Analysis:
H2(g) + I2(g) 2 HI (g)

Note: it is a good idea to print this page so that you have the questions available to use while you are running the simulation.  If the simulation is running while this page is open, response times to answers will be very slow when you click on them.

1. Starting with no H2 and I2 in the container, and 0.4 M HI at 356 °C, an equilibrium is reached at
a) 0.5 hours     b) 8 hours    c) 12 hours    d) 20 hours

2. Starting with 0.2 M H2 and I2, and  no HI in the container at 356 °C, an equilibrium is reached at
a) 0.5 hours     b) 6 hours    c) 10 hours    d) 20 hours

3. When you start with no H2 or I2 and 0.4 M HI in the container at 356 °C, the initial forward rate of the reaction H2 (g) + I2 (g) 2 HI (g) is
a) greater than the rate of the reverse reaction
b) equal to the rate of the reverse reaction
c) less than the rate of the reverse reaction

4. When you start with no HI in the container, and 0.2 M H2 and I2 at 356 °C, the initial forward rate of the reaction H2 (g) + I2 (g) 2 HI (g) is
a) greater than the rate of the reverse reaction
b) equal to the rate of the reverse reaction
c) less than the rate of the reverse reaction

5. How can you tell that this is a true equilibrium?
a) the same end condition is reached if you start with the reactants or products side
b) the concentrations stop changing after a while
c) the concentrations become identical for the reactant and product

6. When the temperature drops to 300 °C you reach an equilibrium in 20 hours.
True
False

7. At 400 °C
a) you reach the same final state of equilbrium as at 356 °C, but much more quickly
b) there is no change to the equilibrium at all compared to 356 °C
c) you reach a different equilbrium concentration than at 356 °C, but at the same time
d) you reach a different equilbrium concentration than at 356 °C, and do so more quickly

8. Comparing the results at a temperature of 356 °C with

you find that:

Increasing the concentration (case 1 above) causes equilibrium to be reached more quickly, and the concentration of both reactant and product molecules to be greater at equilibrium.

Write out an answer that explains why the above statment is true, and compare it to this answer.