CART Equilibrium and Reaction Rates 2

Question 1

Reaction rate is defined as the change in concentration of a reactant or product per unit of:

Accepted Answer

Time

Answer

Reaction rate measures how quickly concentration changes over time, expressed as Δ[concentration]/Δtime.

Question 2

Which of the following will increase the rate of most chemical reactions?

Accepted Answer

Increasing surface area of solid reactants

Answer

Increasing surface area exposes more reactant particles to collisions, increasing the frequency of effective collisions and the reaction rate.

Question 3

The activation energy of a reaction is the:

Accepted Answer

Minimum energy required for reactants to form products

Answer

Activation energy (Ea) is the minimum energy that colliding reactant molecules must have to successfully form products.

Question 4

According to collision theory, a reaction occurs when molecules collide with:

Accepted Answer

Sufficient energy and proper orientation

Answer

Collision theory requires both sufficient kinetic energy (≥ Ea) and the correct geometric orientation for a productive collision.

Question 5

In a reaction energy diagram, the activated complex (transition state) is found at the:

Accepted Answer

Highest point on the energy diagram

Answer

The transition state (activated complex) represents the highest energy arrangement of atoms during the reaction and sits at the peak of the energy diagram.

CART - Chemistry Acceleration Readiness Test Practice Test

CART - Chemistry Acceleration Readiness Test Practice Test

CART Equilibrium and Reaction Rates 2