4 Which experiment does not provide evidence of a chemical reaction? Experiment 1, because gas formation is a sign of a chemical reaction. Experiment 4, because bubbling is caused by air escaping from the mixture. Experiment 3, because melting is a physical change not a chemical reaction. Experiment 2, because the formation of rust is a sign of oxidation.

Question

4 Which experiment does not provide evidence of a chemical reaction? Experiment 1, because gas formation is a sign of a chemical reaction. Experiment 4, because bubbling is caused by air escaping from the mixture. Experiment 3, because melting is a physical change not a chemical reaction. Experiment 2, because the formation of rust is a sign of oxidation.

Answer 1

The correct answer is Experiment 4, because bubbling is caused by air escaping from the mixture.In a chemical reaction, there are several signs that indicate a chemical change has occurred, such as the formation of gas, change in color, formation of a precipitate, or change in temperature. In Experiment 1, the formation of gas is a sign of a chemical reaction. In Experiment 2, the formation of rust is a sign of oxidation, which is a chemical reaction. In Experiment 3, melting is a physical change, not a chemical reaction.However, in Experiment 4, the bubbling is caused by air escaping from the mixture, which is not a sign of a chemical reaction. Therefore, Experiment 4 does not provide evidence of a chemical reaction.

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