Chapter 1-3 Practice Problems PDF

Chapter 1-3 Practice Problems Dr. Nguyen Chapter 1 Matter, Measurement, and Problem Solving Selected from Chemistry: A Molecular Approach, 6e (Tro) 1) The statement, "In a chemical reaction, matter is neither created nor destroyed" is called...

Chapter 1-3 Practice Problems Dr. Nguyen Chapter 1 Matter, Measurement, and Problem Solving Selected from Chemistry: A Molecular Approach, 6e (Tro) 1) The statement, "In a chemical reaction, matter is neither created nor destroyed" is called A) the Law of Conservation of Mass. B) Dalton's Atomic Theory. C) the Scientific Method. D) the Law of Multiple Proportions. E) the Law of Definite Proportions. 2) Identify a gas. A) definite volume and definite shape B) definite volume and no definite shape C) definite shape and no definite volume D) no definite shape and no definite volume 3) Which of the following statements about the phases of matter is TRUE? A) In both solids and liquids, the atoms or molecules pack closely to one another. B) Liquids are highly compressible. C) Gaseous substances have no space between atoms or molecules. D) There is only one type of geometric arrangement that the atoms or molecules in any solid can adopt. E) Solids are free to move around. 4) A substance that can't be chemically broken down into simpler substances is A) a homogeneous mixture. B) an element. C) a heterogeneous mixture. D) a compound. E) an electron. 5) A substance composed of two or more elements in a fixed, definite proportion is A) a homogeneous mixture. B) a heterogeneous mixture. C) a compound. D) a solution. E) an alloy. 6) Two or more substances in variable proportions, where the composition is constant throughout are A) a compound. B) an element. C) a heterogeneous mixture. D) a homogeneous mixture. E) a crystalline solid. 1 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen 7) Determine the density of an object that has a mass of 149.8 g and displaces 12.1 mL of water when placed in a graduated cylinder. A) 8.08 g/mL B) 1.38 g/mL C) 12.4 g/mL D) 18.1 g/mL E) 11.4 g/mL 8) Determine the volume of an object that has a mass of 455.6 g and a density of 19.3 g/cm 3. A) 87.9 mL B) 42.4 mL C) 18.5 mL D) 23.6 mL E) 31.2 mL 9) Osteoporosis is a condition in which the bone density becomes low. Healthy bones in young adults have a bone density of 1.0 g/cm3. Identify the incorrect statement. A) Treatment for osteoporosis includes taking calcium. B) Low density bones absorb less x-ray than high density bones. C) A bone density of 1.5 g/cm3 is caused by osteoporosis. D) Exercise decreases osteoporosis. E) Osteoporosis is most common in postmenopausal women. 10) Read the water level with the correct number of significant figures. A) 5 mL B) 5.3 mL C) 5.32 mL D) 5.320 mL E) 5.3200 mL 11) Read the temperature with the correct number of significant figures. A) 87°C B) 87.2°C C) 87.20°C D) 87.200°C E) 87.2000°C 12) Read the length of the metal bar with the correct number of significant figures. A) 20 cm B) 15 cm C) 15.0 cm D) 15.00 cm E) 15.000 cm 2 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen 13) What answer should be reported, with the correct number of significant figures, for the following calculation? (433.621 - 333.9) × 11.900 A) 1.19 × 103 B) 1.187 × 103 C) 1.1868 × 103 D) 1.18680 × 103 E) 1.186799 × 103 14) 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) 21 gallons C) 7.1 gallons D) 24 gallons E) 2.3 gallons 15) Gas is sold for $1.399 per liter in Toronto, Canada. Your car needs 12.00 gallons. How much will your credit card be charged in Canadian dollars? A) $16.79 B) $67.15 C) $4.44 D) $63.54 16) Identify the longest length. A) 3.05 ft B) 38.0 in C) 1.04 yd D) 1.05 m E) 86.87 cm Global: G4 17) Identify a state of matter. A) boiling point B) liquid C) color D) mass E) solubility 18) Choose the pure substance from the list below. A) coffee B) a casserole C) carbon dioxide D) salt water E) orange juice 3 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen 19) A pop tart is an example of A) a compound. B) an element. C) a heterogeneous mixture. D) a homogeneous mixture. 20) Gold is an example of A) a compound. B) an element. C) a heterogeneous mixture. D) a homogeneous mixture. 21) Choose the pure substance from the list below. A) lemonade B) sugar C) air D) beer E) juice 22) Which of the following is an example of physical change? A) frost appearing B) a Halloween light stick glows after shaking. C) lettuce wilting D) an oxygen balloon explodes when contacted with a flame. E) None of the above is a physical change. 23) Which of the following is an example of a chemical change? A) dry ice sublimes B) a match burns C) rubbing alcohol evaporates D) ice melting E) All of the above are examples of chemical change. 24) Which of the following represents a physical property? A) Sodium metal is extremely reactive with chlorine gas. B) Mercury is a silvery liquid at room temperature. C) Copper has a tendency to "rust." D) Methane is highly flammable. E) Neon has an unreactive nature. 25) Which of the following is an example of intensive properties? A) color B) height C) volume 4 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen D) None of the above is an example of intensive properties. E) All of the above are examples of intensive properties. 26) A piece of metal ore weighs 9.25 g. When a student places it into a graduated cylinder containing water, the liquid level rises from 21.25 mL to 26.47 mL. What is the density of the ore? A) 0.340 g/mL B) 0.564 g/mL C) 1.77 g/mL D) 2.94 g/mL 27) A mass of mercury occupies 0.550 L. What volume would an equal mass of ethanol occupy? The density of mercury is , and the density of ethanol is 0.789 g/mL. A) 0.0320 L B) 0.106 L C) 9.44 L D) 31.2 L 28) How many significant figures are in 0.00186600 mL? A) 3 B) 4 C) 5 D) 6 E) 7 29) Round the following number to four significant figures and express the result in standard exponential notation: 0.00222755 A) 0.2228 × 10 -2 B) 0.002228 C) 2.228 × 103 D) 2.228 × 10-3 E) 22.28 × 102 30) Which of the following numbers has the greatest number of significant figures? A) 0.5070 B) 0.201 C) 418000 D) 1.06 × 1024 31) How many of the following numbers contain 3 significant figures? 0.105 1.050 0.0200 9.05 × 1024 A) one B) two 5 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen C) three D) four 32) How many significant figures are there in the answer for the following problem? 56.4 + 0.7711 + 17 = ? A) one B) two C) three D) four 33) How many significant figures are there in the answer for the following problem? =? A) one B) two C) three D) four 34) An ethane molecule contains 2 atoms of carbon. The number 2 represents how many significant figures? A) one B) two C) three D) infinite 35) The width, length, and height of a large, custom-made shipping crate are 1.32 m, and respectively. The volume of the box using the correct number of significant figures is ________. A) 1.78200 B) 1.8 C) 1.78 D) 1.782 E) 1.7820 36) Identify a unit that is used for area. A) in3 B) yd C) cm2 D) degrees Celsius E) km 37) The mass of a proton is 1.67 × 10-27 kg. What is the mass of a proton in gigagrams? A) 1.67 × 10-39 Gg B) 1.67 × 10-36 Gg 6 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen C) 1.67 × 10-33 Gg D) 1.67 × 10-30 Gg 38) A student weighed 500.0 μg of sulfur in the lab. This is the same mass as A) 5.000 × 10-7 g. B) 5.000 × 10-4 kg. C) 5.000 × 10-4 mg. D) 5.000 × 105 ng. 39) The average distance between nitrogen and oxygen atoms is 115 pm in a compound called nitric oxide. What is this distance in nanometers? A) 1.15 × 10-2 nm B) 1.15 × 10-1 nm C) 1.15 × 1015 nm D) 1.15 × 1019 nm 40) Which of the following volumes is equal to 16 mL? A) 16 cm3 B) 16 dm3 C) 0.16 L D) 0.00016 kL 41) How many kL does a 8.51 × 108 cL sample contain? A) 8.51 × 103 kL B) 8.51 × 1013 kL C) 8.51× 104 kL D) 8.51 × 1012 kL E) 8.51 × 102 kL 42) How many cm3 are contained in 3.83 × 107 mm3? A) 3.83 × 107 cm3 B) 3.83 × 104 cm3 C) 3.83 × 10-10cm3 D) 3.83 × 1024 cm3 E) 3.83 × 1015 cm3 43) A fishing boat accidentally spills 3.0 barrels of diesel oil into the ocean. Each barrel contains 42 gallons. If the oil film on the ocean is 2.5 × 102 nm thick, how many square meters will the oil slick cover? A) 1.9 × 10-3 m2 B) 1.9 × 106 m2 7 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen C) 1.9 × 107 m2 D) 1.9 × 10-6 m2 E) none of these 44) How many liters of wine can be held in a wine barrel whose capacity is 23.0 gal? A) 1.65 × B) 0.165 C) 87.1 D) 6.08 × E) 6.08 45) A person weighs 77.1 kg. What is his weight in pounds? A) 154 pounds B) 170 pounds C) 35.0 pounds D) 30.8 pounds E) 193 pounds 46) If an object has a density of 3.99 g/cm3, what is its density in units of kg/m3? A) 3.99 × 10-3 kg/m3 B) 3.99 × 10-7 kg/m3 C) 3.99 × 103 kg/m3 D) 3.99 × 101 kg/m3 E) 3.99 × 10-1 kg/m3 47) Classify the change represented in the molecular diagram shown below. A) Physical and chemical change B) Physical change only C) Chemical change only D) No change E) Undetermined 8 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen Answers to Chapter 1 Practice Problems 1) A 2) D 3) A 4) B 5) C 6) D 7) C 8) D 9) C 10) B 11) C 12) C 13) A 14) C 15) D 16) D 17) B 18) C 19) C 20) B 21) B 22) A 23) B 24) B 25) A 26) C 27) C 28) D 29) D 30) A 31) C 32) B 33) B 34) D 35) B 36) C 37) C 38) D 39) B 40) A 9 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen 41) A 42) B 43) B 44) C 45) B 46) C 47) B 10 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen Chapter 2 Atoms and Elements Selected from Chemistry: A Molecular Approach, 6e (Tro) 1) Which of the following statements is FALSE according to Dalton's Atomic Theory? A) Atoms combine in simple whole number ratios to form compounds. B) All atoms of chlorine have identical properties that distinguish them from other elements. C) One carbon atom will combine with one oxygen atom to form a molecule of carbon monoxide. D) Atoms of sodium do not change into another element during chemical reaction with chlorine. E) An atom of nitrogen can be broken down into smaller particles that will still have the unique properties of nitrogen. 2) The mass number is equal to A) the sum of the number of the electrons and protons. B) the sum of the number of the neutrons and electrons. C) the sum of the number of protons, neutrons, and electrons. D) the sum of the number of protons and neutrons. E) the number of protons 3) The atomic number is equal to A) the number of the protons. B) the sum of the number of the neutrons and electrons. C) the sum of the number of protons, neutrons, and electrons. D) the sum of the number of protons and neutrons. E) the sum of the number of protons and electrons. 4) What does "X" represent in the following symbol? X A) mercury B) chlorine C) scandium D) bromine E) selenium 5) Determine the number of protons, neutrons, and electrons in the following: X A) p+ = 18 n° = 18 e- = 22 B) p+ = 18 n° = 22 e- = 18 C) p+ = 22 n° = 18 e- = 18 D) p+ = 18 n° = 22 e- = 40 E) p+ = 40 n° = 22 e- = 18 11 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen 6) What element is defined by the following information? p+ = 11 n° = 12 e- = 11 A) sodium B) vanadium C) magnesium D) titanium E) selenium 7) Which of the following statements about subatomic particles is FALSE? A) A neutral atom contains the same number of protons and electrons. B) Protons have about the same mass as electrons. C) Neutrons have no charge. D) Protons and electrons have opposite, but equal in magnitude, charges. E) Neutrons and protons are found in the nucleus of an atom. 8) Which of the following statements about isotopes is TRUE? A) Isotopes of the same element differ only in the number of protons. B) A mass spectrometer can detect the different isotopes. C) Isotopes of the same element have the same mass. D) Isotopes of the same element don't usually have the same properties. E) All elements only have one isotope. 9) What species is represented by the following information? p+ = 12 n° = 14 e- = 10 A) Si4+ B) Mg C) Ne D) Si E) Mg2+ 10) What species is represented by the following information? p+ = 47 n° = 62 e- = 46 A) Ag+ B) Nd C) Pd D) Ag E) Pd+ 11) Predict the charge of an aluminum ion. A) 5- B) 1+ C) 1- D) 2+ 12 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen E) 3+ 12) Which of the following statements is TRUE? A) Calcium is a nonmetal. B) Argon is fairly unreactive. C) Silicon is a metal. D) Uranium is a lanthanide. E) Polonium is a metalloid. 13) Which of the following does NOT describe a metal? A) good conductor of heat B) good conductor of electricity C) tends to gain electrons D) forms ionic compounds with nonmetals E) found on the left side of the periodic table 14) Which of the following statements is TRUE? A) Nonmetals are located on the right side of the periodic table. B) Metals tend to gain electrons. C) Noble gases are very reactive. D) Alkali metals are generally not reactive. E) Nonmetals tend to lose electrons. 15) The atomic mass for cadmium is A) 48 B) 112.41 C) 40.08 D) 20 E) 64.411 16) Silver has an atomic mass of 107.868 amu. The Ag-109 isotope (108.905 amu) is 48.16%. What is the amu of the other isotope? A) 106.9 amu B) 107.1 amu C) 106.7 amu D) 107.3 amu 17) Calculate the atomic mass of element "X", if it has 2 naturally occurring isotopes with the following masses and natural abundances: X-45 44.8776 amu 32.88% X-47 46.9443 amu 67.12% A) 46.26 amu B) 45.91 amu C) 46.34 amu 13 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen D) 46.84 amu E) 44.99 amu 18) What mass (in mg) does 2.63 moles of nickel have? A) 44.8 mg B) 2.23 × 104 mg C) 129 mg D) 3.56 × 105 mg E) 1.54 × 105 mg 19) How many moles of Kr are contained in 398 mg of Kr? A) 4.75 × 10-3 moles Kr B) 33.4 moles Kr C) 2.11 × 10-4 moles Kr D) 2.99 × 10-3 moles Kr E) 1.19 × 10-4 moles Kr 20) How many phosphorus atoms are contained in 158 kg of phosphorus? A) 3.07 × 1027 phosphorus atoms B) 2.95 × 1027 phosphorus atoms C) 3.25 × 1028 phosphorus atoms D) 1.18 × 1024 phosphorus atoms E) 8.47 × 1024 phosphorus atoms 21) Calculate the mass (in ng) of 2.33 × 1020 atoms of O. A) 6.19 × 106 ng B) 1.62 × 107 ng C) 2.25 × 103 ng D) 3.73 × 106 ng E) 4.69 × 107 ng 22) Identify the element that has an atomic number of 70. A) mercury B) gallium C) ytterbium D) bromine E) oxygen 23) An atom of 17O contains ________ electrons. A) 17 B) 25 C) 9 14 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen D) 11 E) 8 24) How many neutrons are in nickel-59? A) 28 B) 30 C) 31 D) 30.7 E) 58.7 25) An ion has 8 protons, 9 neutrons, and 10 electrons. The symbol for the ion is A) 17O2-. B) 17O2+. C) 19F+. D) 19F-. E) 17Ne2+. 26) Which of the following represent isotopes? A: X B: X C: X D: X A) A and D B) A and C C) B and C D) C and D E) all of the above 27) In which of the following sets do all species have the same number of electrons? A) Cl-, Ar, Ca2+ B) C, N3-, O2- C) Mg2+, Sr2+, Ba2+ D) Br, Br-, Br+ 28) Lithium belongs to the ________ group of the periodic table. A) alkali metal B) alkaline earth metal C) halogen D) metalloid 29) Which of the following elements has chemical properties similar to tellurium? A) chlorine B) lithium C) hydrogen D) sulfur 15 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen E) krypton 30) Which of the following contains the most atoms? You shouldn't need to do a calculation here. A) 10.0 g Na B) 10.0 g Li C) 10.0 g K D) 10.0 g Rb E) 10.0 g Cs 31) How many Cu atoms are contained in 896 g of Cu? A) 5.90 × 1025 Cu atoms B) 4.25 × 1021 Cu atoms C) 8.49 × 1024 Cu atoms D) 4.27 × 1022 Cu atoms E) 8.22 × 1024 Cu atoms 32) Which of the following does NOT contain the same number of atoms as 3.30 moles of Li? A) 3.30 moles of Li B) 14.5 moles of Ta C) 3.30 moles of Pb D) 3.30 moles of Cu E) 3.30 moles of Au 33) Which of the following is equal to exactly 1 mole of atoms? A) 6.00 grams of carbon B) 31.93 grams of cobalt C) 26.98 grams of aluminum D) 12.31 grams of magnesium E) 34.00 grams of selenium 34) Which of the following is equal to exactly Avogadro's number of atoms? A) 8.00 grams of oxygen B) 30.69 grams of nickel C) 4.003 grams of helium D) 11.99 grams of sodium E) 35.00 grams of bromine 16 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen Answers to Chapter 2 Practice Problems 1) E 2) D 3) A 4) D 5) B 6) A 7) B 8) B 9) E 10) A 11) E 12) B 13) C 14) A 15) B 16) A 17) A 18) E 19) A 20) A 21) A 22) C 23) E 24) C 25) A 26) B 27) A 28) A 29) D 30) B 31) C 32) B 33) C 34) C 17 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen Chapter 3 Molecules and Compounds Selected from Chemistry: A Molecular Approach, 6e (Tro) 1) What is the empirical formula for Hg2(NO3)2? A) Hg2(NO3)2 B) HgNO3 C) Hg(NO3)2 D) Hg2NO3 E) Hg4(NO3)4 2) Give the formula for cobaltous phosphate. A) Co2PO4 B) Co3(PO4)2 C) Co2(PO4)3 D) CoPO4 E) Co(PO4)2 3) Give the name for TiHCO3. A) titanium(II) carbonate B) titanium(II) bicarbonate C) titanium(I) carbonate D) titanium(I) bicarbonate E) titanium(I) bicarbonite 4) Write the name for Sn(SO4)2. A) tin(I) sulfite B) tin(IV) sulfate C) tin sulfide D) tin(II) sulfite E) tin(I) sulfate 5) Give the name for KMnO4. A) potassium manganese tetraoxide B) potassium manganate C) potassium permanganate D) potassium permagnesium E) potassium magnesate 6) Give the correct formula for aluminum sulfate. A) Al2SO4 B) Al(SO4)3 C) Al3(SO4)2 18 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen D) Al2(SO4)3 E) AlSO4 7) Give the name for H2CO3. A) carbonous acid B) dihydrogen carbonate C) carbonic acid D) hydrocarbonic acid E) hydrocarbide acid 8) Give the formula for sulfurous acid. A) H2SO3 B) HSO3 C) H2SO4 D) HSO4 E) H2SO2 9) Give the name for P4O10. A) phosphorus(IV) oxide B) diphosphorus pentoxide C) phosphorus oxide D) phosphorus(II) oxide E) tetraphosphorus decoxide 10) Calculate the molar mass of Al(C2H3O2)3. A) 86.03 g/mol B) 204.13 g/mol C) 56.00 g/mol D) 258.09 g/mol E) 139.99 g/mol 11) How many molecules of N2O4 are in 76.3 g N2O4? A) 5.54 × 1025 N2O4 molecules B) 7.26 × 1023 N2O4 molecules C) 1.38 × 1024 N2O4 molecules D) 4.59 × 1025 N2O4 molecules E) 4.99 × 1023 N2O4 molecules 12) How many C2H4 molecules are contained in 45.8 mg of C2H4? A) 9.83 × 1020 C2H4 molecules B) 7.74 × 1026 C2H4 molecules 19 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen C) 2.71 × 1020 C2H4 molecules D) 3.69 × 1023 C2H4 molecules E) 4.69 × 1023 C2H4 molecules 13) Determine the number of moles of sodium in 1.60 moles of sodium phosphate. A) 6.40 moles of sodium B) 3.20 moles of sodium C) 9.60 moles of sodium D) 1.60 moles of sodium E) 4.80 moles of sodium 14) Calculate the mass percent composition of sulfur in Al2(SO4)3. A) 28.12% B) 9.372% C) 42.73% D) 21.38% E) 35.97% 15) How many atoms of oxygen are contained in 47.6 g of Al 2(CO3)3? A) 1.23 × 1023 O atoms B) 2.96 × 1024 O atoms C) 2.87 × 1025 O atoms D) 1.10 × 1024 O atoms E) 3.68 × 1023 O atoms 16) How many SO32- ions are contained in 99.6 mg of Na2SO3? A) 1.52 × 1027 SO3 ions B) 4.76 × 1020 SO3 ions C) 2.10 × 1021 SO3 ions D) 1.05 × 1021 SO3 ions E) 9.52 × 1020 SO3 ions 17) Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g/mL and its molar mass is 86.17 g/mol. A) 8.59 mL B) 13.5 mL C) 7.40 mL D) 12.4 mL E) 11.6 mL 20 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen 18) Determine the molecular formula of a compound that has a molar mass of 122.11 g/mol and an empirical formula of C2H5O2. A) C2H5O2 B) C6H15O6 C) C3H7O3 D) C4H10O4 E) C8H20O8 19) Determine the empirical formula for a compound that is 36.86% N and 63.14% O by mass. A) NO B) N2O C) NO2 D) N2O3 E) NO3 20) Determine the empirical formula for a compound that is found to contain 10.15 mg P and 34.85 mg Cl. A) P3Cl B) PCl C) PCl2 D) P2Cl3 E) PCl3 21) Determine the molecular formula of a compound that is 49.48% carbon, 5.19% hydrogen, 28.85% nitrogen, and 16.48% oxygen. The molecular weight is 194.19 g/mol. A) C8H12N4O2 B) C4H5N2O C) C8H10N4O2 D) C8H10N2O 22) What is the empirical formula for C16H32O8? A) C2H5O B) CHO C) C2H4O D) CHO3 E) CH2O 23) Which of the following is a molecular compound? A) NaCN B) NaOH 21 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen C) SrBr2 D) ZnS E) P4O10 24) In which set do all elements tend to form anions in binary ionic compounds? A) Na, Al, Pb B) K, Mn, Br C) N, As, K D) Se, F, Cl 25) Which of the following is the correct chemical formula for a molecule of chlorine? A) Cl B) Cl- C) Cl2+ D) Cl2 26) Which of the compounds, KH, HS, C4H10, IBr3 are ionic compounds? A) only C4H10 B) only KH C) KH and HS D) HS, C4H10, and IBr3 27) Which of the following is a molecular element? A) krypton B) lithium C) sulfur D) magnesium E) titanium 28) Which of the following exists as a diatomic molecule? A) oxygen B) carbon C) phosphorus D) calcium E) neon 29) Identify the element whose ion only exists as 2+. A) strontium B) rubidium C) copper D) carbon E) radon 22 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen 30) In which set do all elements tend to form cations in binary ionic compounds? A) Rb, Al, O B) Ca, Zn, Hg C) N, As, Bi D) Se, I, Br 31) What is the charge on the Fe ions in Fe2O3? A) 3- B) 1+ C) 2- D) 3+ E) 4- 32) The solid compound, Li2SO4, contains A) Li+, S6+, and O2- ions. B) Li+ and SO42- ions. C) Li2+ and SO42- ions. D) Li2SO4 molecules. 33) What is the molar mass of nitrogen gas? A) 14.0 g/mol B) 28.0 g/mol C) 6.02 × 1023 g/mol D) 1.20 × 1023 g/mol 34) What mass of ethane, C2H6, contains the same number of molecules as 3.00 g of trichlorofluoromethane, CCl3F? A) 0.0727 g B) 0.655 g C) 1.52 g D) 13.7 g 35) 6.00 moles of potassium perchlorate contains the same number of atoms as A) 6.00 moles of sodium permanganate. B) 6.00 moles of sodium phosphate. C) 6.00 moles of barium sulfide. D) 6.00 moles of sodium cyanide. E) 6.00 moles of sodium nitrite. 23 Copyright © 2023 Pearson Education, Inc. Chapter 1-3 Practice Problems Dr. Nguyen Answers to Chapter 3 Practice Problems 1) B 2) B 3) D 4) B 5) C 6) D 7) C 8) A 9) E 10) B 11) E 12) A 13) E 14) A 15) D 16) B 17) E 18) D 19) D 20) E 21) C 22) C 23) E 24) D 25) D 26) B 27) C 28) A 29) A 30) B 31) D 32) B 33) B 34) B 35) A 24 Copyright © 2023 Pearson Education, Inc.