Which one of these is an example of a physical change? a. sugar dissolving in warm water. b. iron rusting in the presence of moist air. c. wood burning in the presence of oxygen. d. baking soda reacting with acid to form with acid to form a gas.

Hey there!

The correct answer to your question is option A.

Sugar dissolving in warm water is an example of a physical change.
This is because sugar dissolving in the water does not create a substance or material. All of the other options are examples of chemical changes, because they eventually become a substance/material.

Hope this helps you.
Have a great day!

Hey how did you manage to type such a big lab report