Which of the following is not an example of a chemical change?
a. melting snow
b. a tarnished spoon
c. forming a precipitate
d./resperation

Can someone me with questions 15 to 17 plz.

Give more examples of this type of heat transfer:

What two factors can affect the properties of a hydrocarbon? a. the number of its carbon atoms and the number of single bonds b. the number of its carbon atoms and the arrangement of its atoms c. the arrangement of its atoms and the number of its double bonds