hunterpostbacst

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Apr 7, 2009
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There are physical change and chemical change in classifying changes in general chemistry. I thought the nail rust is a kind of chemical change because the nail is oxdized through the chemical reaction. But, topscore says not.

Anyone, please?

I went through kaplan and destroyer twice and thought my knowledge of science is all set to DAT next Saturday. But, when I took topscore I got 18...DAT is almost same format and level as topscore?
 

dl9006

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Jul 2, 2008
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could you post the exact question?

i would have thought rusting would be considered an electrochemical reaction.

it is going from iron to iron oxide...
 

bennijai

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Rusting of nail should be classified as a chemical change...oxygen is binding with the metal to make rust.
 

smurf528

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Nov 14, 2008
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Well, my Topscore says it is...here's the question.

Identify the incorrectly matched process with its respective physical/chemical change.

A. Antifreeze Boils: Physical Change
B. Sugar Dissolves Physical Change
C. Gasoline Burns: Chemical Change
D. Nail Rusts: Chemical Change
E. None of these
 

jay47

Think Positively!
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Maybe you're not understanding the question. It asks which is INCORRECTLY paired. All of the answer choices are paired with their respective partners.
:thumbup:

Exactly..read the question carefully....