Here are the answers:
a) physical change because fog is water vapour that is condensed into droplets of moisture
b)chemical change because new substances are formed: smoke and cancer cells-causing chemicals)
c)chemical change because the growth involves chemicals being produces and used up
d)chemical change because rust is a new substance formed by combination of iron, air and water)
e)physical change because no reaction has occurred to make new substances
f) physical change because we are only separating substances, not producing new ones
If you got perfect, you are ready to go but if you got less than 4 you need to study... :(
Written by JK
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