CH102 Prelab 03 Solubility ..
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CH102 Prelab 03 Solubility ..

Course Number: CHEM 102, Spring 2009

College/University: N.C. State

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CH102 Prelab 03 Solubility Rules http://www.webassign.net/v4cgismayor@ncsu/student.pl?m=200909242... WebAssign CH102 Prelab 03 Solubility Rules (Prelab) Stephanie Mayor CH 102, section 023, Fall 2009 Instructor: Matthew Correll Lehman TA Due: Monday, September 14, 2009 11:00 PM EDT About this Assignment Ask Your Teacher Extension Requests Question Points 1 2 3 4 56 4.16 4.16 4.16 4.16 4.16 4.2 Total 25/25...

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Prelab CH102 03 Solubility Rules http://www.webassign.net/v4cgismayor@ncsu/student.pl?m=200909242... WebAssign CH102 Prelab 03 Solubility Rules (Prelab) Stephanie Mayor CH 102, section 023, Fall 2009 Instructor: Matthew Correll Lehman TA Due: Monday, September 14, 2009 11:00 PM EDT About this Assignment Ask Your Teacher Extension Requests Question Points 1 2 3 4 56 4.16 4.16 4.16 4.16 4.16 4.2 Total 25/25 Instructions Special instructions for inputting chemical formulas and ions! To enter a cation or anion, enter the chemical symbol of the element, followed by a carat (^) and the charge. For example, NO31- would be entered as NO3^1-. Ca2+ would be entered as Ca^2+. Please do not put parentheses around individual cations or ions. To enter a chemical formula,first enter the chemical symbol of the cation, followed by any subscript that is greater than 1. Then enter the chemical symbol of the anion, followed by any subscript that is greater than one. When entering polyatomic ions (ions composed of more than one atom), such as NH41+ or CO32-, please do NOT use parentheses around the polyatomic ion if only one is present. However, if more than one is required, place parentheses around the polyatomic ion and place the subscript outside the parenthese. For example, NH4Cl would be input as NH4Cl. (NH4)2CO3 would be input as (NH4)2CO3. If you wish to look at your response in "chemistry font" (with subscripts and superscripts) before you submit, click on the icon next to the answer box. You are strongly urged to do so to make sure the ion looks right. The due date for this assignment is past. Your work can be viewed below, but no changes can be made. Important! Before you view the answer key, decide whether or not you plan to request an extension. Your Instructor may not g rant you an extension if you have viewed the answer key. Request Extension View Key 1. /4.16 points 1/3 submissions Notes Green checks and red X's are not displayed for this question. These questions concern safety issues in the Solubility Rules lab. Select the correct response from each pull-down menu. a. Some of the cations are toxic . b. They should not be ingested . c. If they are spilled on the skin, the area should be washed well with soap and water . 1 of 4 9/24/2009 7:14 PM CH102 Prelab 03 Solubility Rules http://www.webassign.net/v4cgismayor@ncsu/student.pl?m=200909242... 2. /4.16 points 1/3 submissions Notes Green checks and red X's are not displayed for this question. These questions concern waste disposal in the Solubility Rules lab. Select the correct response from each pull-down menu. a. All of the solutions prepared in this experiment should be d iscarded in the waste container on the bench. b. It's a good idea to have a labelled beaker in the work area to collect waste during the experiment. c. A squeeze bottle of deionized water can be used rinse the solutions into the beaker. d. Use the minimum amount of water possible, to avoid creating a large volume of waste solution. . 3. /4.16 points 2/3 checks submissions Notes Green and red X's are not displayed for this question. These questions concern the directions on how to do the Solubility Rules experiment. Choose the correct response from each pull-down menu. a. The instructions say to use three d rops of each test solution in the well plate. b. It probably is not a good idea to use more. c. If we can't clearly see a reaction in the well plate, we should repeat it in a small test tube . d. The dropper should not be allowed to touch the grid or solution already in the well . e. If the dropper does touch one of these, it can contaminate the reagent when it's returned to the bottle . 4. /4.16 points 2/3 submissions Notes Green checks and red X's are not displayed for this question. Choose the correct response from each list. 2 of 4 9/24/2009 7:14 PM CH102 Prelab 03 Solubility Rules http://www.webassign.net/v4cgismayor@ncsu/student.pl?m=200909242... a. Which of the following cations will you NOT be studying in the Solubility Rules experiment? Sr2+ Fe3+ Li1+ Al3+ NH41+ Mg2+ Ca2+ b. Which of the following anions will you NOT be studying in the Solubility Rules experiment? ClO41CO32O22Cl1OH1SO42PO43NO31- c. Which of the following is NOT true about a net ionic equation? Only ionic species which participate in the reaction are shown. Spectator ions are not shown in the equation. A gaseous product is indicated with its formula followed by (g). All ionic species in the reaction mixture are shown. A solid product (precipitate) is indicated with its formula followed by (s). A liquid product is indicated with its formula followed by (l). 5. /4.16 points 2/3 submissions Notes When ionic solids dissolve in water, they produce soluble aqueous cations and anions. For example, adding solids MgBr2 to water will produce ions according to the dissolution reaction below. MgBr2(s) Mg 2+(aq) + 2Br1-(aq) cation anion In this lab, you will be mixing two solutions containing soluble ions and observing any reactions that occur. Please write the dissolution reaction for each of the ionic solids below. Please enter all coefficien ts, even coefficients of 1. Instructions for inputting ions material state coefficient cation state coefficient anion state 3 of 4 9/24/2009 7:14 PM CH102 Prelab 03 Solubility Rules http://www.webassign.net/v4cgismayor@ncsu/student.pl?m=200909242... a)Al(NO3)3 b)Zn(NO3)2 c)Na3PO4 (s (s (s ) ) ) 1 1 3 Al^3+ Zn^2+ Na^1+ ( aq ( aq ( aq ) ) ) + + + 3 2 1 NO3^1NO3^1PO4^3- ( aq ( aq ( aq ) ) ) 6. /4.2 points 1/3 submissions Notes In the Solubility Rules lab, you will be doing chemical reactions and forming solid ionic compounds from their soluble ions. This question will give you practice in writing ionic compounds. Instructions for inputting chemical formulas Write the chemical formula of the neutral compound formed from the ions below. Ions a) Ag1+ ions and CrO42- ions b) Al3+ ions and OH1- ions c) Cu2+ ions and NO31- ions Ionic Compound Ag2CrO4 Al(OH)3 Cu(NO3)2 4 of 4 9/24/2009 7:14 PM

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