# CHEM& 161 PLACEMENT EXAM PREPARATION PROBLEMS

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1 CHEM& 161 PLACEMENT EXAM PREPARATION PROBLEMS CHEM& 161 is a course that requires prerequisite knowledge in math and chemistry. The purpose of the placement exam is to ensure that you are entering at a level that will allow you to succeed in CHEM& 161 and beyond. You will be provided a periodic table (similar to the one on the last page). You are permitted to use a calculator, but you must bring one to use. No cell phones will be allowed. These problems reflect the nature of the exam in terms of content, but the exam will be multiple choice (whereas the problems below are not). The level of difficulty of these problems are similar to those on the placement exam. For the purposes of practicing, do this exam twice. You should first use it as a guide for studying and reviewing material. Show all of your work and check it using the answer key. Then wait a sufficient period (so as not to remember the answers) and do these problems in exam mode no help, 60 minutes timed, no interruptions. Grade your exam and see where you need to review. 1. Calculate: Without a calculator, determine: log(1000) =? Convert 62 µm into Mm and express as scientific notation. 3. x 2 3.4x = 0. Solve for x. 4. Solve for n 1 given the following expression: x 1 y 1 n 1 m 1 = x 2y 2 n 2 m 2 5. Convert 16.5 miles per gallon into km per liter. 1km = miles 1 gallon = liters 6. Convert 2.15x10-4 L into rundlets. 1 cm 3 = 1.47x10-5 rundlets. 7. Given the following data points, sketch a graph that presents the data. Draw a best fit line and determine the slope and y-intercept for the graph. Then write the equation of the line. x y

2 8. Report the following measurement with the appropriate number of significant figures. 9. I have 3.4 moles of Mg(CN) 2. How many total moles of carbon atoms do I have? 10. Balance the following reaction: C 8 H 18 (l) + O 2 (g) ---> CO 2 (g) + H 2 O(l) 11. The density of gold is 19.1 g/cm 3. What is the mass of 16 liters of solid gold? 12. How many electrons are found in one mole of the ion F -? 13. How many protons are in the radioisotope Iodine-131? 14. Name me: SiO What is the ground state electron configuration of sodium? 16. What is the volume of a sphere, with a radius of 43 pm? 17. How much, in total, do 15 atoms of iron weigh, in grams? 18. I have 14 grams of solid magnesium chloride. How many moles of chlorine atoms are contained in this solid? grams of natural gas burns in the presence of excess oxygen. How much CO 2 (g) will be produced as a result of this burning? The balanced chemical equation is given below: CH 4 (g) + 2O 2 (g) ---> CO 2 (g) + 2H 2 O(l)

3 20. A substance X has a mass of 2.50 pounds and a volume of mm 3. What is its density in g/cm 3? (453.6 grams = 1 lb) 21. What is the volume (ml) of ethanol required for a mass of 7.55x10-1 kg? The density of ethanol is g/ml at 25 C What is the number of (a) protons, (b) neutrons, and (c) electrons in 30Zn 2+? 23. How many molecules of water are present in 1 pound (453.6 g) of water? 24. How many moles of methane (CH 4 ) are required to produce 18 moles of H 2 O based on the following balanced chemical equation for its combustion? CH 4 (g) + 2O 2 (g) ---> CO 2 (g) + 2H 2 O(l) 25. What is the correct chemical formula for an ionic compound that contains only calcium ions (Ca 2+ ) and nitrate ions (NO 3 - )? 26. How many milligrams is 4x10-6 kg? 27. A Toyota Prius has a fuel tank that can hold about 11.9 gallons. How many liters is this? (1 liter = gallons) 28. The temperature of a nice warm day in Europe is 30 C. What is this temperature in F? 29. What is the symbol for an ion with 8 protons, 10 neutrons, and 10 electrons? Use A/Z notation (see #23). 30. An unknown isotope, X, has the symbol X. What element is X? 31. What is the chemical formula for lead (II) phosphate?

4 32. If I have grams of Na 2 CO 3, how many moles of Na 2 CO 3 is this? 33. Balance the following chemical equation: AgNO 3 (aq) + CuCl 2 (aq) ---> Cu(NO 3 ) 2 (aq) + AgCl (s) 34. What is the average atomic mass of two hypothetical isotopes with the following isotopic masses and natural abundances: isotope 1 ( amu, 36.34%) and isotope 2 ( amu, 63.66%) 35. Draw an acceptable Lewis structure for the following molecular (covalent) compounds, including all lone pairs. (a) water, H 2 O (b) ammonia, NH 3 (c) carbon dioxide, CO 2 (d) cyanide ion, CN How many moles of nitric acid (HNO 3 ) is obtained from ml of a 3.00 M solution of HNO 3? 37. Convert 4.5 x 10 3 in 3 into cm 3. (1.00 in = 2.54 cm) 38. You have a cylinder with a volume of 750 ml that is 30. cm in height. What is the diameter of its base in cm? (1 ml = 1 cm 3 ) 39. A medical doctor gives the order to administer dopamine at a rate of 3.0 mcg / kg min (mcg is the abbreviation for microgram in a medical context). The dopamine is supplied as a mixture of 400. mg dopamine in 250. ml of a dopamine solution. The patient weighs 73 kg. What is the infusion rate of the dopamine into her body (in units of ml/hour)?

5 Periodic Table of the Elements 1A 8A 1 1 H A 3A 4A 5A 6A 7A 2 He Li Be B C N O F Ne Na Mg B 4B 5B 6B 7B 8B 1B 2B 13 Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc (98) 44 Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb B i Po (210) 85 At (210) 86 Rn (222) 7 87 Fr (223) 88 Ra (226) 89 Ac** (227) 104 Rf (261) 105 Db (262) 106 Sg (263) 107 Bh (262) 108 Hs (265) 109 Mt (266) 110 Und (269) 111 Une (272) 112 Unn (277) *Lanthanides 58 Ce Pr Nd Pm (147) 62 Sm Eu Gd Tb Dy Ho Er Tm Yb Lu **Actinides 90 Th Pa (231) 92 U Np (237) 94 Pu (242) 95 Am (243) 96 Cm (247) 97 Bk (247) 98 Cf (249) 99 Es (254) 100 Fm (253) 101 Md (256) 102 No (254) 103 Lw (257)

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