CH101, section 003, Fall 2020-WebAssign Bonus/Replacement HW#4 (Homework), ALL ANSWERS CORRECT,100% SCORE

Current Score: 0 out of 5 Due: Friday, November 21, 2008 11:59 PM EST Description REMINDER: EXAM 4 IS ON FRIDAY, NOVEMBER 21, 2008. This bonus/replacement homework is good preparation for Exam 4. Most answers are no ...

Current Score: 0 out of 5 Due: Friday, November 21, 2008 11:59 PM EST Description REMINDER: EXAM 4 IS ON FRIDAY, NOVEMBER 21, 2008. This bonus/replacement homework is good preparation for Exam 4. Most answers are not case sensitive. Therefore 'e' or 'E' look the same to webassign. The only case-sensitive answers are for element symbols. Thus iron should be 'Fe', not 'FE' or 'fe'. General Instructions for Writing Precipitation and Redox Reactions: For precipitation reactions, write reactants and products in the following order: coefficient Cation + coefficient Anion -> Precipitate 1. For redox reactions, write reactants and products in the following order: coefficient Ox 1 + coefficient Red2 -> coefficient Red 1 + coefficient Ox2 2. 3. A single arrow will be dash & greater than (->) 4. Do not enter coefficients of '1' Write subscripts as numbers with no special character, but use a "^" before each superscript. Always write the number before the sign and always include '1'. Thus, HCO 3 1- would be HCO3^1-. 5. 6. A single electron would be e^1- 7. Do not use (g), (l), (s) or (aq) Answers are case sensitive. Spaces are ignored, so insert them as you wish for readability. 8. 9. Click on the "eye" symbol to see your formatted response. 10. The input requests are the same as those used in your homework assignments. Please take the SI Survey at http://courses.ncsu.edu/eci210/lec/002/SIsurvey.html to offer feedback on the SI program. If you did not attend any SI sessions, the survey also requests feedback on reasons students do not attend SI. The survey will be available through ???. Instructions The question submission scoring is as follows: Correct on first submission: full points Correct on second submission: full points Correct on third submission: full points Correct on fourth submission: 90% of points Correct on fifth submission: 80% of points Do NOT press 'submit all questions" when you are finished. This will do exactly as indicated, and submit all questions, reducing your score. Bonus/Replacement HW#4 http://www.webassign.net/v4cgifbaraka@ncsu/student.pl?b=20... 1 of 15 12/14/08 3:11 AMThe due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. --/0.26 points | 0/5 submissions Suppose 0.60 moles of CaCl 2 is dissolved in 2500 mL of water. Calculate the concentration of cation, anion and all ions in M (mol/L). (Input your answer to as many significant figues as you would like. Two significant figures should be sufficient.) a) [Ca2+] (No Response) 0.24 M b) [Cl1-] (No Response) 0.48 M c) [all ions] (No Response) 0.72 M 2. --/0.26 points | 0/5 submissions Write the names for the following substances: a) ZnBr 2 : (No Response) zinc(II) bromide -or- zinc bromide b) Al 2O3 : (No Response) aluminum oxide c) NiCl 2 : (No Response) nickel(II) chloride d) Fe(NO 3)3: (No Response) iron(III) nitrate e) Cr(OH) 3: (No Response) chromium(III) hydroxide 3. --/0.26 points | 0/5 submissions What mass of CaCl 2 is required to make 49 mL of a 0.030 M CaCl2 solution? Bonus/Replacement HW#4 http://www.webassign.net/v4cgifbaraka@ncsu/student.pl?b=20... 2 of 15 12/14/08 3:11 AM(No Response) 0.16 g CaCl 2 How many moles of chloride ions are present in the solution? (No Response) 0.00294 mol 4. --/0.26 points | 0/5 submissions No Marks. To determine what portion of the question you have correct, click on question score at the top of the assignment. Be sure to refresh question score after each submission. Indicate whether each of the following would be more soluble in hexane (C 6H14) or water. Substance More soluble in I 2 (No Response) Hexane C 8H18 (No Response) Hexane Na 2CO3 (No Response) Water 5. --/0.26 points | 0/5 submissions No Marks. To determine what portion of the question you have correct, click on question score at the top of the assignment. Be sure to refresh question score after each submission. Indicate whether each of the following is a strong electrolyte. Substance Strong Electrolyte? I 2 (No Response) No Bonus/Replacement HW#4 http://www.webassign.net/v4cgifbaraka@ncsu/student.pl?b=20... 3 of 15 12/14/08 3:11 AMNH 4Cl (No Response) Yes NaHSO 4 (No Response) Yes 6. --/0.26 points | 0/5 submissions No Marks. To determine what portion of the question you have correct, click on question score at the top of the assignment. Be sure to refresh question score after each submission. Use the Solubility rules on your exam hand-out to decide whether a precipitate would form when each of the following pairs of aqueous solutions are mixed: Use the link S