Chemistry exam calculations

Anonymous
timer Asked: Jun 24th, 2018
account_balance_wallet $20

Question description

Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases_ Chemistry (University Oriented) I {CHM-131-350}.pdf

10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} Exam II -- Chemical Reac ons, Molarity and Dilu ons, REDOX Reac ons, and Gases Due Oct 15 at 11:59pm Points 100 Questions 46 Available until Oct 15 at 11:59pm Time Limit 180 Minutes Allowed Attempts 2 Take the Quiz Again A empt History LATEST Attempt Time Score Attempt 1 126 minutes 98 out of 100  Correct answers are hidden. Score for this attempt: 98 out of 100 Submitted Oct 12 at 4:12pm This attempt took 126 minutes. Question 1 2 / 2 pts You have a stock solution of 14.7 M HCl. How many milliliters of this solution should you dilute to make 655 mL of 6.00 M HCl? 267 mL 0.267 mL 135 mL 0.135 mL https://canvas.morainevalley.edu/courses/12690/quizzes/54706 1/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} 2 / 2 pts Question 2 How many moles of K2Cr2O7 are present in 50.0 mL of 0.850-M K2Cr2O7?: 0.0425 mol 0.059 mol 0.0588 mol 42.5 mol 2 / 2 pts Question 3 When the following equation is properly balanced, the coefficient in front of BaBr2 is: Ba(NO3)2 + AlBr3 à BaBr2 + Al(NO3)3 1 2 3 4 Question 4 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 2 / 2 pts 2/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} When the following equation is properly balanced, the coefficient in front of O2 is: C3H8 + O2 à H2O + CO2 7 7 24 5 2 / 2 pts Question 5 The chemical reaction below may be classified as: 4Al + 3O2 à 2Al2O3 double displacement combination decomposition precipitation Question 6 2 / 2 pts For the next three questions, assume that the reaction below occurs in water; consult the Solubility Table when needed. Pb(NO3)2 + Na2S à PbS + NaNO3 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 3/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} When the equation is properly balanced, the coefficient for sodium sulfide is: 1 2 3 Same as the coefficient for sodium nitrate 2 / 2 pts Question 7 The net ionic equation for this reaction contains ___ ion(s). Four All ions are spectator ions, there is no net ionic equation Two Three Question 8 2 / 2 pts The precipitate(s) for the above reaction is/are: https://canvas.morainevalley.edu/courses/12690/quizzes/54706 4/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} Sodium nitrate and lead(II) sulfide Sodium sulfide Lead nitrate and lead(II) sulfide Lead(II) sulfide Question 9 4 / 4 pts The reaction below takes place under acidic conditions. Balance this reaction, identify the oxidation numbers for Mn and Cl on both sides of the equation, identify which element was oxidized, which one was reduced, and state what are the oxizing and the reducing reagents. MnO4- + Cl- à Mn2+ + Cl2 When the equation is balanced, the molar coefficient in front of H+ ion is: 8 6 10 16 Question 10 2 / 2 pts The oxidation number of Mn in MnO4- is: https://canvas.morainevalley.edu/courses/12690/quizzes/54706 5/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} +2 +7 +4 -1 Question 11 2 / 2 pts The oxidation number of Cl in Cl2 is: 0 -1 -2 +2 Question 12 2 / 2 pts What is the oxidizing agent in this reaction? Cl2 ClMnO4Mn2+ https://canvas.morainevalley.edu/courses/12690/quizzes/54706 6/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} Question 13 2 / 2 pts The oxidation number of Mn in Mn+2 is: +4 +2 +1 0 Question 14 2 / 2 pts The oxidation number of Cl in Cl- is: -2 -10 -1 0 Question 15 2 / 2 pts Which of the elements below was reduced in the reaction? Mn Cl https://canvas.morainevalley.edu/courses/12690/quizzes/54706 7/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} O H Question 16 2 / 2 pts Which of the elements below was oxidized in the reaction? Mn Cl O H Question 17 2 / 2 pts What is the reducing reagent in this reaction? Mn2+ Cl2 MnO4Cl- Question 18 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 4 / 4 pts 8/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} The reaction below takes place under basic conditions. Balance this reaction, identify the oxidation numbers for I and Se on both sides of the equation, identify which element was oxidized, which one was reduced, and state what are the oxizing and the reducing reagents. IO- + Se2O32- à I- + SeO42- When the equation is balanced, the molar coefficient in front of OH- ion is: 8 6 4 2 Question 19 2 / 2 pts The oxidation number of Se in Se2O32- is: +2 0 +4 +3 Question 20 2 / 2 pts The oxidation number of I in IO- is: 0 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 9/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} -1 -2 +1 Question 21 2 / 2 pts Which of the elements below was reduced in the reaction? I Se O H Question 22 2 / 2 pts Which of the elements below was oxidized in the reaction? I Se O H Question 23 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 2 / 2 pts 10/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} What is the oxidizing agent in this reaction? Se2O32SeO42IIO- Question 24 2 / 2 pts The oxidation number of I in I- is: +1 0 -1 -3 Question 25 2 / 2 pts The oxidation number of Se in SeO42- is: +4 +2 +6 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 11/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} +12 2 / 2 pts Question 26 What is the reducing reagent in this reaction? Se2O32SeO42IIO- 2 / 2 pts Question 27 When the chemical equation below is balanced, the coefficient in front of tin(II) choloride is: AlCl3 + Sn(NO3)2 à SnCl2 + Al(NO3)3 1 2 3 4 Correct! https://canvas.morainevalley.edu/courses/12690/quizzes/54706 12/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} 2 / 2 pts Question 28 What is the precipitate that forms as a result of the reaction shown below? FeCl3 + CaS à ? Iron sulfide Calcium sulfide Calcium chloride Iron(III) sulfide Correct! 2 / 2 pts Question 29 Predict the products of the reaction below and balance the resultant chemical equation. When the equation is balanced, the coefficient in front of water is: Al(OH)3 + HNO3 à ? 1 2 3 4 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 13/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} Correct! 2 / 2 pts Question 30 The net ionic equation for the reaction below contains _____ ions, when properly balanced. NaCl + AgNO3 à ? 1 3 0 2 Correct! Question 31 2 / 2 pts Epress the pressure of 798 mm Hg in atm: 798 mm Hg = ____ atm 2.1 1.05 6.06x10*5 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 14/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} 0.952 Question 32 2 / 2 pts Express the temperature of 31.7 deg. C in deg. K: 31.7 deg. C = ____ K -304.9 K -241.5 K 241.5 K 304.9 K Incorrect Question 33 0 / 2 pts What is the volume, in L, of a 32.84-g of O2 gas at 22.97 oC and at 1.77 atm pressure? 14.1 0.989 141.0 9.89 Question 34 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 2 / 2 pts 15/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} If a 45.8 L sample of gas at 7.5 atm pressure is compressed to 35.2 L at constant temperature, what is the resultant pressure of that gas? 98 atm 97.6 atm 9.8 atm 9.76 atm 2 / 2 pts Question 35 Xenon gas in a 325-mL container has a pressure of 695 mmHg at 19.0 oC. There are _____ moles of xenon in the flask: 1.24 x 10-2 1.98 x 10-2 9.42 12.4 4 / 4 pts Question 36 Sodium azide (NaN3) inside the air bag rapidly decomposes into sodium metal and nitrogen gas upon a vehicle collision. What is the pressure inside the air bag after it inflates, given that 14.6 g of sodium azide is used and the volume of the air bag is 4.11 L at 3.00 x 102 K temperature? Hint: your chemical equation must be properly balanced. NaN3(s) à https://canvas.morainevalley.edu/courses/12690/quizzes/54706 Na(s) + N2(g) 16/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} 1.70 atm 2.02 atm 1.70 x 105 Pa 1520 mmHg 4.17 atm Question 37 2 / 2 pts A balloon has a volume of 4.39 L at 44 oC and a pressure 0.959 atm. The balloon must be cooled to ___ oC in order to reduce its volume to 3.78 L (at constant pressure): 28 0 72.9 273 Question 38 2 / 2 pts A sample of gas initially at 4.00 atm was compressed from 8.00 L to 2.00 L at constant temperature. After the compression, the gas pressure of the sample was _______ atm: 4.00 2.00 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 17/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} 12.0 16.0 Question 39 2 / 2 pts A gas at a pressure of 10.0 Pa exerts a force of ___ N on an area of 5.5 m2. 18 0.55 1.8 55 Question 40 2 / 2 pts The reaction below can be classified as: 2 AlCl3 + 3 Pb(NO3)2 -----> 2 Al(NO3)3 + 3 PbCl2 Single displacement Combustion Neutralization Double displacement Correct! https://canvas.morainevalley.edu/courses/12690/quizzes/54706 18/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} Question 41 2 / 2 pts Which of the following compounds can react in a neutralization reaction? AlCl3 Ba(OH)2 CaBr2 Na2S None of the above. Question 42 3 / 3 pts The amount of gas and pressure in a balloon are kept constant. When the gas is cooled, the volume of the balloon will _________________________. increase decrease remain constant more information is needed to finish the statement Question 43 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 3 / 3 pts 19/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} The amount of gas and temperature in a container are kept constant. When the volume of that container is increased, the pressure inside will _________________________. decrease increase remain unchanged more information is need to finish the statement Question 44 2 / 2 pts Which of the following compounds is insoluble in water? AlCl3 CoBr3 Ca(OH)2 KOH PbS Question 45 2 / 2 pts Which of the following compounds is soluble in water? PbBr2 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 20/21 10/12/2017 Exam II -- Chemical Reactions, Molarity and Dilutions, REDOX Reactions, and Gases: Chemistry (University Oriented) I {CHM-131-350} Ag2S Fe2S3 AgNO3 AgCl Question 46 2 / 2 pts How many moles of water vapor are produced in thermal decomposition reaction of 1 mol of sodium sulfate heptahydrate? No water vapor is produced in this reaction. More information is needed. 7 mol 2.5 mol 1 mol Quiz Score: 98 out of 100 https://canvas.morainevalley.edu/courses/12690/quizzes/54706 21/21

Tutor Answer

Aljon2017
School: University of Maryland

Kindl...

flag Report DMCA
Review

Anonymous
Awesome! Exactly what I wanted.

Similar Questions
Hot Questions
Related Tags

Brown University





1271 Tutors

California Institute of Technology




2131 Tutors

Carnegie Mellon University




982 Tutors

Columbia University





1256 Tutors

Dartmouth University





2113 Tutors

Emory University





2279 Tutors

Harvard University





599 Tutors

Massachusetts Institute of Technology



2319 Tutors

New York University





1645 Tutors

Notre Dam University





1911 Tutors

Oklahoma University





2122 Tutors

Pennsylvania State University





932 Tutors

Princeton University





1211 Tutors

Stanford University





983 Tutors

University of California





1282 Tutors

Oxford University





123 Tutors

Yale University





2325 Tutors