PS Quiz Collision Theory & Rates of Reactions

What factors affect reaction rate?

• size of atoms

• temperature

• concentration

• surface area

• catalysts

Tags

NGSS.HS-PS1-5

A log is burning in a campfire. If the concentration of oxygen reaching the log is increased, what will happen to the reaction rate?

• reaction rate decreases

• reaction rate increases

• reaction rate remains the same

Tags

NGSS.HS-PS1-5

What is necessary for a chemical reaction to occur?

• Correct orientation of particles when they collide

• particle collisions

• an increase or decrease in temperature

• particle collisions with sufficient energy

• a catalyst

A reactants temperature is increased. What happens?

• more collisions occur

• the same number of collisions occur

• greater collision energy

• less collision energy

• the same collision energy

Tags

NGSS.HS-PS1-5

the rate at which a chemical reaction takes place

• activation energy

• collision theory

• reaction rate

• chemical reactions

Tags

NGSS.HS-PS1-5

How could we make this reaction happen more quickly?

• Decrease the concentration of the acid

• crush the chalk to increase the surface area

• Put the test tube in an ice bath

Tags

NGSS.HS-PS1-5

Which has more surface area?

• Large chunks of chalk

• Cube of sugar

• Powdered sugar

• Small chunks of sugar

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants

• it lowers the activation energy

• it increases the energy of particle collisions

• it increases the frequency of particle collisions

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-PS1-5

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

• Red, because the activation energy is larger
• Blue, because the activation energy is lower
• both reaction progress at the same rate

Tags

NGSS.HS-PS1-4