AP Chemistry Reactions

___________ 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

If a “reaction profile” has a taller ‘hill’ (or activation energy) then the reaction is ____________________?

• Faster

• Slower

Tags

NGSS.HS-PS1-5

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

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

Tags

NGSS.HS-PS1-6

At equilibrium, concentrations of reactants and products are

• equal

• constant

Tags

NGSS.HS-PS1-6

The equilibrium constant expression, Kc, given aA + bB ⇄ cC + dD, is...

Tags

NGSS.HS-PS1-7