Rate of Reaction

What is the meaning of "rate" in the rate of reaction?

• Speed

• Exchange

• Price

• Catalyst

A __________ collision is one where colliding particles have enough energy to react, i.e. have energy equal to or greater than the activation energy.

• unsuccessful

• reactive

• ineffective

• succesful

What is activation energy?

• The minimum energy needed to stop a reaction.

• The maximum energy needed to start a reaction.

• The minimum energy needed to start a reaction.

• The maximum energy needed to stop a reaction.

What are the factors that affect the rate of a reaction?

• Concentration

  Pressure

  Solvent type

  Temperature

• Concentration

  Pressure

  Particle size

  Temperature

• Volume

  Pressure

  Particle size

  Temperature

• Concentration

  Volume

  Particle size

  Temperature

When concentration is increased, the rate of reaction ​increases. Why is this?

• There are more particles in the same volume.

• The particles are moving faster.

• More particles have the activation energy.

• There are less particles in the same volume.

When concentration is decreased, the rate of a reaction ​decreases. Why is this?

• There are less particles per unit volume, resulting in less successful collisions.

• There are more particles per unit volume, resulting in a higher frequency of collisions.

• There are less particles per unit volume, resulting in a lower frequency of collisions.

• There are more particles per unit volume, resulting in more successful collisions.

Why does the rate of a reaction increase when pressure is increased?

• Particles are moving faster.

• The particles are closer together.

• There are more particles in the same volume.

• More particles have the activation energy.

Why does the rate of a reaction decrease when pressure is decreased?

• The particles are further apart.

• Less particles have the activation energy.

• Particles are moving slower.

• Less number of particles in the same volume.

An increase in temperature increases the rate of reaction because particles are ____(1)____, resulting in ____(2)____ .

• (1) closer together

  (2) a higher frequency of collisions

• (1) moving faster

  (2) a higher frequency of collisions

• (1) moving faster

  (2) less successful collisions

• (1) moving faster

  (2) more successful collisions

A decrease in temperature results in _________ in rate of reaction.

• an increase

• a decrease