Chem Semester 2 Final

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-PS1-5

NGSS.HS-PS1-6

If a reaction is reversible and has reached equilibrium, what can be said about the amounts of reactants and products?

• some reactant, some product
• no reactant, all product
• all reactant, no product

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 two graphs reaches equilibrium?

• The left one.
• The right one.
• Both of them.
• Neither.

Tags

NGSS.HS-PS1-6

This symbol indicates that a reaction is ____________

• reversible
• irreversible

Tags

NGSS.HS-PS1-6

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...
heat  +  N₂  +  O₂  <−>  2NO
If the heat is added to the chemical system, the equilibrium will shift _______.

• left
• right
• left and right
• neither left nor right

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

For the reaction...
heat  +  N₂  +  O₂  <−>  2NO
If the heat is removed to the chemical system, the equilibrium will shift _______.

• left
• right
• both left and right
• neither left nor right

Tags

NGSS.HS-PS1-4

For the reaction...
heat  +  N₂  +  O₂  <−>  2NO
If the heat is added to the chemical system, the concentration of O₂ will _______.

• increase
• decrease
• remain the same
• triple

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

For the following hypothetical equilibrium, what is the value of the equilibrium constant if the concentration are as shown?

A _(g) + 2B _(g) <-----> C _(g)

[A] = 0.000045 M, [B] = 0.022 M, [C] = 0.0094 M

^{Calculate Keq:}

• .22

• 9.9

• 4.3 x 10⁵

• 2.3 x 10⁸