Worksheet 4.3\"Redox Rxns, Soln Conc&Soln; Stoi Goal: Determine Ox #s and use Ac

Question

Worksheet 4.3"Redox Rxns, Soln Conc&Soln; Stoi Goal: Determine Ox #s and use Activity Series. Determine Solution concentration and use Solution Stoichiometry I. 2. Why: To understand Redox reactions students need to be able to assign Ox its and use the Activity table solution to predict if Redox reactions will occur. Students must be able to work with aqueous s concentration during dilution and in aqueous chemical reactions via aqueous stoichiometry Part A: Determine the Ox # of the desired element What is theoxidation number of nitrogen in the NFL. cation? (hint nonmetals?) 1. what is the ox # of H with 2. What is the oxidation number of nitrogen in the NO, anion? 3. What is the oxidation number of sulfur in the compound H SO,? Part B: Using the Activity Series predict the product of the reaction & balance the equation (if no reaction write NR on product side) Oxidation Reaction Lithium Potassium KO)-K 4, 5. 6, 7, Cu (s) + HCl (aq) HCl (aq) + Mg (s) Zn (s) + AgNO3 (aq) Al (s) + Cu(NO3)2 (aq) Aluminium AMs) Chromium Cr(s) Cr'ar)+3e Nickel Part C: Calculate the concentration or desired amount for each of the following 8. Calculate the molarity of 750. mL of solution containing 75.0 g of CH.OH 9Calculate the number of liters necessary to contain 2.1l mol of 0.988 M CHO

Explanation / Answer

Part A)

1) Oxidation # of H with non-metals like Nitrogen =+1

Let the Ox # of N be x

In NH4+ , balancing the net charge of the ion

x+(+1)*4=+1=x+4=1

x=1-4=-3

x=-3

2) Let the Ox # of N be y in NO3-

Ox # of O =-2

In NO3- ,

x+3*(-2)=-1

x-6=-1

x=+5

3) Let the Ox # of S be z in H2SO4

So, 2*(+1)+x+4*(-2)=0

2+x-8=0

or , x-6=0

x=+6

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