Astudent is told that both energy and mass must be conserved in every chemical reaction. she measures the mass of hydrochloric acid and a zinc strip separately. she then places the zinc strip into the acid and bubbles form as the zinc looks like it disappears. the combined mass afterward is less than the original. which of these can explain this result?
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Awhite powder is added to a solution. the images show observations made before the powder is added, just after the powder has been added, and a little while later. (the liquid in the small beaker is phenol red solution.) what evidence shows that a chemical change has taken place?
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Astudent is told that both energy and mass must be conserved in every chemical reaction. she measure...
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