Just got home, and got 4 hours sleep last night, so forgive me if this is garbled.
It's a standard chemistry conversion and convention, and pretty important for most analytical chemistry (so I'd argue that it's reasonably valid as a test construct to allot quite a high proportion of questions to include this). Also, most chemistry students wouldn't see the unit conversion as the same question, because it arises in a variety of contexts, at different stages - to some extent this rewards students who 'transfer' procedures appropriately, and this is generally a good thing to reward in exams.
In practice, my only concern is whether there were any students who fell down because of this conversion being needed - and this would have been lamented continuously in Examiner's Reports if this were the case - both A levels and GCSEs tend to self-correct from year to year in this fashion.
no subject
It's a standard chemistry conversion and convention, and pretty important for most analytical chemistry (so I'd argue that it's reasonably valid as a test construct to allot quite a high proportion of questions to include this). Also, most chemistry students wouldn't see the unit conversion as the same question, because it arises in a variety of contexts, at different stages - to some extent this rewards students who 'transfer' procedures appropriately, and this is generally a good thing to reward in exams.
In practice, my only concern is whether there were any students who fell down because of this conversion being needed - and this would have been lamented continuously in Examiner's Reports if this were the case - both A levels and GCSEs tend to self-correct from year to year in this fashion.