Collision Theory and Reaction Rates

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

Tags

NGSS.HS-PS1-5

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

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

NGSS.HS-PS1-7

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

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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