Sketch the key components of a ph combination electrode and very briefly describe in your own words how it works and how does one use it to determine the ph of a solution. (4) give the reaction that relates the cell potential to the ph of a solution. do you expect an increase in the ph of a solution to result in an increase or decrease in the measured cell potential. (5) sketch the curve that describes the relationship of the cell potential to the ph of a solution in potentiometric measurement. label your axes correctly for credit. (6) sketch the titration curve of a polyprotic acid with a strong base and identify on your graph regions/values such as the buffer regions, pka values, volumes at equivalence point..etc.

Pbco3 –> pbo+ co2. how many liters of carbon dioxide gas is produced from the decomposition of 32 grams of lead (ll) carbonate?

The earth's moon is unusually large. two popular theories of the moon's origin include the "sister world" hypothesis, which states that the moon formed from the same materials as the earth, near enough to the earth that they fell into orbit around each other. a second theory is the "capture" hypothesis, in which the moon formed elsewhere in the solar system, and the earth's gravity pulled it into its orbit. studies of what the moon is made of indicate that some of its materials had to come from the earth or from the same area of the solar system where the earth had formed. at the same time, the moon does not contain much of the material that makes up the earth's core, so the moon could not have formed from the same materials as the earth. how do the two facts above affect the described theories of the moon's origin? a. they show that scientists will never agree on where the moon came from. b. they show that more experiments on moon formation need to be done. c. they show that no theory accounts for the existence of the moon. d. they show that neither theory is complete and entirely correct.

How many neutrons does a atom of cobalt have?