2009 ADA Test Questions: Bio, GC, OC

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GCHEM:
66) Which is NOT an example of a chemical change?
a) hydrogen peroxide decomposing into molecular oxygen and water
b) methanol burnin in air w a colorless flame
c) aluminum foil melting at 660 deg C
d) JCL neutralizing a solution of NaOH
e) iron metal rusting
Answer: C, why?

OCHEM:
90) Why isn't the answer A? That's straight up from Chads isn't it? Wouldn't this oozonolysis problem end up in an aldehyde and ketone?

BIO:
What's the general role of calcium carbonate in the body? It's more related to muscles/movements right?

 

[FeralisExtremum]

Aluminum foil melting is a physical change (specifically a phase change). It goes from solid to liquid form, but is not chemically altered.