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How many neutrons does an element have if its atomic number is 50 and its mass number is 166
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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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Byrd has a mug of coffee at a temperature of 93°C. He sets the mug on a counter in a room with an ai...
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