Le Chatelier's Principle

Which is NOT a way to stress a closed chemical system at equilibrium?

• change temperature

• add a reactant

• take away a chemical in the reaction

• add a catalyst

Tags

NGSS.HS-PS1-6

When a catalyst is added to a system at equilibrium, which statement is NOT true?

• the rate of the forward reaction increases

• the rate of the reverse reaction increases

• a new equilibrium is reached

• no change is observed

Tags

NGSS.HS-PS1-6

If I add a chemical to a system at equilibrium, increasing its concentration,

• the reaction will shift to the same side of the equation where it appears to make more of it

• the reaction will shift to the opposite side of the equation where it appears to use some of it up

• the reaction will not shift

• byproducts (other unwanted chemicals) will be formed to use the excess

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

What does it mean to "shift" an equilibrium?

• increase the rate of either the forward or reverse reaction

• increase the rate of both the forward and reverse reactions

• make new chemicals

• adjust concentrations to reach a new equilibrium ratio

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

Which stress does not result in a new equilibrium constant?

• changing a concentration

• changing pressure

• increasing temperature

• reducing temperature

Increasing the pressure on an equilibrium system will

• shift the reaction to the side with more moles of chemicals

• shift the reaction to the side with more moles of gas

• shift the reaction to the side with fewer moles of gas

• shift the reaction to the side with fewer moles of chemicals

Tags

NGSS.HS-PS1-6

Which quantities go into an equilibrium constant expression?

• solid amounts

• exo or endothermic heat quantities

• pure liquid amounts

• concentrations of chemicals

Increasing the temperature of a closed equilibrium system

• will shift the reaction in the endothermic direction

• will shift the reaction in the exothermic direction

• will not shift the reaction

• will shift the reaction to the side with heat

Tags

NGSS.HS-PS1-5

If I add reactants only to a reaction container,

• the reaction is at equilibrium

• the reaction can only shift right to make products

• the reaction can olny shift left to make reactants

• all of the reactants will be used up

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

If an equilibrium constant, K, is 1.8 x 10^-5, at equilibrium

• I will have more reactants

• I will have more products

• I will have roughly equal amounts of reactants and products

• it is impossible to tell how much reactants and products I will have

Tags

NGSS.HS-PS1-6