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Two substances each have a temperature of 23 degrees Celcius. After they are combined the temperature rises to 27 degrees Celcius. What evidence proves a chemical reaction occurred?
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Chemistry, 22.06.2019 23:30
With the largest atoms and the smallest number of valence electrons and with the smallest atoms and the greatest number of valence electrons are the most reactive. a. nonmetals; metals b. nonmetals; transition elements c. transition elements; metals d. metals; nonmetals
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Chemistry, 23.06.2019 03:00
Analyze the reaction to determine whether the reaction is exothermic or endothermic. explain your reasoning.
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