Chemistry Equilibrium

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 constant

• 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

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

• Stoichiometry

• Chemical Reaction

For the reaction... N_{2 (g)} + 3 H_2(g) ⇌ 2 NH_{3 (g)} If the pressure in the system is increased, which substance(s) will increase in concentration?

• N₂

• H₂

• N₂ and H₂

• NH₃

What is the effect of increasing the pressure on the following equilibrium: 2NO(g) + O₂ (g) ⇌2NO₂(g)?

• The yield of NO₂ increases

• The yield of NO₂ decreases

• The reaction is slower

• The concentration of O₂ increases.

A very high value for K indicates that

• reactants are favored.

• products are favored.

• equilibrium is reached slowly.

• equilibrium has been reached

For any reaction at chemical equilibrium, the concentrations of products and reactants

• are equal.

• change

• remain unchanged

• decrease

Tags

NGSS.HS-PS1-6

TRUE or FALSE:

"At equilibrium, the CONCENTRATIONS of products STAY the SAME"

• True

• False

Tags

NGSS.HS-PS1-6

TRUE or FALSE:

"At equilibrium, the RATES of the forward and reverse reactions are EQUAL"

• True

• False

Tags

NGSS.HS-PS1-6

An exothermic reaction is allowed to reach equilibrium. If heat energy is then removed, the equilibrium will shift

• toward the middle

• toward the reactant side

• toward the product side

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Why is equilibrium called a dynamic state?

• Chemists try to convert as much reactants as possible into products.

• The reactions at equilibrium continue to take place once equilibrium is established.

• The products of a forward reaction are favored, so equilibrium lies to the right.

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