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ummm. Yeah, i suppose. For pH of 1 and 2 i would use HCl of different concentrations. For a pH of 3, 4, 5 and 6, u would use a weak acid (not sure if u chemistry lol) such as carbonic or acetic acid of different concentrations. For the basic pH values, you could use sodium carbonate...

English Pepper Moths were originally white. When industrialisation occured, the trees became polluted with carbon and turned black instead of being their original white bark colour. The rare, black moths (formed from natural mutations) survived as they better camouflaged on the trees and were...

hmmm...yep...definitely a good choice.

thats cos u hate science. I like science. It actually teaches u the core basis of how the world works. Legal studies is terribly boring. If ur in year 10, dont do it. The only reason i do it was cos it was the best subject on the line. I shoulda done earth and enviro science by...

what was the specific question? was it something like "write a reaction with an acid similar to acid 1 and NaOH" I wrote NaOH + HCl --> H2O + NaCl I dont know if its right.....

i just found the averages of the creek samples. The only one that failed the safety requirement was stream 2. I said it may have been located near a farm, and received fertiliser or effluent runoff, causing more phosphates. For the third part i said how phosphates cause eutrophication...

what was the question specifically?

What exactly were the parts for this? I think i put that both acids are strong (acid 1 stronger than acid 2) but that acid 2 was less concentration than acid 1. Im not sure if im right with this. I put acid 2 as strong, cos i didnt think that a weak acid would have a pH of 2. There was...

i didnt use the terms 'equivalence point' or 'end point' (i know what they are, but i didnt use them, shit) but i did mention that phenolphthalein changes pink at about pH 10, and thats where both titrations were raising in pH and all hydrogen ions had been neutralised. I hope thats enough...

The Bread Question? It was 1.77%. And yes...i did get that question right...unlike the bloody HoC lol. btw, why was phenolphthalein a suitable indicator? Was it cos both 'vertical line parts' were at about the same pH values?

yeah its a general thing that were meant to know - aluminium.

thats good. thanks mate.

for the second part of the first section in shipwrecks, i expalined the effectiveness of methods such as galvanisation, surface alloys and use of passivating metals. Was that sufficient?

yeah i totally understand yas. Ive done it wrong. I just thought that because only half the heat was reaching the water, i thought that i would halve the theoretical heat to calculate how much was actually heating the water. Anyways. Thanks guys. :(

why would i multiply the heat value by 2, when the heat that is absorbed by the water is only half of that theoretical value. Im not doubting u, i just want an explanation if ur correct.

thats good mate. :) I need some good news to break up my legal studies study :(

Tell me if i did this wrong. Heat = -0.21 x 4.18 x 10^3 x 65 = 57.057 KJ I then divided this value by 2, because it said half the heat was lost to the environment. Therefore, Heat = 28.5285 As HoC = Heat on moles Therefore ; 1367 (given) = 28.5285 divided by m/(12.01 x 2 + 1.008 x...

what was the answer to the heat of combustion question? was it like 0.9 g of ethanol (i found the heat and divided it by 2, i didnt divide the heat of combustion (given) by 2).

1. (same as above) 2. Keep the can as close as possible to the flame (without it being dangerous lol)

hey with that solvent one. I stated about hydrogen bonds, dipole dipole, and dispersion forces, polarity and electronegativity, th fact that water is inorganic but ethanol isnt. I drew diagrams of both molecules showing the highly electronegative oxygen atom. Was that enough?