Gr 11 Physical Sciences: Ch 10.3 Activation energy and the activated complex

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What is the minimum amount of energy required to start a chemical reaction?

Activation energy (correct)
Kinetic energy
Thermal energy
Potential energy

What happens to the bonds in the reactants in an exothermic reaction?

They break (correct)
They remain intact
They are strengthened
They are replaced

What is the term for the transient state where old bonds are breaking and new bonds are forming?

Activated complex (correct)
Reaction intermediate
Transition state
Energy state

What is the energy change in an exothermic reaction?

Energy is released (B) Signup and view all the answers

What is the energy diagram shape for an exothermic reaction?

Downward curve (B) Signup and view all the answers

In an endothermic reaction, what happens to the bonds in the reactants?

They break (B) Signup and view all the answers

What is the term for the initial energy input needed to break the bonds in the reactants?

Activation energy (B) Signup and view all the answers

What is the difference between exothermic and endothermic reactions?

Exothermic reactions release energy, while endothermic reactions absorb energy (D) Signup and view all the answers

What is the result of the reaction between O2 and N2?

Formation of NO (B) Signup and view all the answers

What is the sign of ∆H in an endothermic reaction?

Positive (A) Signup and view all the answers

What is the highest energy state in an endothermic reaction?

Activated Complex (D) Signup and view all the answers

What happens to the energy in an endothermic reaction?

Energy is absorbed (B) Signup and view all the answers

What is the purpose of the activation energy in a reaction?

To initiate the reaction (C) Signup and view all the answers

What is the activated complex in a reaction?

A transient structure during the reaction (B) Signup and view all the answers

What is the significance of the activation energy in an endothermic reaction?

It is the minimum energy required to initiate the reaction (A) Signup and view all the answers

What is the characteristic of the energy diagram for an endothermic reaction?

The energy increases from reactants to products (A) Signup and view all the answers

What happens to the bonds in the reactants during the formation of the activated complex?

They start to break and new bonds start to form (A) Signup and view all the answers

What is the purpose of the energy absorption in an endothermic reaction?

To increase the potential energy of the products (C) Signup and view all the answers

What is the difference between the reactants and products in terms of energy?

The reactants have lower energy than the products (C) Signup and view all the answers

What is the highest energy point in an endothermic reaction?

The activated complex (A) Signup and view all the answers

What is the role of activation energy in a chemical reaction?

To break the bonds in the reactants (B) Signup and view all the answers

Which stage of a reaction has the highest energy?

Activated complex (A) Signup and view all the answers

What is the relationship between activation energy and the reaction rate?

Less activation energy leads to a faster reaction rate (C) Signup and view all the answers

What is the significance of the energy diagram for an exothermic reaction?

It shows the energy decrease from reactants to products (B) Signup and view all the answers

What happens to the energy in an exothermic reaction?

It is released to the surroundings (B) Signup and view all the answers

What is the difference between the activated complex and the products?

The activated complex is a transient state where old bonds are breaking and new bonds are forming (B) Signup and view all the answers

What is the purpose of the energy diagram for a reaction?

To illustrate the energy changes during the reaction (D) Signup and view all the answers

What is the relationship between the activation energy and the reaction outcome?

Lower activation energy leads to a more favorable reaction outcome (D) Signup and view all the answers

What is the primary function of the activation energy in a chemical reaction?

To initiate the reaction by breaking the bonds in the reactants (C) Signup and view all the answers

Which of the following statements is true about the activated complex?

It represents the highest energy point in the reaction (C) Signup and view all the answers

What is the difference between the energy diagrams of exothermic and endothermic reactions?

The energy diagram for an exothermic reaction decreases in energy, while the energy diagram for an endothermic reaction increases in energy (B) Signup and view all the answers

What is the significance of the energy release in an exothermic reaction?

It indicates the formation of products (C) Signup and view all the answers

What is the primary reason for the formation of an activated complex?

To provide an intermediate state for bond reformation (B) Signup and view all the answers

Which stage of a reaction has the lowest energy?

The products (C) Signup and view all the answers

Which of the following statements about endothermic reactions is true?

The reactants have higher potential energy than the products (C) Signup and view all the answers

What can be inferred about the energy diagram for an endothermic reaction?

It has a local maximum at the activated complex (D) Signup and view all the answers

What is the relationship between the activation energy and the reaction rate?

An increase in activation energy decreases the reaction rate (C) Signup and view all the answers

What is the significance of the activated complex in a reaction?

It is the point of highest energy in the reaction (D) Signup and view all the answers

What is the purpose of the energy diagram in a chemical reaction?

To visualize the energy changes during the reaction (C) Signup and view all the answers

Which of the following is true about the bonds in the reactants during an endothermic reaction?

The bonds break and absorb energy (A) Signup and view all the answers

What is the role of energy absorption in an endothermic reaction?

To increase the potential energy of the products (D) Signup and view all the answers

What can be inferred about the reactants and products in an endothermic reaction?

The reactants have lower potential energy than the products (D) Signup and view all the answers