NAME Zauf Alm DATE SECTION Experiment 5 ELECTRON TRANSFER REACTIONS PRELIMINARY QUESTIONS 1. Define: a. ion - An atom or molecule with a net change due to the loss or gain of one or more electrons. b. filtrate A liquid which has passed through a filter 2. Distinguish between a qualitative and a quantitative chemical test. Qualitive test is when you observe the changes ay quantitive test is when you measure quantities 3. Why is it less effective to wash an insoluble precipitate with 15 ml of water once than it is to wash the precipitate with 3 ml of water 5 times? Wash Insoluble precipitate with 15 ml of water once won't get rid of the precipitate fully insted washing multiple times would allow it to be fully clean 4. How many grams of copper metal are present in a 4.15 g sample of copper(II) fluoride dihydrate (CuF2:2H2O)? Molar mass of Cuf2.2H2O =157.5g/mul molar mas of copper = 63.55g/mo' 4,15g, 63.55g/mol 157.59/md 1 mol => 0.166 moles 0.166 . 63.55 = 10.549 75 Scanned with CamScanner
5. a.Write a balanced molecular equation for the reaction of aluminum metal with a solution of copper(II) chloride. ZA1+ 13 CUCI2, 2HED = 2AICI3+3CU +6H2O b.Based on the balanced equation in Question 5a, how many grams of copper(II) chloride dihydrat would be required to react completely with 1.20 g of aluminum metal? Mole of 1 1.20 26.18 = 0.0455 ml X/ = 0.0667m Molecular mass of copper (11) Chloride dinydate =170.48g/mol 0.0667x170.48 = 11.37g of copper (11) chloride dihydrate Scanned with CamScanner