Chm 17 practice exam, Cheat Sheet of Chemistry

Download Chm 17 practice exam and more Cheat Sheet Chemistry in PDF only on Docsity! SECTION NUMBER __ Bronx Community College Dept. of Chemistry CHM 17 FINAL. Last four digits of SSN: INSTRUCTOR’S NAME: READ THIS FIRST INSTRUCTIONS: L. os - Part I has 8 questions. Ye This exam packet consists of tw 0 parts: Part I and Part H. Part Ihas 50 multiple choice questions for 50 points. must complete 5 of the 8 questions for 50 points. Each © sure to read each carefully. question has several parts. Complete one additional question in Part I for 10 bonus points and a possible total score of 110 points. Write the word “OMIT” on the questions you do not answer. If you answer more than 6 questions, only the first 6 will be considered. At the top of this sheet, print your Full Name, last 4 digits of your Social Security Number (SSN), Section Number and Instructor's Name. . On the Scantron answer sheet. print your Last Name and First Name. For the Subject enter CHM 17 followed by the letter of the Exam version you have been given Include your Section Number. Use the answer sheet for Part 1 of the Exam. ; On the Exam Booklet, print Your Name, CHM 17, followed by the letter of the Exam version and your Section Number. The exam booklet is to be used for scrap only. - Record your answers to Part Ton the computerized answer sheet. You must use a pencil to mark your answers and fill in the spaces completely. Write your answers to Part I directly in this question packet. You May use pen or pencil. Show all work for full credit. Include: setups, correct number of significant figures and units. - When you are finished taking the exam, submit the computerized answer sheet, the exam booklet and this exam packet to one of the proctors. Page 3 Part I (50 points) |. The number 0.004197, w hen rounded off to 3 s enificant figures, wou (a) (0.00420 b) id042 c) 0.00421 “0.00400 Ls d \ Id appear as In which of the following pairs of numbers does each member of the p, nificant figures? 20.02 and 462 b) 71.0 and 81.00 0.0806 and 965,000 d) 0.03070 and 0.0670 air contain the same number of iy The "mathematical Meaning" associated with the metric system prefixes centi, micro and nano is, vespectively 10-2, 10-4, and 10-6 b)10-L, 10-3, and 10-6 10-3, 10-9, and 19-12 (A) 10, 10-6, and 10-9 In which one of the following measuifed)numbers are al/ of the Zeros significant? 0.70480 b) 0.30120 c) 6. 1 d) 99,400 When a substance undergoes a c, it changes color heat is absorbed ca! change it is alw ays true that b}it changes state ® a 6. Object A w cighs 20 grams and has a volume of 5 mL. Object B weighs 12 Therefore, Aa a) Bis twice as dense as A. (0) Afnd B have equal densities c) Bis four times as dense as A Ais dense than B. op chemical composition changes is lons have a positive or negative charge because AL all subatomic particles lose their charges once they enter an atom Q unequal numbers of protons and electrons are present c) the number of subatomic particles j d) all atoms contain protons the nucleus is alw ays an odd number Pos. An atom contains are, respectively, 4) 25 and 55 b) 30 and 65 c) 25 and 30 lectrons. The ato + mass number for this atom d) 30 and 55 Isotopes of a given element a) have the same mass number but different chemical properties b) have the Same atomic number but different al properties c) have the same mass number but different numbers of protons ANY b- > fferent ge 4, o. rs Of 3 ave different mass numbers but identical numbers of protons on for phosphorus ( 1sP) is b) Is2 d) Is2 © ll. How many unpaired electrons are Present in the orbital diagram for an at 24.2 3p4 0 2 2, 3p / } 2 a) 0 b) 1 c)2 d)3 om Whose electron configuration is  Page 6 35. In which of the following liquids would intermolecular force? a) HCI b) HSe c)N 36. The ment of oxidation numbers to the elemen a) +8 for S and 6 for O c) +4 for § and -3 for O ts in the polyatomic ion SO4 * would be b) +6 forS and 2 forO d) +8 for S and -2 for O 37. What is the change in oxidation number for iron in the following redox reaction? FeO +CO > Fe +CO> a)72to0 b) +2 to +1 )-3 to 0 Ina redox he substance a) contai element which decreases in oxidation number 5) never contains oxygen c) is also the reducing agent d) always gains electrons —39. The minimum en called the y that reactant particles must possess order fo Orientation energy © b) activation ene c) catalytic en d) colli __ 41. Inan Ay enius acid-base definition, the con respectively a(n) pounds KOH, HNO,. and H,CO,. when dissolved in water, are base, acid and acid acid, base and acid 42. Which of th © following is € avid base pair? a) NH NH3—b) HEF c) H20 OF d) H2CO3 CO3 _ 43 In which of the fo a) H3PO4 and H2CO3 c) H2SO4 and HCI wing pairs of acids are both members of the pair ¥ b) EHINO3 and HBr d) HCO3 and HCI “acids? _. 44. Which of the following reactions is a non-1 a) CaCO; > Cad = CO: 5) SO: + F20 > ELSO; ce) 2Cu0 Cut Oz d) 2KCIO; > 2K lox decompo on reaction? 43. Which of the fol owing hydrogen ton (or hydronium ion) concentrations ( {H7]) would produce an acidic solution? a) 1.00 x 10-7 M b) 1.00 x 19-1E M c) 1.00 x 10-13 M d) 1.90 < 19-2 M  _46. A solution witha PH of 13.0 is a) weakly acidic b) strongly basic c) strongly acidic d) weakly basic 47. The pH of a solution with hydrogen ion concentration (H*] = 1.0.x 10-3 is a) 4.0 b) 11.0 ©) 3.0 §) -3.0 48. Which of the follow ing is the best definition for the term radionuclide? a) the nucleus of any atom b) a nucleus that is stable c) anucleus with more than 35 neutrons d) a nucleus that is unstable 49. Which of the following types of radiation is composed of particles with a positive charge? a) alpha particles b) beta particles c) gamma radiation < 50. Which of the following would have the most penetrating power into matter? a) alpha particles b) beta particles ¢) gamma radiation d) protons ac ~ Part II (50 points) You must answer any five (5) of the following 8 ques question for 10 points extra credit if you answer more than 6 questio: [Show all work for full credit, in: space: . Mark the two questions you do not w ms, only the first 6 will be considered, clude: setups, and correct number of significant figures and units.] & iven below. Do a sixth ant graded with the word OMIT. L. a) [5 pts] Calculate the percent mass-volume (% mv) c in 400. mI. of solution? entration of a solution containing 30.0 g of NaCl dissolved b) [5 pts] Cal ate the molarity (M = moles/L) of an 800. mL solutior containing 50.0 g of NaOH. 2. a) [5 pts} Calculate the yolume in liters (L) occupied by 63.0 grar pressure and 127°C? (R= 0.08211 -atm/moles-K) s (N2) at 1.37 atmospheres (atm) of b) [5 pts] If ample of nitrogen gas (N3) t determine the volume in liters ata ten @ pressure of 3.70 atm and a temperature of 47°C, yperature of 244°C anda of 3.60 atm