Friday, 2 September 2011

#6



H2N2O2(HO-N=N-OH)

+

H4SIO4(SI(OH)4)

H2O + H2OSO4

H3PO3(HPO(OH2))

H2SO4 => SO4

H2OSO4 = H


Chemistry – A-level/undergraduate level

This is a frustratingly inconsistent approach to writing chemical formulae. On the one hand the teacher has gone to the trouble of also using structural formulae to improve clarity (eg H2N2O2 could be nitramide, but the addition of HO-N=N-OH makes it clear that we are dealing with hyponitrous acid here), but then writes SI (sulphur iodine) instead of Si (silicon) in the formula for orthosilicic acid. This, combined with not using subscripts for many of the numbers, could lead to a great deal of confusion.


Whilst this lesson appears to be aimed at quite a high level, such elementary errors may affect comprehension.

5/10 - rather sloppy.



12 comments:

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  3. This comment has been removed by a blog administrator.

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  5. Well, I think that, in this particular case, SILICON is far more adequate than sulphur iodine.

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  6. Joaquín - 5/10. I think you mean silicone (not to be confused with silicon).

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