Question

consider the reaction and its energy diagram
2 a + 25 kcal/mol ↔ 2 b + c
true or false questions
1 the highest energy designated by the star * is called the transition state
2 the reactants and the products are electronically stable since they meet the octet and duet rules
3 the transition state is when bonds to be broken are half - broken, and bonds to be formed are half - formed
4 the octet and duet rules are met in the transition state
a. true b. false

Explanation:

Question 1

Step1: Recall Transition State Definition

The transition state is the highest - energy state along the reaction pathway, represented by the peak (star - marked) in the energy diagram.

Step2: Evaluate the Statement

Since the star marks the highest energy point which is the transition state by definition, the statement is true.

Step1: Recall Octet/Duet Rules

Reactants and products (stable species) usually satisfy the octet (8 valence electrons for most atoms) or duet (2 for H, He) rules, giving them electronic stability.

Step2: Evaluate the Statement

If reactants and products are stable chemical species, they are likely to meet octet/duet rules, so the statement is true.

Step1: Recall Transition State Bonding

In the transition state, bonds that will be broken are in the process of breaking (half - broken) and bonds that will be formed are in the process of forming (half - formed).

Step2: Evaluate the Statement

This matches the definition of the transition state's bonding situation, so the statement is true.

Answer:

A. true

Question 2