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July 28, 2015

Homework Help: Chemistry

Posted by Sheryl on Monday, March 23, 2009 at 6:19pm.

I did a lab where I had to decompose the compund patassium cholorate (KClO3)by heating,I had to weight the test tube then the test tube with the potassium chlorate to get the weight. I then had to heat it for several minutes and letting it cool down before weighing it again. Why must the test tube be cool before you weight it? I know because you can't touch it when it's hot, but I am sure there is another reason as well and I am not sure of it. Thank You

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