Collision Theory Recap

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

Tags

NGSS.HS-PS1-5

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

Tags

NGSS.HS-PS1-5

What is the purpose of a catalyst?

• Helps to slow down a reaction

• Replaces the products

• Helps to speed up a reaction

• Replaces the reactants

Tags

NGSS.HS-PS1-5

Increasing the temperature of your solution will.......

• Not affect the rate of reaction.

• Speed up the rate of reaction

• Slow down the rate of reaction

Tags

NGSS.HS-PS1-5

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

• Slow down the reaction

• Speed up the reaction

• Have no affect on the reaction

Tags

NGSS.HS-PS1-5

Which has more surface area?

• Large chunks of chalk

• Cube of sugar

• Powdered sugar

• Small chunks of sugar

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

Tags

NGSS.HS-PS1-5

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

Tags

NGSS.HS-PS1-5

More collisions correspond to a: 

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

Tags

NGSS.HS-PS1-5

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

• The reactants must lightly collide with enough energy in the correct orientation.

• The reactant particles must collide perpendicular to each other with high kinetic energy.

• The reactants must have low kinetic energy and in the correct orientation.