Chemistry Chapter 14 Quiz

Under the collision theory, the particles must collide with  ____ 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

Which of the following is NOT a factor affecting reaction rate?

• temperature
• catalysts
• particle size
• polarity

Tags

NGSS.HS-PS1-5

Adding a catalyst to a chemical reaction changes the rate of reaction by causing

• a decrease in the activation energy
• an increase in the activation energy
• a decrease in the heat of reaction
• an increase in the heat of reaction

Decreasing the particle size increases the reaction rate because

• It makes particles move faster

• It increases the likelihood of collisions with the correct geometry

• It decreases the surface area available to react

• It increases the surface area of the reactants thus more particles collides with each other therefore increase the frequency of effective collisions

Why does a higher temperature increase the rate of a reaction?

• it increases both the frequency and energy of particle collisions
• it only increases the frequency of particle collisions
• it only increases the energy of particle collisions
• it reduces the activation energy of the reaction

Tags

NGSS.HS-PS1-5

Products will form faster if____________

• the particle size of the reactants are larger.
• temperature is decreased.
• concentration of the reactants are increased.
• the reaction is not stirred.

Tags

NGSS.HS-PS1-5

Decreasing the particle size increases the reaction rate because

• It makes particles move faster
• It increases the likelihood of collisions with the correct geometry
• It decreases the surface area available to react
• It increases the number of collisions

A catalyst  

• is added to a reaction to make it slow down 
• breaks apart and is changed 
• provides an energetic short cut to the products 

Tags

NGSS.HS-PS1-5

The transitional structure between reactants and products is called...

• catalyst

• reaction rate

• activation energy

• activated complex

Any substance that changes a reaction rate without being permanently changed or consumed is called an

• activated complex

• enzyme

• catalyst

• inhibitor