Activation Energy and Molecular Collisions in Chemical Reactions

Mr. Anderson explains activation energy in chemistry, using a ball analogy to illustrate how energy is required to initiate chemical reactions. He discusses the role of molecule collisions, the importance of proper energy and orientation, and how temperature affects reaction rates. The Maxwell Boltzmann distribution is used to explain energy distribution among particles, showing how increased temperature shifts the distribution, allowing more particles to have sufficient energy for reactions.

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

• It is the energy stored in the products.

• It is the energy lost as heat.

• It is the energy required to start a reaction.

• It is the energy released during a reaction.

In an endergonic reaction, what happens if there is not enough activation energy?

• The reaction does not occur.

• The reaction becomes exergonic.

• The reaction proceeds slowly.

• The reaction releases energy.

What is a key factor that affects the success of molecular collisions in chemical reactions?

• The color of the molecules

• The orientation and energy of the molecules

• The size of the molecules

• The shape of the container

Which type of reaction involves interactions between a molecule and the solvent?

• Quadrimolecular

• Termolecular

• Bimolecular

• Unimolecular

What is the effect of firing molecules off-center in a collision?

• It has no effect on the reaction.

• It changes the products formed.

• It decreases the reaction rate.

• It increases the reaction rate.

How does temperature influence the Maxwell-Boltzmann distribution?

• It shifts the distribution to the left.

• It decreases the number of particles.

• It increases the number of particles with higher energy.

• It changes the shape of the particles.

What does the area under the Maxwell-Boltzmann curve represent?

• The total energy in the system

• The number of molecules with potential to react

• The speed of the reaction

• The temperature of the system

What happens to the activation energy when the temperature is increased?

• It decreases.

• It increases.

• It remains the same.

• It becomes zero.

What does the mode of the Maxwell-Boltzmann curve indicate?

• The most common energy level of particles

• The average energy of particles

• The lowest energy level of particles

• The highest energy level of particles

What is the relationship between temperature and the number of successful collisions?

• Temperature only affects unsuccessful collisions.

• Temperature has no effect on collisions.

• Higher temperature increases successful collisions.

• Higher temperature decreases successful collisions.