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

More collisions correspond to a: 

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

Tags

NGSS.HS-PS1-5

Reaction rate means...

• amount of product formed
• speed of reaction
• concentration of reacting particles
• combining reactants with products

Tags

NGSS.HS-PS1-5

To slow down a chemical reaction you will do one of the following:

• Place the reactants in hot water
• Place the products in ice bath
• Place the reactants in a ice bath
• Keep stirring the reactants with a stirring rod

Tags

NGSS.HS-PS1-5

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

If the concentration of a reactant is increased, the reaction rate will ___________.

• increase

• decrease

• stay the same

Tags

NGSS.HS-PS1-5

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

• True
• False

Tags

NGSS.HS-PS1-5

The collisions which bring about a chemical reaction are called: 

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

Increasing the concentration increases the speed of reaction by

• lowering activation energy
• increasing collisions
• speeding up the reactants
• exposing more reactant

Tags

NGSS.HS-PS1-5

The minimum amount of energy needed for colliding particles to react is called

• Chemical Energy

• Kinetic Energy

• Activation Energy

• Potential Energy

Tags

NGSS.HS-PS1-4