Gen Chem 1 Final Exam Review – Saylor Questions and Answers

Gen Chem 1 Final Exam Review – Saylor Questions and Answers An 56 Fe 2+ particle contains A) 28 protons, 28 neutrons, 26 electrons B) 54 protons, 56 neutrons, 52 electrons C) 58 protons, 58 neutrons, 56 electrons D) 26 protons, 26 neutrons, 26 electrons E) 26 protons, 30 neutrons, 24 electrons - ANSWER -26 protons, 30 neutrons, 24 electrons The density of mercury is 13.5 g/mL. What is the mass in kg of mercury that fills a 0.250-L flask? A) 3.38 kg B) 54.0 kg C) 3380 kg D) 0.0540 kg E) can't determine from the given information - ANSWER -3.38 kg What Answer should be reported, with the correct number of significant figures, for the following calculation? (433.621 - 333.9) × 11.900 A) 1.18680 x 10^3 B) 1.19 x 10^3 C) 1.186799 x 10^3 D) 1.1868 x 10^3 E) 1.187 x 10^3 - ANSWER -1.19 x 10^3 The correct name for HClO is A) hydrochloric acid B) chloric acid C) hypochlorous acid D) chlorous acid E) perchloric acid - ANSWER -hypochlorous acid Which species has 54 electrons? A) 112 Cd 48 B) 132 Xe+ 54 C) 132 Xe2+ 54 D) 128 Te2- 52 E) 118 Sn2+ 50 - ANSWER -128 Te2- 52 The accuracy and precision of four 10 oz (296 mL) cough syrup dispensers is evaluated by measuring the volume of three samples dispensed from each of them. Which of the following dispensers is the most precise but least accurate? A) 296.5 mL, 295.5 mL, 296.0 mL B) 299 mL, 296 mL, 293 mL C) 283.3 mL, 283.2 mL, 283.4 mL D) 298.3 mL, 294.2 mL, 296.0 mL - ANSWER -283.3 mL, 283.2 mL, 283.4 mL If the walls in a room are 955 square feet in area, and a gallon of paint covers 15 square yards, how many gallons of paint are needed for the room? A) 47 gallons B) 7.1 gallons C) 2.3 gallons D) 21 gallons E) 24 gallons - ANSWER -7.1 gallons Give the correct formula for aluminum sulfate. A) Al2S3 B) AlSO3 C) Al2(SO4)3 D) Al3(SO4)2 - ANSWER -Al2(SO4)3 How many sig figs are in the measurement, 0.0005890 g? A) 6 B) 8 C) 5 D) 4 E) 7 - ANSWER -4 Silver has an atomic mass of 107.868 amu. The Ag-109 isotope (108.905 amu) is 48.16%. What is the mass of the other isotope? A) 106.915 amu B) 106.898 amu C)106.911 amu D) 106.905 amu - ANSWER -106.905 amu Of the following _______ is the smallest mass. A) 2.5 x 10^10 ng B) 2.5 x 10^-2 mg C) 2.5 x 10^9 ug D) 2.5 x 10^15 pg E) 25 kg - ANSWER -2.5 x 10^-2 mg Which of the following is a correct feature of the nuclear atom proposed by Rutherford? A) The atom is mostly empty space, most of the mass of an atom is concentrated in its nucleus. B) All atoms of an element have the same mass. C) It is like the "plum pudding" model. D) The majority of alpha particles to strike the foil "bounded back" E) The number of neutrons and electrons in the atom are equal. - ANSWER -The atom is mostly empty space, most of the mass of an atom is concentrated in its nucleus. Which pair of atoms constitutes a pair of isotopes of the same element? A) 19 X 10 and 19 X 9 B) 17 X 8 and 15 X 8 C) 14 X 6 and 12 X 7 D) 14 X 7 and 12 X 6 E) 20 X 10 and 10 X 11 - ANSWER -17 X 8 and 15 X 8 Natural rubidium contains 72.172% of 85Rb with mass number 84.9118 amu. What is the mass number of the other isotope of rubidium? The atomic mass of Rb is 85.4678 amu. A) 86.910 amu B) 85.9098 amu C) 86.0238 amu D) 86.024 amu E) 86.91 amu - ANSWER -86.910 amu Which of the following combinations of formulas and names is correct? A) HPO4^2- (hydrogen phosphate) B) CO3^2- (carbide) C) ClO2^- (chlorate) D) Sn^4+ (lead (IV)) E) SO3^2- (sulfur trioxide) - ANSWER -HPO4^2- (hydrogen phosphate) Which of the following is the lowest temperature? A) 25 C B) 300 K C) 86 F D) the freezing point of water (0 C) E) None of the above - ANSWER -the freezing point of water Name the compound Ca(H2PO4)2 * 4H2O A) calcium dihydrogen phosphate tetrahydrate B) calcium diphosphate hydrate C) cadmium dyhydrobgen phosphate tetrahydrate D) calcium dihydrophosphate tetrahydrate E) calcium dihydrogen phosphide tetrahydrate - ANSWER -calcium dihydrogen phosphate tetrahydrate Which of the following is an example of the law of definite proportions? A) Nitrogen dioxide always has a mass ratio of 2.28 g O:1 g N B) The amount of nitrogen that combines with 1.0g of oxygen in dinitrogen oxide is twice as much as the amount of nitrogen that combines with 1.0 g of oxygen in nitrogen oxide. C) Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O: 1 g C and 2.66 g O: 1 g C. D) The atomic mass of bromine is 79.90 amu. E) A sample of chlorine is found to contain there times as much Cl-35 as Cl-37. -