A student concludes that a chemical reaction performed in a classroom investigation was exothermic. To communicate the validity of this conclusion, which would make the best visual evidence in a presentation?
photographs of reactants and products listing of masses of reactants and products listing of time from start to finish of reaction photograph of a flame produced when the chemicals reacted
Question: A student concludes that a chemical reaction performed in a classroom investigation was exothermic. To communicate the validity of this conclusion, which would make the best visual evidence in a presentation?
A. photographs of reactants and products
B. listing of masses of reactants and products
C. listing of time from start to finish of reaction
D. photograph of a flame produced when the chemicals reacted
Answer: