (exact) 1 gallon = liters 1 mile = kilometers 1 pound = grams 1 ton = 2000 pounds (exact) 1 H Li Na K Rb Cs Fr (223) 4 Be Mg Ca Sr Ba Ra Sc Y La Ac Ti Zr Hf Rf (261) 23 V Nb Ta Db (262) 24 Cr Mo W Sg (263) 25 Mn Tc (98) 75 Re Bh (262) 26 Fe Ru Os Hs (265) 27 Co Rh Ir Mt (266) 28 Ni Pd Pt Ds (269) 29 Cu Ag Au Rg (272) 30 Zn Cd Hg Cn (277) 5 B Al Ga In Tl Uut 6 C Si Ge Sn Pb Fl (289) 7 N P As Sb Bi Uup 8 O S Se Te Po (209) 116 Lv (293) 9 F Cl Br I At (210) 117 Uus 2 He Ne Ar Kr Xe Rn (222) 118 Uuo 58 Ce Th Pr Pa Nd U Pm (145) 93 Np (237) 62 Sm Pu (244) 63 Eu Am (243) 64 Gd Cm (247) 65 Tb Bk (247) 66 Dy Cf (251) 67 Ho Es (252) 68 Er Fm (257) 69 Tm Md (258) 70 Yb No (259) 71 Lu Lr (260) 9

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