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. “that’s 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 is a change in which no new substances are formed. When salt dissolves in water, it is a physical change because we can recover the salt by boiling off the water, meaning the salt and water retain their chemical identities. A chemical change would involve the formation of new substances with different chemical properties.

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.