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Factors Influencing Rate of a Reaction

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Estimated time: 2 minutes
CBSE: Class 12

Key Points: Factors Influencing Rate of Reaction

The rate of a reaction depends on:

Factor Effect on Rate
Concentration of reactants Higher conc. → more collisions → higher rate
Temperature Higher T → more energetic collisions → higher rate
Physical state and surface area Greater surface area → higher rate
Catalyst Lowers activation energy → higher rate
Pressure (gaseous reactions) Higher pressure → higher rate
Light / electromagnetic radiation Provides energy for photochemical reactions

Shaalaa.com | Chemical Kinetics part 5 (Factors impacting rate of reaction)

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Chemical Kinetics part 5 (Factors impacting rate of reaction) [00:14:01]
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Series: Factors Influencing Rate of a Reaction
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Chemical Kinetics part 5 (Factors impacting rate of reaction)
00:14:01  undefined
Chemical Kinetics part 6 (Reaction rate :Concentration)
00:19:18  undefined
Factors that affect Reaction Rate
00:10:39  undefined
Chemical Kinetics part 7 (Order of reaction)
00:12:50  undefined
Molecularity & order of reaction
00:12:42  undefined
Chemical Kinetics part 8 (Unit of rate constant)
00:13:16  undefined
Chemical Kinetics part 11 (Molecularity of reaction)
00:10:19  undefined
Rate Laws, Rate Constants, Reaction Order
00:08:58  undefined
Chemical Kinetics part 12 (Molecularity and order of reaction)
00:12:41  undefined
Chemical Kinetics part 17 (Determine rate constant,order of reaction)
00:10:43  undefined
Chemical Kinetics part 18 (Numerical)
00:13:29  undefined
Chemical Kinetics part 19 (Numerical)
00:13:23  undefined
Chemical Kinetics part 20 (Numerical)
00:09:26  undefined

Related QuestionsVIEW ALL [67]

Why does the rate of any reaction generally decreases during the course of the reaction?

Read the following passage and answer the questions that follow:

The rate of reaction is concerned with decrease in the concentration of reactants or increase in the concentration of products per unit of time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. A number of factors such as temperature, concentration of reactants, catalyst affect the rate of reaction. Mathematical representation of rate of a reaction is given by rate law:

Rate = k[A]x [B]y

x and y indicate how sensitive the rate is to change in concentration of A and B. Sum of x + y gives the overall order of a reaction.
When a sequence of elementary reactions gives us the products, the reaction is called complex reaction. Molecularity and order of an elementary reaction are same. Zero-order reactions are relatively uncommon but they occur under special conditions. All natural and artificial radioactive decay of unstable nuclei takes place by first-order kinetics.
  1. What is the effect of temperature on the rate constant of a reason?    [1]
  2. For a reaction \[\ce{A + B → Product}\], the rate law is given by, Rate = k[A]2 [B]1/2. What is the order of the reaction?    [1]
  3. How order and molecularity are different for complex reactions?    [1]
  4. A first-order reaction has a rate constant 2 × 10–3 s–1. How long will 6 g of this reactant take to reduce to 2 g?    [2]
    OR
    The half-life for radioactive decay of 14C is 6930 years. An archaeological artifact containing wood had only 75% of the 14C found in a living tree. Find the age of the sample.
    [log 4 = 0.6021, log 3 = 0.4771, log 2 = 0.3010, log 10 = 1]    [2]

Identify the order of reaction from the following unit for its rate constant:

L mol–1 s–1

The decomposition of N2O5(g) at 320K according to the following equation follows first order reaction:

`N_2O_(5(g))->2NO_(2(g))+1/2O_(2(g))`

The initial concentration of N2O5(g) is 1.24 x 10-2 mol. L-1 and after 60 minutes 0.20x10-2 molL-1. Calculate the rate constant of the reaction at 320K.

For a reaction R ---> P, half-life (t1/2) is observed to be independent of the initial concentration of reactants. What is the order of reaction?

A reaction is second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is reduced to half?

In a reaction if the concentration of reactant A is tripled, the rate of reaction becomes twenty seven times. What is the order of the reaction?

The conversion of molecules X to Y follows second order kinetics. If concentration of X is increased to three times how will it affect the rate of formation of Y?

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