Exam 1 - Feburary,8 2006 Chem 105 Exam 1 Name N 5"...

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Unformatted text preview: Feburary,8, 2006. Chem 105 Exam 1 Name N 5"»: axe. . Please be clear with your final answer. 100 points Multiple Choice Questions — put your answer choice in the space provided. . . E 1) The key to success in chemistry is: A) curiosity. B) mathematical skills. C) commitment. D) practice. E) all of the above ‘ 2) Which statement about the scientific method is TRUE? C’ A) The scientific method emphasizes reason as the way to understand the world. B) The scientific method emphasizes observation and reason as the way to ' understand the world. C) The scientific method emphasizes observation and experimentation as the way to understand the world. D) The scientific method emphasizes scientific laws as the way to understand the world. E) All of the above statements are false. C/ 3) All of the following statements about different elements are true EXCEPT: A) Barium is an alkaline earth metal. B) Manganese is a transition metal. C) Sulfur is considered a metalloid. D) Krypton is one of the noble gases. E) Iodine is a halogen. C 4) Which of the following is not a correct name, symbol combination? A) beryllium, Be B) magnesium, Mg C) iron, I D) manganese, Mn E) silicon, Si 5) Which of the following statements about ions is INCORRECT? A) Cations are positive ions and anions are negative ions. B) Cations are formed when an atom loses electrons. C) Anions are formed when an atom gains electrons. D) Cations are formed when an atom gains protons. B) All statements are correct. 6) Isotopes are: A) atoms of the same element that have different number of neutrons. B) atoms of the same element that have different number of protons. C) atoms of the same element that have different number of electrons. D) atoms of the same element that have the same number of neutrons. E) none of the above 7) When elements combine to form compounds, A) their properties are an average of all elements in the compound. B) their properties change completely. C) their properties do not change. D) their properties are completely random. E) none of the above 8) The oxygen—to-hydrogen mass ratio of water is always 8.0 is an example of what fundamental law? A A) Law of Constant Composition B) Law of Constant Mass Ratio C) Law of Conservation of Mass D) Law of Constant Whole Number Ratio E) none of the above 9) Which of the following is a molecular compound? . ' A) barium sulfide * b B) calcium acetate C) potassium hydroxide D) nitrogen monoxide E) none of the above A) Magnesium nitrite: Mg(N02)3 B) Calcium carbonate: CaCO3 C) Aluminum sulfate: (NH4)2804 D) Sodium hydrogen carbonate: NaHCO3 E) Potassium hydroxide: KOH 10) Choose the pair of names and formulas that do not match. A 2::— 11) The formula for potassium chlorate is KClO3. The formula for magnesium chloride is MgClz. What is the formula for magnesium chlorate? ' A '0 A) MgClO3 B) Mg2ClO3 C) Mg(CIO3)2 D) Mg2(ClO3)3 E) none of the above 12) What would the formula of diiodine pentasulfide be? A) 1552 B) 1285 C) 1459 D) 1287 E) none of the above 13) What is the name of HNOz? _B>__ A) Nitric acid B) Nitrous acid C) hydronitrous acid D) hydronitric acid E) none of the above D 14) Which of the following sets of units is not in the order of increasing size? A) lug < g < kg B) mL < dL < L C) ns < ms < s D) cm < pm < km E) umol < mmol < mol 15) What is the value of 11°C on the Fahrenheit scale? 'A) 52 B) 59 C) 73 D) 81 E) none of the above . . . 3 3 D 16) How many microliters (11L) are in 41.0 mL? ( 10 uL = lmL = 1 cm ) A) 4.1 x 103 B) 4.1 x 1010 C) 0.041 D) 4.10 x 104 E) none of the above 17) How many joules are there in a 255 calorie snack bar? _' - C A) 2.55 x 105 B) 1.07 x 106 C) 1.07x 103 D) 6.09 x 104 E) none of the above 18) A 15.0 gram lead ball at 250°C was heated with 40.5 joules of heat. Given the specific heat of lead is 0.128 J/g-'°C, what is the final temperature of the lead? P) A) 21.1°C ' ‘ - B) 46.1°C C) 778°C D) 0.844°C E) none of the above 19) Given the table of specific heat values below, what is the identity of a 26.2 g metal sample that increases by 8.5°C when 100.0 J of energy is absorbed? Element Specific Heatg J/gOC) Au 0.128 Ag 0.235 Cu 0.385 Fe 0.449 A1 0.903 . A) Fe 7 , A , B) Al - C) Au D) Ag E) none of the above 20) Chlorine has two stable isotopes, Cl—35 with a natural abundance of 75.95% and Cl— 37 with a natural abundance of 24.05%. If their exact masses are 34.9689 amu and 36.9695 amu, respectively, what is the atomic mass of chlorine in amu A) 35.15 amu _ Q— B) 34.45 amu C) 35.45 amu D) 35.00 amu E) 37.00 amu ...
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Exam 1 - Feburary,8 2006 Chem 105 Exam 1 Name N 5"...

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