1.2 Collision theory

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?

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

• The energy required to break a bond.

• The time it takes for a reaction to occur.

• Collision Theory

Decreasing the concentration of a substance will usually........

• Slow down the reaction

• Speed up the reaction

• Have no affect on the reaction

If you shrink the container size that your gas substance is in what will happen?

• The reaction rate will stay the same

• The reaction rate will speed up

• The reaction rate will slow down

With the increase in temperature, the average kinetic energy of the molecules increases, leading to a decrease in number of collisions per unit time.

• True
• False

The collisions which bring about a chemical reaction are called: 

• Consistent collisions
•  Normal collisions 
• Effective collisions 
• None of the above

More collisions correspond to a: 

• Faster reaction rate  
• Slower reaction rate
• Constant reaction rate 
• None of the above

What criteria must be met for reactant collisions to result in a successful product?

• The reactants must collide with each other

• The reactants must collide with enough energy and be in the right positions

• The reactants must have enough energy to form the activated complex

Which of the following is/are the fundamental idea(s) of collision theory?

• Molecules react by colliding together
• The effective collisions must occur with certain minimum amounts of energy 
• In a large sample, the greater the number of effective collisions, and the faster the rate of reaction
• All of the above

Under the collision theory, the particles must collide ____ and ____ for a reaction to occur.

• sufficient rate and sufficient energy
• sufficient surface area and correct orientation
• sufficient catalyst and sufficient energy
• sufficent energy and correct orientation