Collision Theory and Reaction Energy Profiles

What is reaction rate?

A change in concentration per time

What is a change in concentration per time?

reaction rate

What is the activation energy?

The minimum energy required to make the reaction happen

What is the minimum energy required to make the reaction happen?

activation energy

What is an activated complex?

An unstable arrangement of atoms that forms momentarily

What is an unstable arrangement of atoms that forms momentarily?

An activated complex

What are the factors that affect reaction rates?

surface area, concentration, temperature, volume (of gases), and the presence of a catalyst

Surface area, concentration, temperature, volume (of gases, and the presence of a catalyst are the factors that affect what?

reaction rates

How does surface area affect reaction rates?

more surface area, more collisions, a faster reaction

_, more collisions, a faster reaction (1)

more surface area

How does the concentration of reactants affect the reaction rate?

Increased concentration, more collisions, and a faster reaction

_, more collisions, and a faster reaction (2)

increased concentration

How does temperature affect reaction rates?

increased temperature, faster particles, a faster reaction

_, faster particles, a faster reacion

increased temperature

What does increased temperature mean?

more collisions exceeding activation energy

What means more collisions exceeding activation energy?

increased temperature

How does volume (of gases) affect reaction rates?

Increased pressure/decreased volume = particles closer together, more collisions, a faster reaction

_ = particles closer together, more collisions, a faster reaction,

Increased pressure/ decreased volume of gases

What do catalysts do?

speed of reactions by lowering activation energy, and are not used up

What speeds up reactions by lowering activation energy, and are not used up?

catalysts