Collision theory and reaction rates

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

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

• increase, decrease

• increase, increase

• decrease, decrease

• decrease, increase

Tags

NGSS.HS-PS1-5

The collision theory qualitatively explains how chemical reactions occur and why reaction rates differ for different reactions

• 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

Collisions may take place between: 

• Atoms
• Ions
• Molecules
• All of the above

Tags

NGSS.HS-PS2-3

NGSS.HS-PS2-4

Which factors increase the rate of a reaction.

• increasing temperature
• increasing concentration
• increasing surface area
• all of these

Tags

NGSS.HS-PS1-5

Increase in temperature of the reactants can do one of the following

• Slow collision frequency
• Allow less effective collision between the particles
• Neutralise the reaction
• increase collision between the particles thus increasing the rate.

Tags

NGSS.HS-PS1-5

Why does a catalyst increase the rate of reaction?

• it produces extra energy for the reactants
• it increases the speed of the reactant particles
• it increases the frequency of particle collisions
• it reduces the activation energy of the reaction 

Tags

NGSS.HS-PS1-4

Which of the following increase the reaction rate?

• less surface area
• lower temperature
• an inhibitor
• increased concentration

Tags

NGSS.HS-PS1-5

Why don't all collisions between particles cause a reaction?

• the particles also need to collide with a catalyst
• not all the particles collide with enough energy
• not all the particles collide at a high enough temperature
• the particles need to collide with each other twice

Tags

NGSS.HS-PS1-5