Reaction Rates and Activation Energy

Which of the following is a possible unit for rate of reaction?

• cm³/s

• m/s

• N

Tags

NGSS.HS-PS1-5

Which of the following would speed up a reaction?

• Using lumps instead of powder

• Increasing the concentration of an acid

• Decreasing the temperature

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

Which of the following will increase the frequency of successful collisions?

• Increasing the temperature

• Decreasing the pressure

• Decreasing the concentration

Tags

NGSS.HS-PS1-5

Which of the following statements about catalysts is false?

• They speed up reactions

• They provide an alternative reaction pathway with a lower activation energy

• They become chemically changed at the end of the reaction

Tags

NGSS.HS-PS1-4

Which of the following will increase the proportion of successful collisions?

• Increasing the temperature

• Increasing the pressure

• Increasing the concentration

Tags

NGSS.HS-PS1-5

Which of the following would give a steeper curve on a graph of volume of gas against time?

• Low temperature

• Low concentration

• Using a catalyst

Tags

NGSS.HS-PS1-5

What effect on the equilibrium position is produced by adding a catalyst to a system in equilibrium?

• It decreases the yield of product

• It increases the yield of products

• It has no effect

What substance speeds up the reaction rate by lowering the activation energy needed to start the reaction?

• Concentration

• Catalysts

• Pressure

• Temperature

Match the following Reaction Rate affect with the definition of why it speeds up reactions.

• Surface Area

• The more of this causes there to be more room for the particles to collide and react with one another

• Pressure

• Higher amounts of this of this leads to more frequent collisions between reactant particles

• Temperature

• This substance speeds the reaction rate by lowering the activation energy needed to start the reactions

• Catalyst

• The higher the ____ = the smaller of the volume, causing more particle collisions

• Concentration

• The higher the ______, the faster the reaction because more particles are moving and colliding, thus contacting with each other to react.

Tags

NGSS.HS-PS1-5

How quickly a reaction will take place is called what?

• Reaction Rate

• Temperature

• Catalyst

• Pressure

Tags

NGSS.HS-PS1-5