Need help for thnking of errors for a chem lab

[Xylitol]

Basically, my teacher wants our class to think of 3 errors to put onto our lab report for things that could have not gone as planned if the lab was perfect
(Cant do things like contamination / human problems)

The lab involves given 11 random solid substances and then adding different liquids until you come to the names of all 11 judging by their reactions to the liquids.

 

[Xylitol]

bump due in 30 minutes

 

[leftyman]

sounds like your teacher wants you to do the thinking.

 

[Gibsons]

Given time, some of the substances you're using might degrade and/or change, like by absorbing water or CO2 from the atmosphere.

 

[calvinbiss]

Not adding enough liquid to ensure reaction and therefore could not judge the substance.

How can your teacher disregard contamination!?

 

[So]

Parallax. Parallax is ALWAYS an error.

 

[Xylitol]

Originally posted by: So
Parallax. Parallax is ALWAYS an error.

Not this time because there's no measuring
Thanks though
and thanks to others

 

[richardycc]

I can think of a lot, like reaction might not take place under room temperature/ATP condition, etc, I aint gonna do it for you, go do your own homework yourself.

 

[mfbf]

How about the reaction is too slow and didn't react in the time your were observing it.

 

[EngenZerO]

dirty equipment, contamination, temperature, lighitng, atmosphere, mislabeled molarity on bottles of solution...