Question

Which of the following is an example of a physical change?
a. dissolving salt in water. c. cooking an egg.
b. burning wood into charcoal. d. rusting iron.

Answer 1

A, because physical changes are reversible. You can't uncook an egg, unburn wood, or unrust iron! All of the others could be considered chemical changes.

Answer 2

A is the correct answer because you can also air dry the solution to get back the salt but you cannot for the others...