How would you classify salt water?
a. pure substance-element
b. mixture-heterogeneous
c. pure substance-compound
d. mixture-homogeneous
e. none of the above

D

Explanation:

A. Is wrong

Salt water is not an element. In fact it contains sodium and chlorine asides the elements of the water

B is wrong

It is a mixture but it is not heterogeneous. It is not heterogeneous in the sense that when you take a sample of salt, the composition is throughout the same I.e containing salt and water

C is incorrect

It is a mixture of salt and water. They are both compounds and hence they both exist together as a mixture

D is correct

It is correct because, a sample of salt water irrespective of the amount taken for observation would contain salt and water