Question

part b while studying chemical and physical changes, students added salt to a glass of water. they stirred the salt until it dissolved and could no longer be seen. “thats a chemical change,” sarah stated. do you agree? explain. a yes, it is a chemical change because something new is formed. b no, it is a physical change. it is salt and water and you can get the salt back by boiling off the water. c yes, it is a chemical change because there was a change in the appearance of one of the components, the salt. d no, it is a physical change. a chemical change cannot occur when you mix two compounds together like salt, nacl, and water, h₂o, without adding heat.

Explanation:

A physical change involves a change in physical form without altering the chemical composition. When salt (NaCl) dissolves in water, it is just dispersed in the water molecules and can be recovered by evaporating the water (boiling it off). No new chemical substances are formed. In a chemical change, new substances with different chemical properties are created.

Answer:

B. No, it is a physical change. It is salt and water and you can get the salt back by boiling off the water.