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 is a change in which no new substances are formed. When salt dissolves in water, it is a physical change because the salt can be recovered by boiling off the water. In a chemical change, new substances are formed through a chemical reaction. Here, salt and water do not react chemically to form new substances.

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