5 Select the correct answer.
A chemistry student heated Iron (a graylsh solid) with sulfur (a yellow solid) and observed a black, lumpy solid forming. What is the student's
conclusion?
A. A physical change has occurred, and a new substance has formed.
B. A chemical change has occurred, and a new substance has formed.
OC A physical change has occurred, and the reactants and products have the same properties.
D. A chemical change has occurred, and the reactants and products have the same properties.
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