In the reaction Zn + CuSO₄ → Cu + ZnSO₄

The given question is incomplete. The complete question is:

In the reaction , identify the oxidizing and reducing agent.

 reducing agent. : Zn

oxidizing agent :

Explanation:

Oxidation reaction : When there is an increase in oxidation state number.

Reduction reaction : when there is a decrease in oxidation state number.

Zinc metal has undergone oxidation, as its oxidation state is changing from 0 to 2+. Zinc metal is getting converted into zinc ions.

ions has undergone reduction, as its oxidation state is changing from +2  to 0. Copper ions are getting converted into copper metal.

The chemical agent which itself get oxidized and reduce others is called reducing agent.   is a reducing agent.

The chemical agent which itself get reduced and oxidize others is called oxidizing agent. is an oxidizing agent.

a) 2

b) 1/4

c) 9

Explanation:

a) for a first order reaction in reactant A

r initial = k*[A initial]

then if the concentration is doubled [A final ]= 2*[A initial]  , then

r final = k*[A final ] = 2* k*[A initial] = 2*r initial

then the velocity changes by a factor of 2

b) for a second order reaction in reactant B

r initial = k*[B initial]²

then if the concentration is halved: [B final ]= [B initial]/2  , then

r final = k*[B final ]²  = k*( [B initial]/2 )²  =k* [B initial]² /4 = r initial /4

then the velocity changes by a factor of 1/4

c) for a second order reaction in reactant C

r initial = k*[C initial]²

then if the concentration is tripled : [C final ]= 3* [C initial]  , then

r final = k*[C final ]²  = k*( 3*[C initial] )²  =k* [C initial]² *9 = 9 * r initial  

then the velocity changes by a factor of 9