Question

Consider the rate law below.

R=k[A]2

What effect does doubling the concentration have on the rate?

A. doubles the rate
B. triples the rate
C. quadruples the rate
D. no effect on the rate​

Answer 1

C. quadruples the rate

Further explanation

Given

The rate law :

R=k[A]²

Required

The rate

Solution

There are several factors that influence reaction kinetics :

• 1. Concentration
• 2. Surface area
• 3. Temperature
• 4. Catalyst
• 5. Pressure
• 6. Stirring

The rate is proportional to the concentration.

If the concentration increased, the reaction rate will increase

The reaction is second-order overall(The exponent is 2)

The concentration of A is doubled, the reaction rate will increase :

r = k[A]² ⇒ r= k[2A]²⇒r=4k[A]²

The reaction rate will quadruple.