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How many classroom hours have you given students for 3. One of them interested in electrical engineering wants to do some work on galvanic cells or secondary cells. On further reflection this is probably fair enough - certainly at the time of assessment I thought the lack of a comparative graph was a significant omission and agree that the discussion on accuracy and reliability is marginal but gave it the benefit of the doubt based on existing guild of knowledge i.

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We manage to hold the title of a reputable medium that is selling the far purest form of research chemicals after getting them tested through labs. And I just thought of an excellent method I think for determining CO2 in soft drinks by adding excess barium hydroxide to ppt BaCO3, followed by decanting and back titration with HCl.

We have started doing AS3. Have added you to the existing e-mail database of about NZ Chem teachers. Instead they must modify a variable to produce a possible trend eg temperature to quote the standard.

Students are expected to request help with calculations where necessary during their 3 week class time but all write ups are done in their own time. J ust a check, I have a student who is analysing iron tablets for his investigation, Do you know if the permanganate required to titrate against is 0.

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One of our Chemistry teachers was told as a student that silver nitrate was one of the most accurate primary standards but that doesn't seem to be a widely accepted theory. Can you confirm the following thoughts please. Alternatively, if the rest of the investigation and report was at excellence standard and almost invariably this relates to the quality and depth of the discussion of results and final conclusion I would return the investigation and tell the student there was a mathematical error in their calculation and ask them to check it.

Just left at room temperature it is more likely to be days although I do know that vegetables such as sweet corn lose about half their Vit C within hours of being picked. Provided they are measuring the changing concentration quantitatively with a spectrophotometer or colorimeter and not just by eye, and it meets the other criteria for the standard I can't personally see a problem myself.

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Investigations on galvanic or secondary cells. Using projects by students doing transitional or NCEA level 2 for

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