AP Chemistry Thou Shalt 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

___________ are produced in one step and used up in a later step and __________________ are present and unchanged in the reactants and the products

• intermediates, catalysts

• catalysts, intermediates

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 the rate law for the reaction with this slow elementary step? A + 2B --> D + C

• rate = k[A]²

• rate = k[A][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

Which curve in this Maxwell-Boltzmann distribution represents the highest proportion of particles moving the fastest (# of particles vs. speed)?

• Black (peak on the left)

• Red (peak in the middle)

• Blue (peak on the right)

• All particles are moving at the same speed

Tags

NGSS.HS-PS3-2

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