Mrs. Franklin loves teaching science and thinks about it all the time. While walking one day, she steps on a warm, fresh piece of used gum. The gum flattens and sticks to her shoe. When she lifts her foot, she sees long strings of gum between her shoe and the sidewalk. She thinks, “What a great demonstration of the properties of metals!” What properties of metals would Mrs. Franklin most likely teach about with this demonstration?
Answer
A
conductivity and ductility
B
conductivity and luster
C
malleability and reactivity
D
ductility and malleability
Explanation
The gum flattens when stepped on, demonstrating malleability—the ability of a material to be hammered or pressed into a different shape. The long strings show ductility, the ability to be drawn or stretched into thin strands. So the properties demonstrated are ductility and malleability, choice D.
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