Question

(-) saliva breaking down a piece of bread

(+) a piece of avocado turning brown
Select all that apply.
a. Both are only physical changes.
b. Both are caused by heating.
c. Both are chemical changes.
d. Both are caused by cooling.

Answer 1

Both the saliva breaking down a piece of bread and the browning of avocado are examples of chemical changes.

Step-by-step explanation:

Both the saliva breaking down a piece of bread and a piece of avocado turning brown are examples of chemical changes.

Saliva contains enzymes that break down the starches in bread into simpler sugars, which is a chemical change. The browning of avocado occurs due to the oxidation of certain compounds in the avocado, which is also a chemical change.

Therefore, options c) Both are chemical changes apply to both scenarios.