When an iron nail is ground into powder, its mass .
a. stays the same
b. decreases
...
When an iron nail is ground into powder, its mass .
a. stays the same
b. decreases
c. increases
d. cannot be determined
When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place?
a. a physical change
b. a chemical change
c. neither a physical change nor a chemical change
d. both a physical change and a chemical change
Answers: 1
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