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Both.

Best of luck today everyone! Stay calm and don't freeze up if you don't understand a question; it's not that important in the scheme of things. Knock em dead in there ;]

Okay. Delta H = - mCdeltaT m=mass of water C=specific heat capacity of water [4.18] delta T= change in temp ie larger temp - lower temp. The molecular weight is found by adding the mass numbers of a substance (from the periodic table) together. eg Molecular weight of CO2 is 12 + 2 *...

Three people have got 1.54 I'm nearly positive that's right. MOVING ON. Outline the industrial and natural sources of NOx and SO2

YOU SAW NOTHING. And by that I mean I realised and fixed my mistake but not fast enough for you to miss it >>

Amount OH- = 0.2 * 0.03 = 0.006 Amount H+ = 2 * 0.1 * 0.04 = 0.008 0.002 H+ in excess in 70mL /70 * 1000 = 0.028571428571428571428571428571429 -log[0.028571428571428571428571428571429] = 1.544... = 1.54 (2sf) I made this question up and everyone's getting...

Temp/Salt/O2 yus. Rate of electrolysis no, it's hooking the anodes to a transformer rectifier in the electrolyte and testing the conditions.

YOU STOLE MY WHIP! D: Calculate the pH of a substance when 30mL 0.2M NaOH is mixed with 40mL 0.1M H2SO4.

I have to go cook dinner for my family guys, I'll be back in 45-1 hour. If you're gone by then, best of luck to you tomorrow. If you aren't, prepare for me to crack my whip again. =D EDIT: Don't be mean, Jason, I realised =P With the amount of nicknames I have (Azreil being one, Brutha and...

Flame = correct. The light is white and therefore emits every spectra. The wavelength can therefore be determined, and as you said about the amount absorbed. What conditions are required for catalytic cracking?

We did this prac and found that it hadd a pH of 6.33... does my working make sense for that? =/

Dot point asks about a recent development and use of a named biopolymer. Cellulose is not recent. Know about one (apart from cellulose) before your midcourses would be my adive. Not hard to learn about.

NH4+ + H2O <-> NH3 + H3O+ Cl- + H2O <-> HCl + OH- NH3 is a weak base, OH- is a strong base. Both HCl and H3O+ are strong acids. Hence the salt is slightly (but only slightly) acidic. Outline examples of uses of esters (not including as flavourings, cause everyone know that).

Assess the effectiveness of the steps taken to alleviate the problem with CFCs. The introduction of the Montreal Protocol has been highly effective in alleviating the problem of CFCs. While the allowance of HCFCs to be used for a short time was largely ineffective, it was a "stopgap"...

D is exposed to air; this is the one that proves the hypothesis of the prac: that H2O and O2 are both required for rusting to occur. In C, the water is boiled, poured into the test tube, the nail is placed in and the oil is added to the top.

No.

Explain the use of acetic acid and citric acid as food additives. Both have a preservative and taste aspect which is added to foods. Citric acid is found naturally in many fruits and vegetables. It has a milder, sour (citrusy lol) taste and can be used in sweet foods. Acetic acid has a...

Made me think and remember them, hope it helps you too.

Azreil was not doing your question, but doing breadbox summaries of all the Shipwrecks pracs for someone in that subforum. Discuss the benefits and problems associated with the use of ONE radioactive isotope in industry. Cobalt-60 is used to monitor the structural integrity of joints and...

Concentration of electrolyte, nature of electrolyte, nature of electrodes, size of electrode, voltage applied, etc. gimme a sec on the descriptions. EDIT: Okay. Conditions under which rusting occurs: cleaned nails in each of a) test tube open to air; b) test tube with silica gel and...