Which is an example of conduction? Soup is warmed in a microwave oven. A hand is burned when touching a pot handle. Air above an ocean warms up and rises. A stone gets hot from sitting outside on a sunny day.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.