REACTION KINETICS

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 

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

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

In the chemical reaction, the successful formation of products depends on the following factors EXCEPT:

• The collisions between reacting molecules must be effective

• The colliding molecules must approach each other in the right orientation

• The energy of colliding molecules must be equal to or more than activation energy

• A collision between molecules must produce sufficient energy to overcome the activation energy

Tags

NGSS.HS-PS1-5

The catalyst alters the rate of a chemical reaction by,

• providing an alternative pathway with a lower Ea

• changing the products formed in the direction of the reaction

• providing a surface on which the molecules react

• increasing the frequencies of collisions between molecules

Tags

NGSS.HS-PS1-4

The ____________ states that atoms, ions, or molecules must collide in order to react.

• transition state

• activation energy

• rate law

• collision theory

A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 

• catalyst
• product
• reactant
• solute

Tags

NGSS.HS-PS1-5

Increasing the temperature will increase the kinetic energy of particles, therefore increasing the collisions between particles.

• false
• true

Tags

NGSS.HS-PS1-5

Liz observes 2 reactions, A and B.

Reaction A is performed in a beaker placed on top of a hotplate.

Reaction B is is performed in a beaker placed within a container of ice.

Which of the following statements is true?

• Reaction A will react slower because the higher temperature will cause more collisions because the heat makes the molecules tired.

• Reaction A will react slower because the higher temperature will cause give the reactants higher speed and kinetic energy.

• Reaction B will react faster because the lower temperature causes the particles to move slower, allowing them to have more time to attach to one another.

• Reaction B will react slower because the lower temperature makes the particles move slower, resulting in less collisions.

Tags

NGSS.HS-PS1-5