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Pretty sure it was the precipitate, getting the %w/w EDIT: I was happy with the multiple choice, I got pretty even frequency (e.g. 4As, 4Bs, 4C,s 3Ds) I forgot which one got 3 but oh well :P

For the water multiple choice I think I got B :D

I failed the water one. Option topic - O_O!! NO NaOH, NO Solvay, heck, what's the environmental impacts of detergents??!! Yeah, that's me in the exam :)

Yes! I got 4 Ds in a row!!!! Last one's B :P Multiple choice was good...

Preliminary physics

You could Get a piece of white paper, draw a black cross on it. Place this under a calibrated cylinder, and fill with water until the cross disappears. Read the calibrations to determine the amount.

Yiss yiss Question - who were Bronsted and Lowry?

I do dry cell and mercury oxide button cell. Some like the silver oxide button cell, they're very similar. If you're going to study it now, definitely do a button cell as it's easy and you should be able to get it done by tomorrow ;)

NaOH(aq) + HCl(aq) --> NaCl(aq) + H2O(l)

Subsection 4 of the second module

The dot point says it all: "Gather and present information on the structure and chemistry of a dry cell or lead-acid cell and evaluate it in comparison to one of the following: -Button Cell -Fuel Cell -Vanadium redox cell -Lithium Cell -Liquid junction photovoltaic cell (e.g. the Gratzel Cell)...

Ok *braces myself* *Gets a better idea and steals Azreil's whip* Gosh danz90, Azreil still hasn't noticed, I think, that I've been editing her name in all the quotes from page 33 xD

Cracking is where molecules of carbon compounds are broken down into smaller molecules with the aid of heat and / or catalysts. Inorganic catalysts such as alumina-silicon gel are used.

I'm not too sure, but I think the flame atomises the sample and makes it excited. The light shines with the same wavelength that the atoms absorb. Every atom absorbs a different wavelength. Depending on how much light is absorbed, the concentration can be determined.

Ethyl ethanoate in nail polish remover, and as a solvent

Sodium carbonate? It can be obtained in a pure form, as a solid. We know its formula of Na2CO3 It is stable It does not react in air, nor does its mass change from exposure to air or water. It is soluble in water. Yay for sodium carbonate Question - what is the test to measure [N] and [P] in...

No it's a good answer we love our food Indicators can be used in testing the pH of soil. Since the soil is brown, a neutral white powder is used as a background for any colour change. Soil pH can affect crop productivity and growth. Indicators can also be used to check the pH of water in...

PVC (Polyvinylchloride) PVC is a polymer made from chloroethene monomers. PVC can be used for flooring and carpet backing. This is because it is soft, pliable, has low static electricity and has fire and water resistance. It can also be used for sheets for roofs and skylights, as it is...

Americium-241 is used in smoke alarms. It emits alpha radiation and low energy gamma radiation, which ionises air particles. A small current is run through this. When smoke enters the chamber, ionisation decreases. The drop in current sets off the alarm. An advantage of americium-241 is...

Depends which one. Obviously for strong acids and bases it's not in equilibrium, but there's some ionisations apart from acids / bases that are in equilibrium, I think... Actually, not so sure about other ionisations, but disscosciations are sometimes in equilibrium, such as Fe3+(aq) +...