Chem Test Unit 6 RETAKE

Chemistry Test Unit 6 - Chemical Kinetics

What must occur for particles to react?

1. correct alignment

2. sufficient speed

3. for the particles to collide

Which is a higher temperature: a higher or lower hill on a Maxwell-Boltzmann curve?

the lower hill

Which is a lower temperature: a higher or lower hill on a Maxwell-Boltzmann curve?

the higher hill

Why are the areas under each Maxwell-Boltzmann curve equal?

each curve contains the same amount of particles

What units is concentration measured in?

mol dm^-3

What units is rate measured in?

mol dm^-3 s^-1

What part of the Arrhenius equation has to do with the number and orientation of the collisions?

A (frequency factor)

What does the y-intercept of an Arrhenius plot tell you?

frequency factor

What does the slope of an Arrhenius plot tell you?

activation energy

What part of the Arrhenius equation has to do with the fraction of reactant particles that have sufficient energy to react?

e^(-Ea/RT) (exponential factor)

What does the x-axis of an Arrhenius plot tell you?

1/Temperature

What does the y-axis of an Arrhenius plot tell you?

natural log of rate constant

Factors that affect the rate of reaction

1. concentration

2. temperature

3. surface area

4. catalysts

When to measure reaction progress using mass or volume

when a gas is evolved

When to measure reaction progress using absorbtion

when there is a color change

When to measure reaction progress using pH

when there is a change in acidity

When to measure reaction progress using conductivity

when there is a change in ionic concentration

Increasing the concentration of reactions ______ the collisions per second.

increases

Why does increasing temperature increase the rate?

1. More collisions

2. More particles will possess the necessary activation energy

Increasing surface area ______ the rate.

increases