Answer
A Physical
B Chemical
C Physical
D Physical
Work Step by Step
A Since the mixture is not chemically bonded, it would only need a physical change.
B Since iron is chemically bonded to oxygen in rust, there would need to be a chemical change.
C Since seawater is just a solution of substances dissolved in water, there would need to be a physical change.
D Since the water is not chemically bonded to the sand, there would need to be a physical change.
