Chemical Kinetics Test

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Chemical Kinetics Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

The value of energy of activation for radioactive decay is:

A
high

B
low

C
almost zero

D
moderate

Solution

All radio active decay are the first-order reaction for that activation energy is almost zero.

i.e. $$\Delta H=0$$
Question 2
1 / -0

Chemical kinetics a branch of physical chemistry deals with:

A
structure of molecules

B
heat changes in a reaction

C
physical changes in a reaction

D
rate of reactions

Solution

Chemical kinetics is branch of physical chemistry that is concerned with understanding the rates of chemical reactions.

Structures and physical changes are deal in solid state and while studying liquids.

Thermochemistry deals with energy changes in chemical reactions.
Question 3
1 / -0

Half life period of $$C^{14}$$ in years is:

A
$$500$$

B
$$5000$$

C
$$50$$

D
$$5\times 10^4$$

Solution

The half-period of $$C^{14}$$ is 5000 years. It is used in the determination of age of fossils by using technique called carbon dating.
Question 4
1 / -0

The excess of energy required for the reactant molecules to undergo a reaction is:

A
Potential energy

B
Kinetic energy

C
Thermal energy

D
Activation energy

Solution

Activation energy is the minimum energy required to initiate the chemical reaction.
So if reactant A does not have minimum energy to undergo a reaction then product B will not form.
Question 5
1 / -0

The following figure denotes the energy diagram for a reaction.
Then the activation energy for the reverse reaction is:

A
2x

B
2y

C
x+ y

D
y-x

Solution

Activation energy for reverse reaction will be:
X + Y
Question 6
1 / -0

For producing the effective collisions, the colliding molecules must posses:

A
a certain minimum amount of energy

B
energy equal to greater than threshold energy

C
proper geometry

D
threshold energy and proper orientation

Solution

For a reaction to occur the reactants particles must collide. However only a certain fraction of the total collisions are successful to cause a chemical change. The effective collisions must posses
a) Energy should be $$\ge $$ threshold energy
b) Molecule should have proper orientation.
Question 7
1 / -0

Reactants molecule must gain a minimum amount of energy called the _____________ before they can transform into product molecules.

A
activation energy

B
reaction energy

C
equilibrium energy

D
none of the above

Solution

The minimum energy required to start a reaction is called activation energy.
Question 8
1 / -0

Which of the following is not a first order reaction?

A
Decomposition of $$H_{2}O_{2}$$

B
Decomposition of $$N_{2}O_{5}$$

C
Decomposition of $$N_{2}O$$

D
Decomposition of $$SO_{2}Cl_{2}$$

Solution

$$2N_2 O \rightarrow 6N_2 O_y$$
second order
[c]
Question 9
1 / -0

Which increases average kinetic energy?

A
An increase in the reaction concentration

B
An increase in temperature

C
A decrease in pressure

D
Catalysis

E
$$\displaystyle pH$$

Solution

Increasing the temperature of a system increases the average kinetic energy of its constituent particles. As the average kinetic energy increases, the particles move faster and collide more frequently per unit time and possess greater energy when they collide. Both of these factors increase the reaction rate.
Question 10
1 / -0

What is activation energy?

A
It is the minimum amount of energy it takes to start a chemical reaction.

B
It is the maximum amount of energy it takes to start a chemical reaction.

C
It is the intermediate compound in a chemical reaction.

D
It is the energy needed for an exothermic reaction.

E
It is the energy needed for an endothermic reaction.

Solution

Activation Energy:- The minimum energy which must be available to a chemical system with potential reactants to result in a chemical reaction

Activation energy may also be defined as the minimum energy required to start a chemical reaction. The activation energy of a reaction is usually denoted by Ea and given in units of kilojoules per mole $$(kJ/mol)$$ or kilocalories per mole $$(kcal/mol).$$

So option A

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Chemical Kinetics Test - 15

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Chemical Kinetics Test - 15

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SHARING IS CARING

Question 1

high

low

almost zero

moderate

Solution

Question 2

structure of molecules

heat changes in a reaction

physical changes in a reaction

rate of reactions

Solution

Question 3

$$500$$

$$5000$$

$$50$$

$$5\times 10^4$$

Solution

Question 4

Potential energy

Kinetic energy

Thermal energy

Activation energy

Solution

Question 5

2x

2y

x+ y

y-x

Solution

Question 6

a certain minimum amount of energy

energy equal to greater than threshold energy

proper geometry

threshold energy and proper orientation

Solution

Question 7

activation energy

reaction energy

equilibrium energy

none of the above

Solution

Question 8

Decomposition of $$H_{2}O_{2}$$

Decomposition of $$N_{2}O_{5}$$

Decomposition of $$N_{2}O$$

Decomposition of $$SO_{2}Cl_{2}$$

Solution

Question 9

An increase in the reaction concentration

An increase in temperature

A decrease in pressure

Catalysis

$$\displaystyle pH$$

Solution

Question 10

It is the minimum amount of energy it takes to start a chemical reaction.

It is the maximum amount of energy it takes to start a chemical reaction.

It is the intermediate compound in a chemical reaction.

It is the energy needed for an exothermic reaction.

It is the energy needed for an endothermic reaction.

Solution

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