AP Chemistry
4.4 Physical and Chemical Changes
4.1 Introduction for Reactions
A student evaluating a solid for use in an oxygen-generating device heats a pure sample of \(\text{NaClO}_3\text{(s)}\) in a reaction tube. During heating, the solid becomes a colorless liquid and then releases a colorless gas. The gas is collected after the initial air in the apparatus has been displaced. Which observation would provide the most definitive evidence that the sample underwent a chemical change rather than only a phase change?
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