Chem. 1A Midterm 1 Version A Practice Test 2
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1 Chem. 1A Midterm 1 Version A Practice Test 2 Name Student Number All work must be shown on the exam for partial credit. Points will be taken off for incorrect or no units. Calculators are allowed. Cell phones may not be used for calculators. On short answer problems you must show your work in order to receive credit for the problem. If your cell phone oes off durin the exam you will have your exam removed from you. Fundamentals (of 24 possible) Problem 1 (of 8 possible) Problem 2 (of 16 possible) Problem (of 16 possible) Problem 4 (of 12 possible) Multiple Choice (of 24 possible) Midterm Total (of 100 possible) 1
2 Fundamental Questions Each of these fundamental chemistry questions is worth points. You must show work to et credit, if applicable. Little to no partial credit will be rewarded. Make sure to report answers in the correct number of sinificant fiures and indicate the proper units. 1) pts How many kilorams are in 251 m? 1 1k 251m k or k 1000m ) pts What ionic compound is formed between a) calcium and bromine and b) potassium and oxyen? CaBr 2 K 2 O ) pts Balance the followin equations? a) MnO 2 (s)+ HCl(aq) Cl 2 (aq)+ MnCl 2 (aq)+ H 2 O(l) b) BCl ()+ H 2 O(l) B(OH) (aq)+ HCl(aq) MnO 2 (s) + 4HCl(aq) Cl 2 (aq) + MnCl 2 (aq) + 2H 2 O(l) BCl () + H 2 O(l) B(OH) (aq) + HCl(aq) 4) pts What are the names of the followin elements: Mo, M, and Sn? Mo = ybdenum, M = manesium, and Sn = tin 5) pts What are the names of the followin compounds: a) SF 6 and b) AlF? SF 6 = sulfure hexaflouride AlF = aluminum flouride 6) pts How many es of Cu are in.20? 1Cu.20Cu Cu 6.55Cu 7) pts How many protons, neutrons, and electrons does a) neon-22 and b) Bi have? neon protons, 10 electrons, and 12 neutrons 209 Bi 8 protons, 80 electrons, and 126 neutrons 8) pts How many widets are in es? N nn a widets 2
3 Short Answer Questions Each of the followin short answer questions are worth the noted points. Partial credit will be ive. You must show your work to et credit. Make sure to report answers in the correct number of sinificant fiures and indicate the proper units. 1) 8 pts An iron bar weihed 664. After the bar had been standin in moist air for a month, exactly one-eihth of the iron turned to rust (Fe 2 O ). Calculate the final mass of the iron bar and rust. Calculate the mass of Fe that when into formin Fe 2 O Calculate the mass of rust formed Fe Fe 2 O Fe Fe Fe 2 O Fe 2 O M M Fe Fe O Fe 1Fe2O Fe2O 8.0Fe Fe Fe Fe2O Calculate the mass of the bar remainin Calculate the mass of the bar and the rust ) A solid compound x contains 6.% Mn and 6.7% O by mass. When X is heated, oxyen as is evolved and a new solid compound Y containin 72.0% Mn and and 28.0% O is formed 2a) 6 pts Determine the empirical formula of X. Assume X weihs 100 Moles of Mn M Mn 1H 6.Mn 1. 15Mn 54.94H Moles of O M O 1O 2 6.7O 2. 29O 16.00O 2 Divide throuh by smallest number of es (1.15 ) Mn O Empirical Formula MnO 2 Question 2 Continues on Pae 4
4 2b) 6 pts Determine the empirical formula of Y. Assume Y weihs 100 Moles of Mn 1H 72.0Mn 1. 1Mn 54.94H Moles of O 1O O 1. 75O 16.00O 2 Divide throuh by smallest number of es (1.1 ) Mn O Multiple throuh by to et whole numbers Empirical Formula Mn O 4 2c) 4 pts Write a balanced equation for the conversion of X to Y MnO 2 (s) Mn O 4 (s) + O 2 () ) DDT, an insecticide harmful to fish, birds, and humans, is produced by the followin reaction: 2C 6 H 5 Cl(l) + C 2 HOCl (l) C 14 H 9 Cl 5 (l) + H 2 O(l) C 6 H 5 Cl chlorobenzene, C 2 HOCl chloral, and C 14 H 9 Cl 5 DDT In a overnment lab, 1142 of chlorobenzene is reacted with 485 of chloral. a) 7 pts What is the mass of DDT formed? M C H Cl , M chloral , and M DDT Amount of C 6 H 5 Cl and C 2 HOCl present at the beinnin of r eaction. 1C H Cl C6H5Cl C6H5Cl C6H5Cl 1C2HOCl 485C2HOCl. 29C2HOCl 147.8C2HOCl Moles of C 2 HOCl needed to fully react es of C 6 H 5 Cl 1C2HOCl 10.15C6H5Cl C2HOCl 2C6H5Cl Since we only have.29 C 2 HOCl, it is our limitin reaent Calculate the mass of DDT formed from.29 of HOCl 1DDT 54.48DDT.29C2HOCl DDT 1C2HOCl 1DDT Question Continues on Pae 5 4
5 b) 1 pts Which reactant is limitin? Which is in excess? The limitin reaent is C 2 HOCl and C 6 H 5 Cl is present in excess. c) 4 pts What mass of the excess reactant is left over? Amount of C 6 H 5 Cl used 2C H Cl C H Cl C2HOCl 741C6H 1C HOCl 2 1C6H 6Cl d) 4 pts If the actual yield of DDT is 200.0, what is the percent yield? actual yield % yield 100% 100% 17.1% 1170 theoretical yield Cl 4) Convert the followin into balanced equations 4a) 4 pts When allium metal is heated in oxyen as, it melts and forms solid allium(iii) oxide. 4Ga(l) + O 2 () 2Ga 2 O (s) 4b) 4 pts When solutions of calcium chloride and sodium phosphate are mixed, solid calcium phosphate forms and sodium chloride remains in solution. CaCl 2 (aq) + 2Na PO 4 (aq) Ca (PO 4 ) 2 (s) + 6NaCl(aq) 4c) 4 pts When crystalline potassium chlorate is heated to just above its meltin point, it reacts to form two different crystalline compounds, potassium chloride and potassium perchlorate. 4KClO (s) KCl(s) + KClO 4 (s) 5
6 Multiple Choice Questions Each of the followin multiple choicee questions are worth 4 points. Your answers need to be filled in on the Scantron provided. Note: Your Scantrons will not be returned to you,, therefore, for your records, you may want to mark your answers on this sheet. On the Scantron you need to filll in your perm number, testt version, and name. Failure to do any of these thins will result in the loss of 1 point. Your perm number is placed and bubbled in under the ID number. Do not skip boxes or put in a hyphen. In addition, leave bubbles blank under any unused boxes. The version number (A) is bubbled in under the test form. 1. Compound X 2 Y is 60% X by mass. Calculate the percent Y by masss of the compound X 2 Y 2. A) 50% B) 20% C) 0% D) 40% E) None of the above. 2. Which of the followin is not the correct chemical formula for the compound named? A) All of the formulas are correct. B) Fe 2 O iron(iii) oxide C) PBr5 phosphorus pentabromidee D) CoO cobalt(ii) oxide E) CaSO calcium sulfite O 4. For a new element, 67.16% is an isotope with mass amu, 2.76% is an isotope with mass 28.7 amu, and 0.08% is an isotope with mass amu. Calculate the averae atomic masss of this new element. A) amu B) amu C) amu D) 1.4 amu E) None of the above. 4. What is the correct formula for chromium(vi) oxide? A) CrO B) Cr 2 O C) Cr 6 O D) CrO6 E) None of the above. 6
7 5. Consider the followin balanced equation: A() + 5B() C() + 4D(s) When equal masses of A and B are reacted, which is limitin? A) If the ar mass of A is less than the ar mass of B, then B must be limitin. B) More information is needed. C) If the ar mass of A is reater than the ar mass of B, then A must be limitin. D) If the ar mass of A is less than the ar mass of B, then A must be limitin. E) If the ar mass of A is reater than the ar mass of B, then B must be limitin. 6. How many of the followin chemical formulas are written incorrectly? ClNa BaBr 2 LaF 2 ClRb A) All are written incorrectly. B) One is written incorrectly. C) Two are written incorrectly. D) All are written correctly. E) Three are written incorrectly. 7
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