Unit 2 Stoichiometry?

[Yoda]

What type of stoichiometry do you use in unit 2.
Is it just basic things like mass mass, mole mole, moles to grams?

Thanks

[charmanderp]

Explain the question further, you must.

[Yoda]

I just want to know the types of questions and stuff stoichiometry in vce chemistry you learn

[MonsieurHulot]

Having just completed Unit 2, I can tell you what we did. We did mass/mass problems, mole/mole, mole/mass, mass/mole and some titration problems.

[charmanderp]

Well first and foremost it revolves around finding the number of moles you have of a certain substance. This is done using the various formula (n=m/M, n=CV, the ideal gas laws, etc). In unit 3 (and unit 2 in less depth and complexity) we investigate how analytical chemists use this data in their study of chemicals. For example part of the course involves a form of instrumental analysis called UV-Vis spectroscopy where light in this region of the electromagnetic spectrum interacts with particicles of matter, in say, a solution of lead ions. Fortunately you won't need to learn much of the theory behind this but stoichiometry plays a key role in realising how the interaction of light with matter depends on how much of the substance is present in the solution (ie. how highly concentrated it is).

In its most basic sense, which is what you'll delve into during Unit 2, we look at volumetric analysis (involving solutions) and gravimetric analysis (involving solids). We might take a fertiliser and try to determine the ammonia concentration via titration, and this is where stoich comes into it. There are all sorts of other calculations that you'll need to do (finding pH, etc) but they're all very basic and it comes with understanding such as the balancing of equations, etc. In Unit 4 you apply this knowledge on a totally different level (how chemistry is involved in the industrial sector) which is again very straightforward and applied. And it's heaps of fun, trust me (: The force is with you!