Predictions for Chemistry 2014 HSC? (2 Viewers)

Hi there444

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Lol mreditor doesn't do chem doubt he's going to look at this thread

whats yours Hi there? :D


OMG HOW DID YOU FIGURE THAT OUT!!!!!!!
Hahaha I cant just say that out in public. But who knows abdul may be his name and faisal is not included in his name?
 

Hi there444

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The pracs are simple. Most take like 2 seconds.

You have to elaborate on what i've written below, but in simple terms.

Water Hardness - chuck soap flakes in soft water and hard water. Soft water = froth, Hard water = small powder (scum aka calcium stearate) at bottom of test tube. Titration with EDTA (also not done by most schools, just got to know the ratio is 1:1, ratio of Calcium ions to EDTA ions
Turbidity - using a turbidity column, pour water in until you cannot see the "X" at the bottom, read of measurement on the column.
pH - pH meter or pH probe attached to a data logger.
Ions - precipitation
BOD - Gather water, measure the dissolved oxygen concentration. Place in brown blag, place in the dark for 5 days. Measure DO again, difference in DO levels = BOD.
Total Dissolved Solids - using a conductivity meter or evaporation of water sample.
DO - using oxygen sensitive electrode or Winkler titration (titration which you do not do at school, too long and complex)
Oh btw isnt it turbidity tube or secchi disk?
 

GOsie

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Reviving my shipwrecks question as it was left unanswered.
i) Name of method for removing salt from an artifact recovered from a wreck (1 mark)
ii) Explain, with reference to two examples, chemical procedures used to clean and preserve artifacts from wrecks (5 marks)

Non-shipwrecks people:
Outline the difference in chemical structure between the Oxygen molecule (O2) and the Ozone molecule (O3), and with reference to these, outline two differences in their chemical properties (4 marks)
 

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