AP Chemistry Thou Shall Not Forget

What is the unit for the rate constant (k) for 2^nd order reactions?

• s^-1

• M/s

• M^-1s^-1

Tags

NGSS.HS-PS1-5

How does a catalyst speed up a reaction?

• Adding more reactant

• Providing a pathway that has a lower activation energy

• Increasing the activation energy

• Increasing binding energy

Tags

NGSS.HS-PS1-4

What are the 2 characteristics that an effective collision must have? SELECT TWO

• Enough energy to overcome E_a

• Molecules in the correct orientations

• High enough temperature

• Apporpriate intermediates present

What is the rate law for the reaction with this slow elementary step? A --> B + C

• rate = k[A]²

• rate = k[B]²

• rate = k[A][B]

• rate = k[A]

Tags

NGSS.HS-PS1-5

What is NOT a way to speed up a reaction

• Add a catalyst

• Decrease the volume

• Increase the concentration of reactants

• Increase surface area of the solid

• Decrease the pressure

Tags

NGSS.HS-PS1-5

Which curve represents the most particles in this Maxwell-Boltzmann curve (# of particles vs. speed)?

• Black (peak on the left)

• Red (peak in the middle)

• Blue (peak on the right)

• They all have the same number of particles

What order of reaction has a half-life that does not change regardless of the initial concentration?

• Zero

• First

• Second

• Third

At equilibrium, rates of the forward and reverse reaction are...

• The same

• Not the same

Tags

NGSS.HS-PS1-6

A system at equilibrium

• Must have reactants and products

• Must have products only

• Must have reactants only

At equilibrium, concentrations of reactants and products are

• equal

• constant