Chemical vs Physical change/property

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The discussion revolves around identifying whether specific scenarios represent physical or chemical changes. The scenarios include removing a grease spot, obtaining salt from salt water, fogging ski goggles, melting a snowball, and heated oil smoking. Participants initially provided differing answers, particularly for the grease spot removal, with some considering it a chemical change while others deemed it physical. The conversation highlights the confusion surrounding the classification of changes, especially in practical examples. Ultimately, participants reached a consensus on the correct classifications for each scenario.
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Homework Statement


5. [1pt]
For each of the following, indicate whether the statement describes a physical (P) or a chemical (C) change. Answer, in order, with a single string, e.g. CPCPC -- NO SPACES, NO PUNCTUATION.


a) A grease spot is removed with cleaning fluid.
b) Sodium chloride (salt) is obtained from salt water by evaporation of the water.
c) Ski goggles become fogged.
d) A snowball melts.
e) Heated oil smokes and turns brown.

The Attempt at a Solution


For a) chemical to remove the stain
b)physical
c)physical
d)physical
e)chemical
 
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Nevermind I got it.
 
What did you get for a?
 
I got physical for A.
 
Ooh-rah!
 
Haha that one was tricky you must admit :)
 
I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
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