Collision Theory & Reaction Rates

Suppose you held a lighted match to a solid hunk of wood and another match to a pile of wood shavings. Which form of wood will catch fire more easily?

• Wood shavings because of larger surface area.

• Wood chunk because of smaller surface area

• Wood chunk because of larger surface area.

• Wood shavings because of smaller surface area.

What is collision theory?

• Molecules must collide in the correct orientation with enough energy to bond.

• Molecules need enough energy to collide and react.

• Atoms constantly collide and react.

• The minimum energy needed for atoms to react

What is the rate of reaction?

• The time it takes for a reaction to occur.

• How much energy is needed for a reaction to occur.

• The energy required to break a bond.

• Collision Theory

What factors affect rate of reaction?

• Temperature, Pressure, Concentration and Surface area

• Temperature, Concentration, Pressure and Energy

• Surface Area, Concentration, Energy and Pressure

• Pressure, Surface area, Density and Energy

The minimum amount of energy that reacting (colliding) particles need to react is called_________ _________.

• activation energy

• colliding energy

• kinetic energy

• maximum energy

As a reaction proceeds, the concentration of reactants will _______ and the concentration of products will ________.

• decrease, increase

• increase, decrease

• increase, increase

• decrease, decrease

A reactants temperature is increased. What happens?

• more collisions occur

• the same number of collisions occur

• greater collision energy

• less collision energy

• the same collision energy

A reactants concentration is increased. What happens?

• more collisions occur

• the same number of collisions occur

• greater collision energy

• less collision energy

• the same collision energy

What happens to reaction rate when temperature is decreased?

• it increases

• it decreases

• it stays the same.

The higher the temperature a substance has the

• more energy it has

• less energy it has