Reaction Rates

Increase in temperature of the reactants can do one of the following

• Slow collision frequency
• Allow less effective collision between the particles
• Cause particles to lose speed
• Increase collision between the particles thus increasing the rate.

Tags

NGSS.HS-PS1-5

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

What does a catalyst do to speed up a reaction?

• It reduces the surface area of the reactants

• It increases the surface area of the reactants.

• It reduces the required energy for a chemical reaction to occur and provides an alternative pathway.

• It increases the required energy for a chemical reaction to occur

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

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 because there are more collision sites

Tags

NGSS.HS-PS1-5

If the temperature is increased, then the rate is ........... and the time required for the reaction is  ............

• Increases, decreases

• Increases, increases

• decreases, increases

• decreases, decreases

Tags

NGSS.HS-PS1-5

A catalyst  ........... the rate of reaction by .......... the energy of activation.

• Decrease, increasing

• increase, increasing

• Increases, decreasing

Tags

NGSS.HS-PS1-4

Increasing the number of collisions between reactants causes the rate to.........  This happens by ...... the concentration or by  ......the temperature.

• Increases, increase, increase

• increases, decrease, decrease

• decreases, increase, increase

Tags

NGSS.HS-PS1-5

A reaction with very large energy of activation would be a  ( fast or slow ) reaction rate.

• slower

• fast

• neither

List four factors that affects the rate of a reaction

• temperature

• concentration

• surface area

• volume

• catalysts

Tags

NGSS.HS-PS1-5