Chemistry Test Bank

Chemistry Test Bank Which of the following equations is not balanced? Selected Answer: d. Fe3O4 + 3CO → 3Fe + 3CO2 Answers: a. (NH4)2Cr2O7 → N2 + 4H2O + Cr2O3 b. 2NaCl + Pb(NO3)2 → PbCl2 + 2NaNO3 c. C12H22O11 + 12O2 → 12CO2 + 11H2O d. Fe3O4 + 3CO → 3Fe + 3CO2 e. 2Sb2OS2 + 10O2 → 2Sb2O5 + 4SO3 Question 2 false 1 out of 1 points Ammonia can be made by reaction of water with magnesium nitride: __ Mg3N2(s) + __ H2O(l) → __ Mg(OH)2(s) + __ NH3(g) When the equation is properly balanced, the sum of the coefficients is Selected Answer: c. 12. Answers: a. 6. b. 9. c. 12. d. 14. e. 8. Question 3 0 out of 1 points Which of the following chemical equations is not balanced? Selected Answer: a. NH4NO3 → N2O + 2H2O Answers: a. NH4NO3 → N2O + 2H2O b. C12H22O11 → 12C + 11H2O c. 2NH4SCN + Ba(OH)2 • 8H2O → 2NH3 + 10H2O + Ba(SCN)2 d. 2Mg + CO2 → 2MgO + C e. (NH4)2Cr2O7 → N2O + Cr2O3 + 4H2O Question 4 0 out of 1 points Which of the following conclusions regarding Rutherford’s gold foil experiment is not consistent with the observations? Selected Answer: d. The nucleus occupies only a small portion of the space of an atom. Answers: a. Wide angle deflections result from a collision of an alpha particle and a gold atom nucleus. b. Most alpha particles travel straight through the gold foil. c. The nucleus occupies a large amount of the atom space. d. The nucleus occupies only a small portion of the space of an atom. e. The nucleus, like the alpha particles used to bombard the gold foil, is positively charged. Question 5 1 out of 1 points Sulfuric acid reacts with aqueous sodium hydroxide to produce aqueous sodium sulfate and liquid water. Which is the correct balanced chemical equation for this reaction description? Selected Answer: d. H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l) Answers: a. H2SO4(aq) + 2NaOH(aq) → Na2S(aq) + 2H2O(l) + 2O2(g) b. H2S(aq) + 2NaOH(aq) → Na2S(aq) + 2H2O(l) c. H2SO4(aq) + NaOH(aq) → NaSO4(aq) + H2O(g) d. H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l) e. H2SO4(aq) + (NaOH)2(aq) → Na2SO4(aq) + 2H2O(l) Question 6 0 out of 1 points The complete combustion of octane, C8H18, yields carbon dioxide and water: — C8 H18 + — O2→ — CO2 + — H2O The smallest whole-number coefficient of oxygen in the balanced equation is Selected Answer: a. 24. Answers: a. 24. b. 26. c. 22. d. 23. e. 25. Question 7 1 out of 1 points Which of the following molecules is a hydrocarbon? Selected Answer: c. CH3CH2CH3 Answers: a. CH3OCH3 b. H2O c. CH3CH2CH3 d. C6H12O6 e. CH3CH2OH Question 8 0 out of 1 points Which of the following is/are information that is unique to a space-filling molecular model? 1. The model shows the relative sizes of each element. 2. The model shows the charge distribution. 3. The model shows the types of bonds (single or multiple) connecting the atoms. Selected Answer: c. 3 only Answers: a. 1 only b. 2 only c. 3 only d. 1 and 2 e. 1, 2, and 3 Question 9 0 out of 1 points A sample of the mineral troegerite, (UO2)3(AsO4)2 • 12H2O, has 1.34 × 1021 U atoms. How many arsenic atoms are present in this sample of troegerite? Selected Answer: d. 2.68 × 1021 Answers: a. 6.70 × 1022 b. 8.93 × 1020 c. 2.01 × 1022 d. 2.68 × 1021 e. 1.61 × 1022 Question 10 0 out of 1 points How many of the following statements are true concerning chemical equations? I. Coefficients can be fractions. II. Subscripts can be fractions. III. Coefficients represent the relative masses of the reactants and/or products. IV. Changing the subscripts to balance an equation can be done only once. V. Atoms are conserved when balancing chemical equations. Selected Answer: a. 1 Answers: a. 1 b. 3 c. 2 d. 5 e. 4 Saturday, February 18, 2017 11:55:48 PM CST OK Open Quick Links Quick Links Page Landmarks Content Outline Keyboard Shortcuts Logout Global Menu Maria TalamantesActivity Updates33 Home Help Top Frame Tabs My Blackboard Tab 1 of 2 (active tab)The Web Tab 2 of 2 Current Location College Chemistry I (CHE125.SP17.ZA) Assignments ... Module 2 - Atoms, Molecules, and Ions Chapter Quizzes and Module Textbook Exam Review Test Submission: Chapter 2 Quiz - Atomic Theory and Balancing Equations Menu Management Options College Chemistry I (CHE125.SP17.ZA) 79db5df3-def4-4 Home Page Announcements Staff Info Syllabus & Resources Assignments Discussion Board My Grades Send Email Apps Tutoring Review Test Submission: Chapter 2 Quiz - Atomic Theory and Balancing Equations Content User Maria Talamantes Course College Chemistry I (CHE125.SP17.ZA) Test Chapter 2 Quiz - Atomic Theory and Balancing Equations Started 2/18/17 11:57 PM Submitted 2/19/17 12:14 AM Status Completed Attempt Score 7 out of 10 points Time Elapsed 16 minutes Results Displayed All Answers, Submitted Answers, Feedback, Incorrectly Answered Questions Question 1 0 out of 1 points Experiments were carried out in which a beam of cathode rays was first bent by a magnetic field and then bent back by an electrostatic field until the beam hit the screen exactly where it had been hitting before the fields were applied. This experiment permitted the direct measurement of Selected Answer: a. the mass of the atom. Answers: a. the mass of the atom. b. the ratio of mass to charge of an electron. c. the charge on the nucleus of an atom. d. false the mass of the electron. e. the charge on the electron. Question 2 1 out of 1 points Which one of the following equations is properly balanced? Selected Answer: b. Sn + 4HNO3 → SnO2 + 4NO2 + 2H2O Answers: a. CH3CHO + 3O2 → 2CO2 + 2H2O b. Sn + 4HNO3 → SnO2 + 4NO2 + 2H2O c. 2Na2SO4 + 3Bi(NO3)3 → Bi2(SO4)3 + 9NaNO3 d. NH4NO3 → 2H2O + N2 e. Na2CO3 + 2H2SO4 → Na2SO4 + 2H2O + CO2 Question 3 0 out of 1 points When the equation __ C5H6N2OS(s) + __ O2(g) → __ CO2(g) + __ H2O(l) + __ N2(g) + __ SO2(g) is balanced, the sum of all the coefficients (simplest whole number) is Selected Answer: a. 19. Answers: a. 19. b. 21. c. 24. d. 18. e. 20. Question 4 1 out of 1 points Sulfuric acid reacts with aqueous sodium hydroxide to produce aqueous sodium sulfate and liquid water. Which is the correct balanced chemical equation for this reaction description? Selected Answer: c. H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l) Answers: a. H2SO4(aq) + NaOH(aq) → NaSO4(aq) + H2O(g) b. H2SO4(aq) + 2NaOH(aq) → Na2S(aq) + 2H2O(l) + 2O2(g) c. H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l) d. H2SO4(aq) + (NaOH)2(aq) → Na2SO4(aq) + 2H2O(l) e. H2S(aq) + 2NaOH(aq) → Na2S(aq) + 2H2O(l) Question 5 1 out of 1 points Who discovered the electron? Selected Answer: e. Thomson Answers: a. de Broglie b. Rutherford c. Bohr d. Heisenberg e. Thomson Question 6 0 out of 1 points Which of the following statements best describes the particulate representation depicted by the picture? Selected Answer: a. The figure is a representation of a gas of a compound. Answers: a. The figure is a representation of a gas of a compound. b. The figure is a representation of a molecular solid. c. The figure is a representation of a gas made up of a single element. d. The figure is a representation of a liquid mixture of two elements. e. The figure is a representation of a liquid mixture of two compounds. Question 7 1 out of 1 points In the following chemical equation, what is the reactant? CuSO4·5H2O(s) → CuO(s) + SO3(g) + 5H2O(l) Selected Answer: e. CuSO4·5H2O(s) Answers: a. CuSO4(s) b. SO3(g) c. CuO(s) d. H2O(l) e. CuSO4·5H2O(s) Question 8 1 out of 1 points Which of the following pairs of compounds can be used to illustrate the law of multiple proportions? Selected Answer: b. NO and NO2 Answers: a. CH4 and CO2 b. NO and NO2 c. NH4 and NH4Cl d. H2O and HCl e. ZnO2 and ZnCl2 Question 9 1 out of 1 points Which of the following molecules contains the alcohol functional group? Selected Answer: d. CH3OH Answers: a. C6H6 b. CH4 c. C2H2 d. CH3OH e. CH3OCH3 Question 10 1 out of 1 points Which of the following equations is not balanced