Chemistry 100 Practice Exam 2 PDF

Chemistry 100 Practice Exam 2 Name___________________________________________ Date_________  Answer Sheet Answers to multiple choice (Version A): 1. ____________ 2. ____________ 3. ____________ 4. ____________ 5. ____________ 6....

Chemistry 100 Practice Exam 2 Name___________________________________________ Date_________  Answer Sheet Answers to multiple choice (Version A): 1. ____________ 2. ____________ 3. ____________ 4. ____________ 5. ____________ 6. ____________ 7. ____________ 8. ____________ 9. ____________ 10.____________ 11.____________ 12.____________ 13.____________ 14.____________ 15.____________ ____________I - Multiple Choice - For each of the following, fill in the space on the answer sheet which corresponds to the one best answer. 1) How many 250.0 mg aspirin tablets can be prepared from 1.5 kg aspirin? a) 6.0 × 103 b) 6.0 c) 2.5 × 102 d) 1.5 × 103 e) 6 × 102 2) Platinum is one of the densest elements. Given that the density of platinum is 21.4 g/mL, what is the mass in pounds of 2.00 L of platinum? 1 kg = 2.205 lb a) 0.206 b) 2.14 × 104 c) 94.4 d) 4.28 × 104 e) 1.06 × 10-2 3) Isotopes are atoms which contain... a) equal numbers of protons, but different numbers of neutrons. b) equal numbers of protons, but different numbers of electrons. c) equal numbers of neutrons, but different numbers of protons. d) equal numbers of neutrons, but different numbers of electrons. e) the same number of neutrons as electrons. 4) A liquid has a density of 0.718 g/mL. How many mL of this liquid are needed to supply 5.00 g? a) 3.59 b) 6.96 c) 5.00 d) 0.718 e) 5.72 5) How many protons are contained in one molecule of N2O4? a) 6 b) 15 c) 46 d) 30 e) 34 6) How many electrons are contained in SO32-? a) 26 b) 38 c) 40 d) 24 e) 42 7) Which of the following is a metalloid? a) magnesium b) bromine c) silicon d) copper e) potassium 8) Which of the following statements is not true? 95 a) Mo contains 42 neutrons. 51 b) V has an atomic number of 23. c) C has the same number of protons, neutrons and electrons. d) Zn has the same number of electrons and protons. e) Fe-56 contains 30 neutrons. 9) How many mol of carbon are present in 5.00 g C3H8? a) 0.340 b) 0.113 c) 12.0 d) 15.0 e) 1.25 10) What is the molar mass of NaOH? a) 23.0 g/mol b) 20.0 g/mol c) 11.0 g/mol d) 18.0 g/mol e) 40.0 g/mol 11) How many hydrogen atoms are present in 1.50 mol NH3? a) 2.71 × 1025 b) 2.71 × 1024 c) 9.03 × 1023 d) 1.50 e) 1.34 × 1023 12. What is the identity of element Q if the ion Q2+ contains 18 electrons? a) C b) O c) Ne d) Ca e) B 13. How many molecules of glucose, C6H12O6, are in 3.00 g glucose? The molar mass of glucose is 180.156 g/mol. a) 1.67 × 10-2 b) 1.00 × 1022 c) 1.81 × 1024 d) 3.35 × 1021 e) 3.25 × 1026 14. Which element is an alkaline earth metal? a) K b) Mg c) C d) Sn e) Fe 15. A positive ion is called a __________. a) Cation, and it has lost electrons. b) Cation, and it has gained electrons. c) Anion, and it has gained electrons. d) Isotope, and it has lost electrons e) Isotope, and it has lost neutrons. Part II - Answer each of the following. You must SHOW ALL WORK! 1) How many grams of NaHCO3 are needed to provide 0.156 mol NaHCO3? 2) A 1.35-ounce piece of jewelry is 37.4% gold, Au. How many atoms of gold are in this jewelry? (1 ounce = 28.35 g) 3) For each of the following, name or give the formula as appropriate. a) potassium hydroxide b) aluminum oxide c) carbon tetrachloride d) sodium acetate e) iron (II) oxide f) NH4 CN g) CaCO3 h) CrS i) ClF3 j) BaSO4 4) A car is driving at 45 mi/h. What is the speed in m/s? (1 mi = 1.609 km).