I really need to know if anyone has had issues with test tubes either spitting water (big time - I mean nearly the entire contents coming out like a projectile) instead of boiling, or even just exploding (glass shattered and spread in about a 2m radius). We have just bought new test tubes and the only thing I can think of is that because they don't have any scratches or anything the water is getting super-heated or something.
We have cancelled all test tube heating pracs (not doing much for the confidence of the year 7 kids - this is their introduction to bunsens!!). Great way to explain how lab coats and safety glasses are so important though!!
Thanks for any feedback
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Rosalie