Chemistry 11 Spring 2012 (practice exam) Examination #1

Transcription

1 Chemistry 11 Spring 2012 (practice exam) Examination #1 This exam has 20 multiple choice questions each worth 2 points. The free response section includes: Naming and formula (see old exams to prepare for these. The more you practice, the more you will know the answers to these questions.) 10 questions worth 2 points each. Fill in the blanks: worth 12 points. Lewis structures: 4 questions each worth 7 points. Refer to previous exams 1. What do you mean by: A. Covalent bond B. Ionic Bond C. Valence electrons and Valence shell D. Evaporation, condensation, deposition, sublimation E. Atomic #, mass # F. Isotopes G. Orbital H. Metalloid 2. Streptomycin was the first antibiotic remedy for tuberculosis. Based on your knowledge of VSEPR, which of the following geometries is NOT present in streptomycin? A. trigonal planar 1

2 B. tetrahedral C. bent D. trigonal pyramidal E. All of the above are present in streptomycin 3. Select A for True OR B for False regarding the following statement: Streptomycin does not possess any resonance. 4. Select A for True OR B for False regarding the following statement: Streptomycin is a slightly polar molecule although predominantly nonpolar. 5. Convert 335 K to Fahrenheit. A F B. 62 F C. 144 F D. 170 F E F 6. Two students, Jack and Lisa, determined the mass of an object on two different balances. The accepted mass of the object was g. Jack obtained values of g, g, g and g. Lisa obtained values of g, g, g and g. Which statement best describes the results that were obtained by Jack and Lisa? A. Jack obtained the better accuracy B. Lisa obtained the better accuracy C. Jack obtained the better precision. D. Both A and C are correct E. Both B and C are correct 7. Two student determined the density of their aluminum cylinder to be g/ml. What is the % error of their measurement, if the actual density of aluminum is g/ml? A % B % C % D % E % 8. What is the mass number for potassium that has 20 neutrons and 18 electrons? 2

3 A. 37 B. 19 C. 38 D. 39 E Determine the expected electronic configuration for Te -2 : A. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4d 10 4p 6 5s 2 5d 10 5p 6 B. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4d 10 4p 6 5s 2 5d 10 5p 4 C. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 D. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 2 E. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s A 55.9 kg person displaces 57.2 L of water when submerged in a water tank. What is the density of the person in g/cm 3? A kg/ L B g/cm 3 C g/cm 3 D. cannot be determined as the original volume of water in the tank is not given E. cannot express volume in cm The specific heat of iron is 0.11 cal /g. C. What will be the initial temperature if 275 calories are added to a 75.0 g piece of iron whose final temperature is 58 C? A. 25ºC B ºC C. 91 ºC D. 57 ºC E. 20 ºC 12. Express x 10-4 as an ordinary decimal number. 13. How much heat must you add to 18.8 ml of a liquid to increase its temperature from 10.0 ºC to 40.0 ºC? The density of the liquid is g/ml and the specific heat of the liquid is cal/g. ºC. 14. Write in scientific notation. 15. Compute to the correct # of significant figures: x (7.823 x x 10 3 ) 3

4 16. Which are the transition elements that do not need roman numerals after their names and why? 17. A physician recommends adding 100. mg of morphine to 500. cc of IV fluid and administering at a rate of 20. cc/h to alleviate a patient's pain. Determine how many grams per second (g/s) the patient is receiving. 18. The recommended pediatric dosage of Velosef is 20. mg/kg/day. (A) What is the daily dose (in mg) for a child weighing 36 pounds? (B) If the stock vial of Velosef is labeled 208 mg/ml, how many ml would be given in a daily dose? 19. A patient weighs 186 lbs. She must receive an IV medication based on body weight. The order reads, "Give 2.0 mg per kilogram". The label reads "10. mg per cc". How many ml of medication would you give? 20. A critical care physician prescribes an IV of heparin to be administered at a rate of 1100 units per hour. The IV contains 26,000 units of heparin per liter. Determine the rate of the IV in cc/h. 21. For Questions 1 5, use the generically labeled periodic table below to select the best answer choice for each of the listed descriptions: 1. These group of elements are difficult to extract from their natural sources and separate from one another. 2. Elements within this category require Roman numerals in parentheses to indicate their oxidation states. 3. Elements in this group can be malleable, shiny, and simultaneously poor conductors of heat and electricity. 4

5 4. This group of elements features completely filled orbitals and are very unreactive. 5. This group of elements can be solids, liquids, and gases at room temperature. 6. Most likely to undergo oxidation. Answers to practice test 1 2. E 3. A 4. B 5. C 6. E 7. D 8. D 9. C 10. C 11. A cal x x Ag, Cd, Zn because they always exist as Ag +, Zn 2+, Cd x 10-6 g/s 18. A. 3.3 x 10 2 mg/day B. 1.6 ml ml cc/h 21. 1) AB (lanthanides) 2) B. Transition metals 3). C. metalloids 4). Noble gases 5). D. Halogens 6). A Alkali and alkaline earth metals. 5