G12STS Assessment on 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

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

If the reactant particles collide with less than the activation energy, the particles will be rebound, and no reaction will occur.

• True
• False

What two factors govern whether a collision between reacting particles will be effective?

• orientation and potential energy 
• kinetic energy and temperature 
• kinetic energy and orientation 
• potential energy and kinetic energy 

The graph shows how the total volume of a gas given off from a reaction changes with time. In which time interval is least gas given off?

• A

• B

• C

• D

A student investigated the rate of reaction of calcium carbonate with dilute hydrochloric acid. Every minute, the student recorded the total volume of carbon dioxide produced, until some time after the reaction was complete.

Which graph shows the correct results?

• A

• B

• C

• D