A. Use the equation below to answer questions 8-9.
2 HI(g) H ()+1, (g)
8. If the volume of the system is increased at constant temperature, relative to the original
equilibrium mixture, which of the following will be true when equilibrium is
reestablished?
The concentration of HI will increase and the concentrations of H, and I will
decrease
b. The concentration of HI will decrease and the concentrations of H, and I, will
I
increase
The concentrations of all three species will be lower
d. The concentrations of all three species will be unchanged
9. If a catalyst is added to the system, relative to the original equilibrium mixture, which of
the following will be true when equilibrium is reestablished?
a. The concentration of Hl will increase and the concentrations of H, and I will
decrease
b. The concentration of HI will decrease and the concentrations of H, and I, will
increase
c. The concentrations of all three species will be lower
d. The concentrations of all three species will be unchanged
C.

Follow the steps provided in the simulation to add water to the graduated cylinder, select one of the three samples (copper, silver, or gold), set its mass to the values given in the statements below, and calculate its density. here is a summary of the steps required: add water by clicking and holding prepare a known volume of water button. until the desired volume of water has been added. if more than the desired volume is added, click the reset button. button and redo the procedure. a single click will add about 21.0 ml of water. to set the mass, click and hold weigh out metal button. until the desired amount of metal is added to the weighing pan. once the desired mass of the metal is added, release the button. transfer the metal to water and then click on calculate density button. to see how the density is calculated using water displacement to measure the volume of the solid. to save time you can approximate the initial volume of water to â±1 ml and the initial mass of the solid to â±1 g. for example, if you are asked to add 23 ml of water, add between 22 ml and 24 ml. which metals in each of the following sets will have equal density? check all that apply.

Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?