Exam 1 - Fall 2011

Exam 1 - Fall 2011 - ohemms Exam I — fall 20| I x u}.-...

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Unformatted text preview: ohemms Exam I — fall 20| I x u}.- aw“ Name W Sectlon 435%? All multiple choice questions. There is only one correct answer for each question. A total of 34 questions - Q #1 to 33 are 3 points each; q #34 is worth 1 point. Sept. I5. 20” 1. The horizontal rows of the periodic table are commonly called (a) inert gases b) halogens c) families d) groups @periods 2. The correct scientific notation with the correct number of significant figures for 7 0.00250 L is a) 2.50 x10'2 b) 2.5 x10’1 c) 2.50 x103 d) 2.5 x 10‘3 @250 x10'3 3. The state of matter for an object that has definite volume and shape is a) mixture b) pure 0) liquid (1) gas @ solid 4. A boxer registers 49.9 kg when he steps on a scale. When converted to lbs, his weight is equal to [ Given: 1 kg = 2.206 lbs] a) 202 b) 155 (6} 110 d) 185 e) 125 5. After measuring the length of an object three times, the following values were obtained : 54.23 cm, 54.25 cm , 54.22 cm. The accepted (true value) of the object is 54.23 cm. Which of the following best describes the data a) precise b) accurate @both (a) and (b) d) precise but not accurate e) meaningless, not enough information 6. The largest pizza baked weighed 26,883 lbs. When rounded to two significant figures, it becomes a) 26000 @27000 c) 27 d) 26800 e) 26880 7. The most abundant element found in the earth’s crust is I a) calcium b) water 0) oxygen ron e) silicon 8. Perform the following temperature conversion: -18 0F to °C _ a) 27 °C b) 42 °C 0) —50 °C —28 0C e) 106 °C 9. According to Newton, “for every action, there is an equal and opposite reaction”. This statement is considered to be a) a hypothesis @a law c) an experiment d) a theory e) none of the above 10. The label on a soft drink indicates that it has a volume of 355 mL. What is this volume in pints? [ 1 qt = 2 pints; 1 L = 1.0567 qt] a) 0.38 pints b) 2.57 pints @075 pints d) 1.25 pints e) 1.50 pints 11. An example of a homogeneous mixture among the following is a) dirt b) silicon c) pizza d) magnesium sulfate bronze ' 3 v Essa ; 5 .52; 5 12. The density of ethyl alcohol is 6.60 lb/ gal. When converted to kg/L, the density value becomes [1kg = 2.206 lb; 3.785 L =1 gal] a) 1.11 kg/L b) 2.21 kg/L c) 0.098 kg/L {@3079 kg/L e ) 9.28 kg/L 13. The one that describes a chemical change/property among the following is @allowing milk to sour b) making a pitcher of Kool Aid c) tearing paper ) breaking glass e) washing clothes with detergent 14 When written in standard decimal form, 1.56 x10‘3 , becomes a) 1.56 b) 0.000156 c) 156 d) 1560 @000156 15. How many of the following is/are mixture/s: bronze, salsa, dian'énd, white wine, winfikfiiv glass, distilled water, so ' m a)1 * b)2 c)3 @4 e)0 16. The correct answer with proper number of significant figures for : 9.2 x 10.65 ; is 3.3. (8.39 + 4.009) “we a) 15.7 @79 c) 7.90 d) 7.91 e) 7.97 17. The scientist/philosopher c dited for developing modern chemical symbols a) Mendeleev b) RWd 0) Thomson d) Berzelius @omecritus 18. Without doing the calculation, determine the uncertainty in the answer 234.1 + 0.087 + 58 is a) :b 10 b)i0.1 c) 2: 0.001 ((9 :1 e) :: 0.01 19. Which of the following equipments is used for determining the mass of a liquid? a) graduated cylinder b) calorimeter @balance d) barometer e) hydrometer 20. A sample containing 33.42 g of metal pellets is poured into a graduated cylinder initially containing 25.4 mL of water causing the water level in the cylinder to rise to 34.3 mL. What is the density of the metal? a) 1.32 g/mL b) 0.97 g/mL (9’? 3.8 g/mL d) 1.03 g/mL e) 0.76 g/mL 21. The number of protons (p), neutrons (n) and electrons (e) that are present in an atom of I. vanadium—51 (51V) isotope e 3p, 28n, 23e b) 23p%23e c) 51W23e d) 23 , 3n, 28e e) 23 , 3n,51e 22. Perform the following conversion: 11 inches to millimeters (mm) [ 1 in = 2.54 cm;] a) 305 mm b) 30.5 mm c) 4.33 mm d) 4.0 mm @279 mm 23. An male astronaut weighs 180 1b on earth. What would his mass in kg be if he landed on the surface of the moon? (gravitational pull of the moon is 0.17 confirm to earth; 1 kg = 2.206 lbs) 21) 54.4 kg b) 81.6 kg c) 397 kg 139 kg 6) 306 kg ’3’"? GT?” . 51.5 7 1/ A, ‘ {A x‘ 9" ii 3‘93 =9” "a: Egfi" i5?” [ 2p {Weagwk a P 2 fifiiflhfl 5 L t w» Ls» é I (a? 24. A backpacker carries 1.2 L of fuel for her portable stove. How many pounds (lb) does the fuel add to her load? [density of the fuel = 0.73 g/mL; 1 kg = 2206 lb]. a) 2.206 lbs b) 7.3 lbs c) 3.83 lbs @193 lbs e) 8.33 lbs 25. ucleon is a collective of two particles, namely eutrons and protons b) protons and electrons c) neutrons and electrons d) neutrons and ions e) (a) and (c) 26. The atomic symbol ( A X) for isotope that has 28 neutrons and 24 protons is SZN' ‘ 52 52 77 24 a) 28 1 @MCr c) 28Cr d) 34Se e) 52Te 27. Type of matter that can be separated by chemical but not by physical means is a/an @compound b) mixture c) liquid d) solid e) element 28. Pure zinc has a density of 7.14 g/mL. What is the volume of 6.3 g of pure zinc? r “v @ 1.13 mL b) 13.4 mL c) 1.82 mL (1) 0.88 mL e) 2.87 mL ‘? 29. Which of the following statements is consistent with Dalton’s atomic theory? a) atoms of oxygen and chlorine are identical @all atoms of sulfur are identical c) atoms of nitrogen and oxygen combine to form only one compound, N20. d) an atom of an element is divisible e) all of the above 30. [Given: atomic number = Z; mass number = A] Isotopes are defined as elements that have @same A but different Z b) same Z but different A 0) same A but different type of atoms d) different Z e) mass as sum of A and Z 31. The Greek prefix, centi for the metric system indicates of a unit @ 10'2 b) 10'6 c) 101 d) 106 e) 10'3 [453.6g =1 lb; 16 oz =1 lb] a) 14.9 oz b) 4.02 02 c) 11.4 oz , d) 0.54 oz @857 oz 33. The correct description of the microscopic entity/ies shown in the diagram is. [EPA gaseous compound b) a mixture of twogéseous elements 0) a solid/element d) a mixture of gaseous element and a gaseous compound e) none of theébove 34 ( 1 point) One of the authors of your book is a) Malone b) Bauer @umdahl d) Tro e) Timberlake ...
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Exam 1 - Fall 2011 - ohemms Exam I — fall 20| I x u}.-...

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