#1. the arrangement of atoms at the peak of the activation energy barrier is known as the a. activation rate b. activated complex c. transition state d. both b and c #2. two opposing reactions (a + b c + d) occurring simultaneously at the same rate is an example of:
a. reversibility./b. chemical equilibrium./c. neither a nor b/d. both a and b
#3. a substance that interferes with the action of a catalyst is known as a(n)
a. negative inhibitor
/b. either an inhibitor or negative inhibitor /c. inhibitor /d. activated complex
#4. the reducing agent in the reaction described in fe + 2hcl → fecl2 + h2 is
a. fe./b. hcl./c. fecl2.

Answer :

1) The correct option is, (D) both B and C.

2) The correct option is, (D) both A and B

3) The correct option is, (C) inhibitor.

4) The correct option is, (A) Fe

Explanation :

For part 1 :

Activated complex or transition state : It is the state where the bonds are loosened and new lose bonds are formed between them. It is unstable state and immediately dissociates to form the stable products. The arrangement of atoms takes place at the peak of the activation energy barrier.

For part 2 :

The balanced chemical reaction is,

Chemical equilibrium : It is defined as a state where the rate of forward reaction is equal to the rate of backward reaction. That means there is no net change in the concentration of the reactants and the products.

Reversibility : It is defined as, in a reversible reaction when reactant A and B react to form products C and D and in the reverse reaction, C and D react to form A and B. That means process is reversible.

For part 3 :

Inhibitor : It is the substance that decreases the rate of the chemical reaction. It can reduce the effectiveness of the catalyst in a catalyzed reaction.

Or we can say that it is a substance that interferes with the action of a catalyst.

For part 4 :

The balanced redox reaction is :

The half oxidation-reduction reactions are:

Oxidation reaction :

Reduction reaction :

From this we conclude that the 'Fe' is the reducing agent that loses an electron to another chemical species in a redox chemical reaction and itself oxidized.

Hence, the reducing agent is, Fe