Ben and jerry were testing powders in science lab. first they put the powder in a zip lock bag. next they added some water. the powder fizzed and bubbled; soon it disappeared. when the bubbling stopped the bag contained a clear liquid and a lot of gas. what is the most obvious sign of a chemical change in this reaction?
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Ben and jerry were testing powders in science lab. first they put the powder in a zip lock bag. next...
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