CHM 2046C Module 10 Sample Exam

Part J: Vocabulary / More Equilibrium Shifts Chapter 16 (10 points)

__________________ 1. If all the reactants and the products are in the same phase (such as

gases), then the we say the system is in _______________equilibrium.

__________________ 2. If at least one of the reactants or one of the products is not in the same

phase, then we say the system is in __________________ equilibrium.

__________________ 3. The state where the concentrations of the reactants and the products

remain constant with time , it is said that the system has reached a state

of ___________equilibrium.

__________________ 4. The _______ _________ Q is obtained by by applying the law of mass

action using the initial concentrations of both the reactants and the

products instead of the equilibrium concentration so as to determine the

direction of the equilibrium shift.

___________________5. ____________ ________________ states that if a change is imposed

on a system in equilibrium , the position of the equilibrium will shift in a

direction that tends to reduce that change.

Predict the effect on each of the following changes to the system on the direction of equilibrium:

a. Moves to the Right

b. Moves to the Left

c. Has no effect/does not move left or right

The combination of hydrogen gas and oxygen gas to give water vapor can be expressed by
2 H₂ (g) + O₂ (g) çè 2 H₂O (g)

_________6. Water is removed as it is being generated

_________ 7. Additional H₂ is added

_________ 8. The system is cooled (assuming the reaction is exothermic)

_________ 9. The container is made larger

_________10. Nitrogen gas (which does not react with neither reactants nor products) is injected

into the cylinder causing a change in the pressure.