CHM 101 Fall 2022 Exam 1 Version 2 Answers

CHM 101-Fall 2022-Exam 1-Version 2 Key 1. The quantity 0.064380 correctly expressed in scientific notation while retaining the current number of significant figures is ____. A. B. C. D. E. 6.44 × 10−2 6.4380 × 10−2 6.4380 × 102 6.4380 × 10−1 0.64380 × 10−2 2. A serving of Marie Callender’s beef stew frozen dinner contains 1430 mg of sodium. How many pounds of sodium are in a serving of this meal? (Assume three significant figures.) A. B. C. D. E. 3.15 lb 0.317 lb 0.00315 lb 317 lb 3.40 × 108 lb 3. The density of zinc is 7.13 g/cm3. What is the density of zinc in units of pounds per cubic inch (lb/in3)? 1 in3 = 16.39 cm3 A. B. C. D. E. 0.258 lb/in3 50.4 lb/in3 9.89 lb/in3 1.78 lb/in3 1.97 × 102 lb/in3 4. A merchant is working with two different bars of gold. One bar has a size of 350 cm3 and the other has a size of 700 cm3. Which of the following properties is/are identical for both gold bars? A. B. C. D. E. Density Electrical conductivity Weight Both A. and C. Both A. and B. 5. Study the following images. Which of these represents a pure compound? A. B. C. D. E. I only III only V only II and III I, IV, and V CHM 101-Fall 2022-Exam 1-Version 2 Key 6. Study the change below. Which of the following statements is consistent with what is shown? A. B. C. D. E. A physical change occurs in which the chemical composition remains the same. A chemical change occurs in which atoms rearrange to form a new compound. A chemical change occurs in which an ionic compound is formed from diatomic elements. A chemical change occurs in which the chemical composition remains the same. A physical change occurs in which atoms rearrange to form a new compound. 7. A characteristic of a substance that involves the transformations the substance can undergo to produce a different substance is known as ____. A. B. C. D. E. a physical change a chemical property an extensive property a physical transformation an unusual property 8. A(n) ____ is two or more substances that can be separated by physical means. A. B. C. D. E. element ionic compound mixture molecular compound polyatomic ion 9. An atom contains ____. A. B. C. D. E. as many neutrons as electrons as many protons as neutrons as many electrons as protons as many nuclei as electrons no protons 10. How many electrons does an Al3+ ion have? A. B. C. D. E. 40 13 16 27 10 11. The correct symbol for the ion formed by nitrogen is ____. A. B. C. D. E. N3+ N3– N2+ N+ N2 CHM 101-Fall 2022-Exam 1-Version 2 Key 12. The isotope symbol for an ion that has 53 protons, 78 neutrons, and 54 electrons is ____. A. 131 − 53I B. 131 + 53I C. 131 + 78Pt D. 107 − 78Pt E. 131 54Xe 13. Which of the following descriptions corresponds to the atomic-level diagram on the right? A. B. C. D. E. Ionic compound in a liquid state Ionic compound in a gaseous state Molecular compound in a liquid state Element in a liquid state Mixture in a gaseous state 14. Which of the following elements is a Group VA non-metal? A. B. C. D. E. Lithium, Li Calcium, Ca Phosphorus, P Argon, Ar Chlorine, Cl 15. Sodium (in Group IA) reacts with water to form hydrogen gas and a compound containing sodium, Na+, ions. Which other element from the following list is expected to react with water in a similar way? A. B. C. D. E. Silicon, Si Beryllium, Be Aluminum, Al Nitrogen, N Potassium, K 16. Which of the following statements regarding relative atomic masses is incorrect? A. Relative atomic mass is one of the numbers that appears on a typical periodic table. B. The terms “mass number” and “relative atomic mass” can be used interchangeably. C. The relative atomic mass of copper is 63.55 amu because copper-63 is the most abundant isotope, with a smaller amount of copper-65. D. Relative atomic mass is the average mass of the individual isotopes of an element considering the natural abundance of each. E. Mass spectrometry is used to find the mass of each isotope of an element and measure their abundances. 17. The species containing one nitrogen atom and two oxygen atoms and has a –1 charge is named as a ____. A. B. C. D. E. nitrate ion nitrogen dioxide nitride ion nitrite ion dioxonitronium ion CHM 101-Fall 2022-Exam 1-Version 2 Key 18. Which of the following compounds contains a polyatomic ion? A. B. C. D. E. Na2O Mg3N2 K2O MgClO3 ClO2 19. Which of the following combinations of elements would form a molecular (covalent) compound? A. B. C. D. E. Carbon and chlorine Sodium and sulfur Barium and oxygen Calcium and fluorine Zinc and copper 20. What is the correct name for the compound with the formula Al2O3? A. B. C. D. E. Aluminum trioxide Dialuminum trioxide Aluminum oxide Aluminum(III) oxide Aluminum peroxide 21. A legal case between members of the Hinkley, California community and Pacific Gas and Electric alleged that chromium VI was to blame for higher cancer rates in the area around the company’s facility. Which of the following compounds contains the chromium(VI) ion, Cr6+? In each compound, the anion is oxide, which is O2–. A. B. C. D. E. CrO Cr2O3 Cr2O Cr3O2 CrO3 22. Which of the following formula/name pairs is incorrect? A. B. C. D. E. Cu2O(s) copper(II) oxide Na2SO4(aq) sodium sulfate Na3N(s) sodium nitride Fe2S3(s) iron(III) sulfide N2O4(g) dinitrogen tetroxide 23. What is the formula for an ionic compound composed of potassium ions and sulfate ions? A. B. C. D. E. K(SO3)2 K2S KSO4 K2SO4 PSO4 24. What is the formula for an ionic compound composed of magnesium ions and nitrogen (or nitride) ions? A. B. C. D. E. Mg(NO3)2 MgNO3 Mg2NO3 MgNe Mg3N2 CHM 101-Fall 2022-Exam 1-Version 2 Key 25. The typical dose of epinephrine at a particular concentration administered to a patient under cardiac arrest is 0.1 mg per kilogram of body weight. Which of the following mathematical operations would correctly determine the dose that should be administered to a patient weighing 160 pounds? Simply set up the conversions without performing the actual calculations. A. 1 kg 160 lb 453.6 g × 1 kg × 1 lb 0.1 mg-epi × 1000 g 1 kg B. 160 lb × 453.6 g 1 kg × 1000 g 1 lb C. 160 lb × 1g 1000 kg 0.1 mg-epi × × 453.6 lb 1g 1 kg D. × 0.1 mg-epi 1 kg 0.1 mg-epi 1 kg 453.6 g × 160 lb × 1 lb 1 kg 1g 1 kg E. 453.6 g × 160 lb × 1000 g × 0.1 mg-epi 1 kg