941_1 st Exam_941020 1) Which of the following does not represent a physical property? A) boiling point B) odor C) density D) reaction with oxygen E) solubility in water 2) Which of the following is not an example of matter? A) wood B) water C) air D) light E) atoms 3) Which formula could not be that of an alkane? A) CH 4 B) C 3 H 8 C) C 6 H 10 D) C 8 H 18 E) C 10 H 22 4) Select the proper systematic name for the following compound: A) 2-ethylbutane B) 3-ethylbutane C) 3-methylpentane D) 3-methylhexane E) isohexane 5) When the following equation is balanced with lowest ratio whole number coefficients, the coefficient of CaO is CaO + P 4 O 10 Ca 3 (PO 4 ) 2
A) 3 B) 4 C) 5 D) 6 E) 7 6) When 0.340 mol butane, C 4 H 10, is burned with excess oxygen, how many moles of oxygen are consumed? 2 C 4 H 10 (g) + 13 O 2 (g) 8 CO 2 (g) + 10 H 2 O (l) A) 0.340 B) 0.0523 C) 13.0 D) 2.21 E) 6.50 7) Which of the following is the correct formula for iron (III) oxide? A) Fe 3 O B) FeO 3 C) F(OH) 3 D) Fe 2 O 3 E) Fe 3 O 2 8) How many μg are in 0.0158 g? A) 1.58 10-4 B) 1.58 10-6 C) 1.58 D) 1.58 10 6 E) 1.58 10 4 Answer: E 9) Convert 184 F to degrees Celsius. A) 84 C B) 274 C C) 120 C D) 75 C E) 66 C 10) How many liters are there in a cubic centimeter?
A) 10 6 B) 10 3 C) 10 3 D) 10 6 E) 10 9 11) Which of the following compounds is molecular? A) Fe 2 O 3 B) NaOH C) NF 3 D) CuCl 2 E) CdS 12) Which substance is incorrectly labeled? A) Na 2 SO 4 10H 2 O a hydrate B) H 3 PO 4 an acid C) KOH a base D) PF 3 a salt E) C 3 H 8 O 3 an organic compound 13) The empirical formula of the reduced form of lactobionic acid, a sugar used in some medicinal agents, is CH 2 O. The molecular mass of this compound is 360. What is the molecular formula? A) CH 2 O B) C 360 H 720 O 360 C) C 19 H 4 O 8 D) C 12 H 24 O 12 E) C 16 H 24 O 9 14) What is the mass percent composition of carbon in a 0.100 g sample of a carbon-hydrogen-oxygen compound? The compound, when combusted in oxygen, provided 0.220 g CO 2 and 0.239 g water. A) 80.6 B) 4.16 C) 45.5 D) 8.76 E) 60.0 Answer: E 15) When the following equation is balanced with lowest ratio whole number coefficients, the coefficient of CO 2 is
C 4 H 10 (g) + O 2 (g) CO 2 (g) + H 2 O (1) A) 4 B) 5 C) 6 D) 7 E) 8. Answer: E 16) Which of the following physical quantities is not a base unit of the SI? A) mass B) length C) volume D) time E) temperature 17) What is the number of significant figures in the answer to 242.0 g 42.00 g? A) 1 B) 2 C) 3 D) 4 E) 5 18) Which measurement is expressed using 3 significant figures? A) 0.0232 kg B) 34.20 cm C) 68.003 g D) 10,550 m E) 222.0 km 19) Which of the following is a metal? A) P B) Se C) Sr D) S E) Si 20) Which of the following is a metalloid?
A) S B) Ga C) Sn D) In E) Sb Answer: E 21) Perform the indicated operations and express the answer in cm with the proper number of significant figures. 28.1 cm + 0.53 cm + 75.321 cm =? A) 104.0 B) 103.95 C) 103.951 D) 104 E) none of these 22) A 600. ml container has what volume in fluid ounces? (1 L = 1.06 qt) (1 qt = 32 fl. oz.) A) 18.1 B) 0.0199 C) 20.4 D) 0.0177 E) 33.7 23) What mass of nitrogen, in grams, is present in 148 g ammonium sulfate, (NH 4 ) 2 SO 4? A) 28.0 B) 25.0 C) 15.7 D) 31.4 E) 45.8 24) What mass, in grams, of phosphorus is present in 55.2 g of ammonium phosphate ((NH 4 ) 3 PO 4 )? A) 55.2 B) 11.5 C) 149 D) 15.1 E) 20.9
25) Which of the following could be an empirical formula? A) C 2 H 6 B) C 6 H 12 O 6 C) C 3 H 8 D) C 2 H 2 Cl 2 E) C 60 H 60 26) Which statement is incorrect? A) 238 U contains 146 neutrons B) 60 Zn has the same number of protons and neutrons C) 50 Mn has the same number of electrons and neutrons D) 41 K has the same number of protons and electrons E) 18 O has the same number of protons and neutrons Answer: E 27) The ratio of atomic mass of element A to that of B is 0.432. If the mass of A is 42.31 what is the mass of B? A) 18.3 B) 42.7 C) 97.9 D) 105 E) none of these 28) Typically, the mass of an atom of an element, in grams, is closest to A) 10 32. B) 10 22. C) 10 10. D) 1. E) 10 23. 29) Convert 55 miles per hour to meters per second. (1 mi = 5280 ft; 1 m = 39.37 in.) A) 25 B) 88 C) 2.4 10 2 D) 3300 E) 42 30) An experiment calls for 22.6 g of bromine (d = 3.12 g/ml). What volume, in ml, should be used?
A) 70.5 B) 7.24 C) 0.138 D) 22.6 E) none of these 31) Calculate the mass, in grams, of a sample containing 1.85 10 34 molecules of water. A) 3.07 10 10 B) 5.53 10 11 C) 188 D) 8.46 10 3 E) none of these 32) Calculate the number of molecules in 2.86 g CO 2. A) 6.48 10 15 B) 1.30 10 22 C) 3.91 10 22 D) 1.17 10 23 E) 9.26 10 24 33) Calculate the number of atoms in 48.0 g glucose, C 6 H 12 O 6 A) 2.26 10 22 B) 1.60 10 23 C) 3.85 10 24 D) 1.64 10 16 E) 9.24 10 25 34) Calculate the mass percent of nitrogen in HNO 2. A) 29.8 B) 68.1 C) 45.2 D) 70.2 E) 25.0 35) What is the mass number of an isotope of mercury that has 122 neutrons? A) 122 B) 200 C) 202
D) 80 E) 120 36) An atom containing 34 protons, 43 neutrons, and 34 electrons would have the symbol: A) 77 Se B) 77 Ir C) 77 Tc D) 43 Se E) 43 Tc 37) How many neutrons are in an atom of 18 O? A) 18 B) 16 C) 8 D) 10 E) 7 38) Naturally occurring chlorine consists of the two isotopes: chlorine-35 and chlorine-37. The atomic mass for chlorine is approximately 35.5. What are reasonable estimates of the relative percentages of chlorine-35 and chlorine-37, respectively? A) 50, 50 B) 25, 75 C) 75, 25 D) 33, 67 E) 67, 33 39) Which pair of symbols below represents isotopes? A) 16 O, 16 N B) 16 O, 17 O C) H, He D) He, He + E) 13 C, 14 N 40) The density of gold is 19.3 g/ cm 3. A 3.4 mg piece of gold is hammered into a square that is 8.6 10 6 cm thick. What is the length of a side of the square, in cm? A) 0.020 B) 87 C) 4.5
D) 143 E) 39 41) If 33.1 g of a metal occupies a volume of 4.55 ml, what is the density of the metal, in g/ml? A) 7.27 B) 0.137 C) 1.37 10 4 D) 4.54 E) 18.6 42) A reaction requires 17.6 g of chloroform (CHCl 3, d = 1.446 g/ml). What volume, in ml, should be used? A) 17.6 B) 25.4 C) 12.2 D) 19.0 E) 0.0822 43) Taken by itself, the fact that 8.0 g of oxygen and 1.0 g of hydrogen combine to give 9.0 g of water demonstrates what natural law? A) Conservation of Mass B) Constant Composition C) Multiple proportions D) The Atomic Theory E) Periodicity 44) Wherever it is found, water always contains oxygen and hydrogen in the mass ratio of 8 to 1. Taken by itself, this fact demonstrates what natural law? A) Conservation of Mass B) Constant Composition C) Multiple proportions D) The Atomic Theory E) Periodicity 45) The ratio of the mass of oxygen that combines with 1.0 g of hydrogen in water to the mass of oxygen that combines with 1.0 g of hydrogen in hydrogen peroxide is 1:2. Taken by itself, this fact demonstrates what natural law? A) Conservation of Mass
B) Constant Composition C) Multiple proportions D) The Atomic Theory E) Periodicity 46) Calculate to five significant figures, the formula mass of the compound (NH 4 ) 2 SO 4 A) 132.14 B) 114.10 C) 132.00 D) 114.11 E) 66.138 47) Calculate the number of moles of CO present in a 125 g sample of the gas. A) 2.84 B) 4.46 C) 2.12 D) 8.93 E) 0.224 48) How many F ions are present in 2.50 moles of BF 2? A) 5.00 B) 3.01 10 24 C) 1.51 10 24 D) 2.50 E) 6.02 10 24 49) Calculate the mass, in grams, of 7.35 mol water. A) 10.7 B) 0.408 C) 25.4 D) 132 E) 18.0 50) How many Cl ions are present in 50.0 g FeCl 3? A) 1.41 B) 1.85 10 23 C) 5.57 10 23 D) 3.01 10 25
E) 150