CHEMISTRY FALL 2017 SEMESTER EXAM STUDY GUIDE Answers
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CHEMISTRY FALL 2017 –SEMESTER EXAM STUDY GUIDE Answers
1. FLAMMABLE MATERIALS, LIKE ALCOHOL, SHOULD NEVER BE DISPENSED OR USEDN EAR a) b) c) d) an open door. an open flame. another student. a sink. B.
2. IF A LABORATORY FIRE ERUPTS, IMMEDIATELY a) b) c) d) notify your instructor. run for the fire extinguisher. throw water on the fire. open the windows. A.
3. APPROVED EYE PROTECTION DEVICES (SUCH AS GOGGLES) ARE WORN IN THEL ABORATORY a) b) c) d) to avoid eye strain. to improve your vision. only if you don’t have corrective glasses. any time chemicals, heat or glassware used. D.
4. IF YOU WEAR CONTACT LENSES IN THE SCHOOL LABORATORY, a) b) c) d) take them out before starting the lab. you do not have to wear protective goggles. advise your science instructor that you wear contact lenses. keep the information to yourself. C.
5. IF YOU DO NOT UNDERSTAND A DIRECTION OR PART OF A LAB PROCEDURE, YOU SHOULD a) b) c) d) figure it out as you do the lab. try several methods until something works. ask the instructor before proceeding. skip it and go on to the next part. C.
6. AFTER COMPLETING AN EXPERIMENT, ALL CHEMICAL WASTES SHOULD BE a) b) c) d) left at your lab station for the next class. disposed of according to your instructor’s directions. dumped in the sink. taken home. B.
7. IF A LAB EXPERIMENT IS NOT COMPLETED, YOU SHOULD a) b) c) d) discuss the issue with your instructor. sneak in after school and work alone. come in during lunch and finish while eating lunch. make up some results. A.
8. YOU ARE HEATING A SUBSTANCE IN A TEST TUBE. ALWAYS POINT THE OPEN END OF THETUBE a) b) c) d) toward yourself. toward your lab partner. toward another classmate. away from all people. D.
9. YOU ARE HEATING A PIECE OF GLASS AND NOW WANT TO PICK IT UP. YOU SHOULD a) b) c) d) use a rag or paper towels. pick up the end that looks cooler. use tongs. pour cold water on it. C.
10. YOU HAVE BEEN INJURED IN THE LABORATORY (CUT, BURN, ETC. ). FIRST YOU SHOULD a) b) c) d) visit the school nurse after class. see a doctor after school. tell the science instructor at once. apply first aid yourself. C.
11. WHEN GATHERING GLASSWARE AND EQUIPMENT FOR AN EXPERIMENT, YOU SHOULD a) b) c) d) read all directions carefully to know what equipment is necessary. examine all glassware to check for chips or cracks. clean any glassware that appears dirty. All of the above. D.
12. YOU WANT TO PLACE A PIECE OF GLASS TUBING INTO A RUBBER STOPPER AFTER THE TUBING HAS BEEN FIRE POLISHED AND COOLED. THIS IS BEST DONE BY a) b) c) d) lubricating the tubing with water or glycerin. using a towel or cotton gloves for protection. twisting the tubing and stopper carefully. all of the above. D.
13. PERSONAL EYEGLASSES PROVIDE AS MUCH PROTECTION AS a) b) c) d) a face shield. safety glasses. splash-proof chemical goggles. none of the above. B. or D.
14. LONG HAIR IN THE LABORATORY MUST BE a) b) c) d) cut short. held away from the experiment with one hand. always neatly groomed. tied back or kept entirely out of the way with a hair band, hairpins, or other confining device. D.
15. IN A LABORATORY, THE FOLLOWING SHOULD NOT BE WORN. a) b) c) d) loose clothing. dangling jewelry. sandals. all of the above. D.
16. THE FOLLOWING FOOTWEAR IS BEST IN THE LABORATORY. a) b) c) d) sandals open-toed shoes closed-toed shoes appropriate for the weather C.
17. HORSEPLAY OR PRACTICAL JOKES IN THE LABORATORY ARE a) b) c) d) always against the rules. okay. not dangerous. okay if you are working alone. A.
18. IF A PIECE OF EQUIPMENT IS NOT WORKING PROPERLY, STOP, TURN IT OFF, AND TELL a) b) c) d) the custodian. your lab partner. your best friend in the class. the science instructor. D.
19. IF AN ACID IS SPLASHED ON YOUR SKIN, WASH AT ONCE WITH a) b) c) d) soap. oil. weak base. plenty of water. D.
20. WHEN YOU FINISH WORKING WITH CHEMICALS, BIOLOGICAL SPECIMENS, AND OTHER LAB SUBSTANCES, ALWAYS a) b) c) d) treat your hands with skin lotion. wash your hands thoroughly with soap and water. wipe your hands on a towel. wipe your hands on your clothes. B.
21. I Error 22. B Precision 23. J 1 liter 24. G Temperature 25. F Density 26. C Specific gravity 27. E Volume 28. A Weight 29. D 1 kilogram 30. H Accuracy
31. HOW MANY SIGNIFICANT FIGURES ARE IN THE MEASUREMENT 2103. 2 G? a) b) c) d) 2 3 4 5 D.
32. HOW MANY OF THE ZEROS IN THE MEASUREMENT 0. 000 040 200 M ARE SIGNIFICANT? a) b) c) d) 2 3 7 8 B.
33. THE CLOSENESS OF A MEASUREMENT TO ITS TRUE VALUE IS A MEASURE OF ITS: a) b) c) d) usefulness. precision. accuracy. reproducibility. C.
34. WHICH OF THESE MEASUREMENTS IS EXPRESSED TO THREE SIGNIFICANT FIGURES? a) b) c) d) 0. 070 mm 7. 30 x 10 -7 km 7007 0. 007 B.
35. WHAT IS THE VOLUME OF 60. 0 G OF ETHER IF THE DENSITY OF ETHER IS 0. 70 G/L? M a) b) c) d) 86 m. L 1. 2 x 10 -2 m. L 2. 4 x 10 -2 m. L 42 m. L A.
36. THE TEMPERATURE READING OF -14 ˚ C CORRESPONDS TO A KELVIN READING OF: a) b) c) d) 297. 6 K -287 K 259 K D.
37. CHLORINE BOILS AT 239 K. WHAT IS THE BOILING POINT OF CHLORINE EXPRESSED IN DEGREESC ELSIUS? a) b) c) d) 93 ˚C 34 ˚C -61 ˚C -34 ˚C D.
38. A STUDENT MEASURES A VOLUME OF 25 L, M WHEREAS THE CORRECT VOLUME IS 23 M L. WHAT IS THE PERCENT ERROR? a) b) c) d) 0. 087 % 8. 7 % 0. 92 % 8. 0 % B.
39. D Temperature 40. C Celsius scale 41. A Kelvin scale 42. B Absolute zero 43. E SI
44. ROUND OFF THE FOLLOWING MEASUREMENTS TO TWO SIGNIFICANT FIGURES. 0. 0828 m a) 0. 083 m b) 19. 75 ˚C a) 20. ˚C a)
45. A BLOCK OF SILVER-COLORED METAL WITH A VOLUME 3 HAS A MASS OF 750. 0 G. THE DENSITY OF OF 65. 0 CM 3. IS THE METAL PURE SILVER? PURE SILVER IS 10. 5 G/CM D = m V D = 750. 0 g 65. 0 cm 3 D = 11. 5 g/cm 3 This is NOT pure silver!
46. PERFORM THE FOLLOWING OPERATIONS. MAKE SURE THAT YOUR ANSWERS HAVE THE CORRECT NUMBER OF SIGNIFICANT DIGITS. a) 4. 15 cm x 1. 8 cm a) b) 36. 47 cm + 2. 721 cm + 15. 1 cm a) c) 54. 3 cm 148. 576 g – 35. 41 g a) d) 7. 5 cm 2 113. 17 g (8. 74 x 109 m) ÷ (4. 2 x 10 -6 s) a) 2. 1 x 1015 m/s
47. J proton 52. E isotopes 48. G atom 53. D atomic number 49. A mass number 54. B atomic mass 50. C atomic mass unit 55. H nonmetals 51. F electron 56. I neutron
57. THE SUM OF THE PROTONS AND NEUTRONS IN AN ATOM EQUALS THE: a) b) c) d) atomic number of electrons. atomic mass number. D.
58. THE NUCLEUS OF AN ATOM IS: a) b) c) d) negatively charged and has a low density. negatively charged and has a high density. positively charged and has a low density. positively charged and has a high density. D.
59. ALL ATOMS OF THE SAME ELEMENT HAVE THE SAME: a) b) c) d) number of protons. number of neutrons. mass number. mass. A.
60. AN ATOM COMPOSED OF 16 PROTONS, 16 ELECTRONS, AND 16 NEUTRONS IS a) b) c) d) Sulfur-48 Germanium-32 Sulfur-16 C.
61. AN ATOM OF AN ELEMENT WITH ATOMIC NUMBER 48 AND MASS NUMBER OF 120 CONTAINS: a) b) c) d) 48 protons, 48 electrons, and 72 neutrons 72 protons, 48 electrons, and 48 neutrons 120 protons, 48 electrons, and 72 neutrons 72 protons, 72 electrons, and 48 neutrons A.
62. THE NUMBER 80 IN THE NAME BROMINE-80 REPRESENTS: a) b) c) d) the atomic number. the mass number. the sum of protons and electrons. none of these. B.
63. RELATIVE ATOMIC MASSES ARE MEASURED IN: a) b) c) d) nanograms. angstroms. amus. D.
64. THE PERIODIC LAW STATES THAT: a) b) c) d) When the elements are arranged in order of increasing atomic mass, there is a periodic repetition of their physical and chemical properties. Elements with similar chemical properties have the same atomic number. When the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties. The properties of the elements within a period are the same as you move across the period from left to right. C.
65. WHICH ELEMENT IS NOT A TRANSITION METAL? a) b) c) d) Aluminum Silver Iron Zirconium A.
66. COMPLETE THIS TABLE. Atomic Number Mass Number of Protons Number of Neutrons Number of Electrons 9 19 9 10 9 7 14 7 7 7 20 41 20 21 20 13 27 13 14 13 26 56 26 30 26
67. E periodic table 68. G periods 69. A group 70. F representative elements 71. C alkali metals 72. D transition metals 73. H halogens 74. B noble gases
75. E Democritus 76. C Dalton 77. F Thomson 78. B Millikan 79. D Chadwick 80. A Rutherford
81. WHAT TYPE OF IONS HAVE NAMES ENDING IN IDE? a) b) c) d) Cation Anion Metallic Both A and B B.
82. WHAT IS THE ELECTRICAL CHARGE OF A CATION? a) b) c) d) Positive Negative Neutral None of the above A.
83. IONS FORM WHEN ATOMS GAIN OR LOSE __. a) b) c) d) Protons Neutrons Electrons None of the above C.
84. WHICH OF THE FOLLOWING FORMULAS REPRESENTS AN IONIC COMPOUND? a) b) c) d) N 2 O 4 CO Fe 2 O 3 Xe. Cl 4 C.
85. WHICH OF THE FOLLOWING FORMULAS REPRESENTS A MOLECULAR COMPOUND? a) b) c) d) N 2 O Li. NO 3 Ca. CO 3 NH 4 NO 3 A.
86. TERNARY IONIC COMPOUNDS CONTAIN THREE DIFFERENT _____. a) b) c) d) Elements Acids Cations Charges A.
87. WHAT ARE THE COMPONENTS OF BINARY MOLECULAR COMPOUNDS? a) b) c) d) two oppositely-charged ions two polyatomic ions two nonmetallic elements two metallic elements C.
88. NAME THE FOLLOWING POLYATOMIC IONS. a) Cl. Oa) b) SO 42 a) c) hypochlorite sulfate H 3 O + a) hydronium
89. GIVE THE SYMBOLS FOR THE FOLLOWING POLYATOMIC IONS (DON’T FORGET TO WRITE THE CHARGE). a) Sulfite a) b) SO 32 Cyanide a) CN 1
90. NAME THE FOLLOWING IONIC COMPOUNDS. a) Na 2 SO 4 a) b) Sodium sulfate KCl a) Potassium chloride
91. GIVE THE FORMULA FOR THE FOLLOWING IONIC COMPOUNDS. a) Calcium Hydroxide a) b) Ca(OH)2 Nickel (III) Bromide a) Ni. Br 3
92. NAME THE FOLLOWING MOLECULAR COMPOUNDS. a) NO 2 a) b) Nitrogen dioxide CCl 4 a) Carbon tetrachloride
93. WRITE FORMULAS FOR EACH OF THE FOLLOWING BINARY MOLECULAR COMPOUNDS. a) carbon hexabromide a) b) CBr 6 silicon dioxide a) Si. O 2
94. NAME THE FOLLOWING ACIDS. a) HBr a) b) Hydrobromic acid H 2 SO 3 a) Sulfurous acid
95. GIVE THE FORMULA FOR EACH OF THE FOLLOWING ACIDS. a) hydronitric acid a) b) H 3 N nitric acid a) HNO 3
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