5. Classify each of the following changes as physical or chemical and explain wh

Question

5. Classify each of the following changes as physical or chemical and explain why you made this choice for each of the following. (14 points - 1 each for choice, 1 each for explanation)
A) Wine becomes vinegar. - Chemical changes
B) Iron railing becomes rusty.- Chemical changes
C) An infant gains 12 kilograms of mass-Physical changes
D) Peanut is burnt to ash in lab experiment. - Chemical changes
E) Rock is ground into sand-Physical changes
F) Chocolate melts in hot water (note that it does not dissolve).- Physical changes
G) A broken leg mends itself- Physical changes

Explanation / Answer

A) Wine becomes vinegar. - Chemical changes as the chemical properties are changing as well as the molecular formula B) Iron railing becomes rusty.- Chemical changes due to formation of Fe2O3, this is a chemical reaction C) An infant gains 12 kilograms of mass-Physical changes Change in state is a physical change D) Peanut is burnt to ash in lab experiment. - Chemical changes it got oxidised to ash which is a chemical change-combustion E) Rock is ground into sand-Physical changes - here no chamical properties are altered, just the physical state is changed F) Chocolate melts in hot water (note that it does not dissolve).- Physical changes melting is a form of changing the state of the marterial and hence a physical change G) A broken leg mends itself- Physical changes this a physical phenomenon of joining of ligaments with time

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