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UCSB CHEM 1A - Exam 1A v2

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1 Chem. 1A Exam I Test Form A First letter of your last name: Oct. 21, 2013 Name Perm # Last Name First Name There are a total of six pages (23 questions) on the exam. Each question is worth 3, 4 or 6 points. Show all your work on the exam and circle the answers. You will keep the exam so you can check your answers. The answers to the exam will be posted on Gauchospace. SCANTRON FORM: Completely fill bubbles 1) Write your name Completely fill answers 2) Bubble in FORM A 3) Bubble in your PERM number (7 digits only, no extra numbers) INFORMATION PAGE: Remove the information page. No other notes or books are allowed. INSTRUCTIONS: No hats or hoods allowed. No sharing of calculators. Cell Phones, iPods, headsets, and any other electronic devices must be turned off and put away. It is to your benefit to show your work. Circle your answers! ANSWERS are given at the end of the exam. Questions 1 – 4: (3 pts each) Indicate if the compound in an aqueous solution is a non-electrolyte, weak electrolyte or strong electrolyte. 1. NaCl A) non-electrolyte B) weak electrolyte C) strong electrolyte 2. tap water A) non-electrolyte B) weak electrolyte C) strong electrolyte 3. NaOH A) non-electrolyte B) weak electrolyte C) strong electrolyte 4. CH3OH A) non-electrolyte B) weak electrolyte C) strong electrolyte Questions 5 – 10: (4 pts each) For each chemical formula given indicate if the name is correct or incorrect. 5. H2CO3 hydrogen carbonate A) correct B) incorrect 6. Fe2(SO4)3 iron(III) sulfate A) correct B) incorrect 7. N2O nitrogen dioxide A) correct B) incorrect 8. Mg3N2 magnesium nitride A) correct B) incorrect 9. Cu3(PO4)2 copper (III) phosphate A) correct B) incorrect 10. K2O2 potassium oxide A) correct B) incorrect2 Questions 11 – 14: (4 pts each) Indicate true or false. 11. 188O and 199F have the same number of neutrons. A) true B) false 12. 146C and 147N are isotopes of each other. A) true B) false 13. 3216S and 3216S2– are isotopes of each other. A) true B) false 14. 35Cl−, 40Ar, and 39K+ have the same number of electrons. A) true B) false 15. (6 pts) What is the percent by mass of hydrogen in ammonium acetate? A) 5.23% B) 3.92% C) 9.15% D) 14.3% E) 7.07% 16. (6 pts) When the equation below is balanced with the smallest set of integers, what is the sum of the coefficients? NH3 + O2  NO + H2O A) 4 B) 12 C) 14 D) 19 E) 24 17. (6 pts) Consider the following reaction: 2AlBr3 + 3Cl2  2AlCl3 + 3Br2 When 2.5 moles of aluminum bromide reacts with 3.0 moles of chlorine, how many moles aluminum chloride will be formed? Assume that the reaction goes to completion and that it occurs at room temperature and pressure. A) 2.5 moles B) 2.0 moles C) 1.0 moles D) 3.0 moles E) 5.5 moles3 18. (6 pts) A 4.000-g sample of the metal nitrate M(NO3)2 was dissolved in water and treated with excess aqueous sodium sulfate. The sulfate salt that formed weighed 3.318 g. Determine the identity of the metal. A) Pb B) Ba See assigned problem #47 text (7th edition) #39 (6th edition) C) Ca D) Sr E) Mg 19. (6 pts) Magnesium metal reacts with hydrochloric acid to form aqueous magnesium chloride and hydrogen gas. When 3.65 g of magnesium is added to 50.0 mL of 3.00 M hydrochloric acid, what mass of hydrogen is produced, assuming the reaction goes to completion? A) 0.123 g B) 0.151 g C) 0.246 g D) 0.302 g E) none of these4 20. (6 pts) A solution is made by mixing 40.0 mL of 4.00 M NaCl with 20.0 mL of 5.00 M CaCl2. When 30.0 mL of this solution is added to 80.0 mL of water, what is the resulting chloride ion concentration? A) 2.25 M B) 1.64 M C) 1.18 M D) 1.23 M E) 1.90 M5 21. (6 pts) Suppose 1.83 g of KCl is dissolved in 150.0 mL of 0.045 M AgNO3. Calculate the final molarity of chloride ions in the solution. You can assume that the volume of the solution does not change when the potassium chloride is dissolved in it and the reaction goes to completion. A) 0.15 M B) 0.018 M From Objective 3 (Ch. 4) ALEKS C) 0.16 M D) 0.12 M E) 0.045 M One more question One more question6 22. (6 pts) You find a compound composed only of element X and hydrogen, and you know that it is 91.27% element X by mass. Each molecule has 2.67 times as many H atoms as X atoms. What is element X? A) C B) Ne C) Si D) Cl E) Cu ANSWERS: 1. C 2. B 3. C 4. A 5. B 6. A 7. B 8. A 9. B 10. B 11. A 12. B 13. B 14. A 15. C 16. D 17. B 18. C 19. B 20. B 21. D 22. C No Partial


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