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please help. thanks! The scientist notices that as they continue their experiments over the course of a couple of weeks, that the chemical becomes less

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The scientist notices that as they continue their experiments over the course of a couple of weeks, that the chemical becomes less effective. They hypothesize that it is decomposing due to reacting with something in the air. 6. If this is true, would this be a physical change or a chemical change? 7. What step of the scientific method has this scientist just employed? 8. What would be the next step of the scientific method that they should follow? Give them a specific recommendation as to how they should employ that step

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