Energy Distribution Curves and Activation Energy

The video tutorial explains energy distribution curves, focusing on the axes representing energy and the number of molecules. It discusses activation energy, showing how molecules with energy above this threshold lead to successful reactions. The role of catalysts in lowering activation energy is highlighted, increasing the number of molecules capable of successful collisions. The tutorial also compares energy distributions at different temperatures, illustrating how higher temperatures result in more molecules exceeding the activation energy, thus increasing reaction rates.

What does the X-axis represent in an energy distribution curve?

• Energy

• Number of molecules

• Reaction rate

• Temperature

What does the Y-axis represent in an energy distribution curve?

• Temperature

• Reaction rate

• Number of molecules

• Energy

What is the significance of the activation energy on an energy distribution curve?

• It represents the average energy of all molecules.

• It is the energy level above which molecules can successfully collide.

• It shows the total number of molecules in the reaction.

• It indicates the temperature of the reaction.

How does a catalyst affect the activation energy in a reaction?

• It increases the activation energy.

• It decreases the activation energy.

• It has no effect on the activation energy.

• It doubles the activation energy.

What happens to the activation energy when a catalyst is added?

• It moves to the right on the energy distribution curve.

• It remains unchanged.

• It disappears from the curve.

• It moves to the left on the energy distribution curve.

In an energy distribution curve, what does a higher number of molecules above the activation energy indicate?

• A lower reaction rate

• A higher reaction rate

• A decrease in temperature

• An increase in pressure

Which reaction is likely at a higher temperature, A or B, if B has more molecules above the activation energy?

• Reaction B

• Reaction A

• Cannot be determined

• Both have the same temperature

What is the effect of temperature on the energy distribution curve?

• It shifts the curve to the left.

• It shifts the curve to the right.

• It flattens the curve.

• It has no effect on the curve.

How does the energy distribution curve change with an increase in temperature?

• The curve becomes narrower.

• The peak of the curve becomes lower.

• The curve becomes wider.

• The peak of the curve becomes higher.

What can be inferred if a reaction has fewer molecules above the activation energy?

• The reaction rate is unaffected.

• The reaction rate is higher.

• The reaction is at a lower temperature.

• The reaction is at a higher temperature.