Equilibrium and equilibrium constant

What are the two factors to look for when determining if the reaction is at equilibrium?

• Forward reaction rate is faster than the reverse and concentrations are equal
• Forward and reverse reaction rates are equal and concentration is conctant
• Forward and revers reaction rates are equal and concentration is equal
• Forward reaction rate is faster than the reverse and concentration is equal

Tags

NGSS.HS-PS1-6

This symbol indicates that a reaction is ____________

• reversible
• irreversible

Tags

NGSS.HS-PS1-6

When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in

• Chemical Equilibrium
• Chemical Balance
• Chemical Constant
• Chemical Reaction

Tags

NGSS.HS-PS1-6

At what time the reaction reached equilibrium?

• t₁
• t₂
• t₃
• t₄

Tags

NGSS.HS-PS1-6

It is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back.

• reversible reaction
• irreversible reaction
• decomposition reaction
• synthesis

Tags

NGSS.HS-PS1-6

Define chemical equilibrium.

• A reaction is reversible.
• The concentration of the reactants is equal to the concentration of the products.
• The rate of a forward reaction is equal to the rate of the reverse reaction.
• The reaction stops and no further change in concentration occurs.

Tags

NGSS.HS-PS1-6

Which of the following is NOT true at equilibrium?

• The forward and reverse reactions proceed at the same rate.
• The concentrations of reactants and products do not change.
• The concentration of the reactants is equal to the concentration of the products.
• The forward and reverse reactions continue to occur.

Tags

NGSS.HS-PS1-6

During equilibrium, the rates of the forward and the reverse reaction are ________

• the same 
• unequal
• unequal for exothermic reactions
• unequal for endothermic reactions

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

When the system X + 2 Y <=> Z has reached equilibrium, which of the following is TRUE?

• Forward reaction and Backward reaction stop.
• Forward reaction has sped up and backward reaction has slowed down.
• Forward and backward reactions occur at the same rate.
• Forward reaction has slowed down and backward reaction has sped up.

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

What is the K_c expression for this reaction?
   2 NO_(g)  +  O_2(g) ⇌  2 NO_2(g)

• K_c = [NO₂]² / [NO]² [O₂]
• K_c =  [NO]² [O₂] / [NO₂]²
• K_c = [NO]² [O₂] [NO₂]²
• K_c = [NO₂]² / [NO]² +  [O₂]

Tags

NGSS.HS-PS1-7