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B) "How many electrons are in neutral Pb-206? Pb-207? Pb-204?
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Which is true according to the law of conservation of energy
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Two solids are mixed in a flask and stirred. after a few minutes, the flask becomes cold. which of the following best describes this reaction? a. an exothermic reaction b. a combustion reaction c. an endothermic reaction d. a decomposition reaction
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Which of the following describes qualitative data? a) recording the temperature of a solid as it is warmed. b) noting the color of a solution as it is heated. c) measuring the volume of an object by water displacement. d) taking the mass of an object using a balance.
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B) "How many electrons are in neutral Pb-206? Pb-207? Pb-204?...
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