Question

(b) Is electronegativity intensive or extensive?

(c) Define Oxidation, Reduction, Oxidizing agent, Reducing agent.

(d) Explain SHE, standard hydrogen electrode.

(e) Using your own words, explain standard reduction potential.

(f) Summarize 5 steps involved in Half-Reaction method for balancing redox.

(g) Cr(s)/Cr⁺³(aq)//Ag⁺¹(aq)/Ag(s)   For this given shorthand cell notation, write the chemical equation showing what happens at anode, and at cathode. Then write the overall equation.

(h) Look up a Galvanic Cell set up with Zn and Cu. Sketch it here. Identify cathode and anode.

Answer 1

Ans. Electronegativity is intensive quantity as it doesnot depend on the size and number. It is fixed for each each element.

Ans.Oxidation = addition of oxygen or removal of hydrogen.

Reduction= addition of hydrogen or removal of oxygen.

Oxidizing agent = These can oxidized other and itself gets reduced, eg. KMnO4

Reducing agent = These can reduced other and itself gets oxidized. eg. LiAlH4

Ans.SHE = standard hydrogen electron, It is the emf that is correspond to the hydrogen cell

2H+ + 2e = H2(g) Eo = +V

Ans Standard reduction potential = It is series of electrochemical cell in which metal and non metals ions are reduced to corresponding species and that has a reference cell of standard hydrogen electrode.

eg. Zn2+ + 2e = Zn(s) Eo = -0.76V