Reversible Reactions and Equilibrium

WHY is equilibrium called a dynamic state?

• The rate of reaction is fast

• The forward and backward reactions continue to take place once equilibrium is established.

• The concentrations of the reactants and products are the same

• All chemical reactions are considered to be reversible under suitable conditions.

What is the purpose of a catalyst on an equilibrium reaction?

• to increase the rate of forward reaction

• to increase rate of backward reaction

• in increase both forward and backward reaction rates

• no effect

Tags

NGSS.HS-PS1-6

At equilibrium, __________.

• all chemical reactions have ceased

• the rates of the forward and reverse reactions are equal

• the rate constants of the forward and reverse reactions are equal

• the value of the equilibrium constant is 1

• ) the limiting reagent has been consumed

Tags

NGSS.HS-PS1-7

Which is the reactant and why?

• it's concentration is decreasing

• it's concentration is increasing

• it's concentration is decreasing

• it's concentration is increasing

Tags

NGSS.HS-PS1-5

Which of the following is incorrect? 
A dynamic equilibrium can be achieved...

• From 100% reactants

• From 100% products

• In a closed system

• In an open system

The forward reaction forms the substance __________.

• AB

• B

• A + B

• A

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

At what time is dynamic equilibrium established?

• 1 second

• 5 seconds

• 8 seconds

• 10 seconds

At what time on the graph will the reaction reach equilibrium?

• t₁

• t₂

• t₃

• t₄

Tags

NGSS.HS-PS1-5

For the reaction...
SO_2(g) + O_2(g) <−>  SO_3(g)
If the concentration of SO_2(g)  is increased, the equilibrium of the reaction will ___________.

• shift to the left

• shift to the right

• not shift

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

For the reaction...
SO_2(g) + O_2(g) <−>  SO_3(g)
If the equilibrium shifts to the right, the concentration of O_2(g) will ___________.

• increase

• decrease

• remain the same

Tags

NGSS.HS-PS1-6