A small quantity of the inert gas argon is added to incandescent light bulbs to reduce vaporization of tungsten atoms from the solid filament. If the light bulb has a volume of 0.21L and a pressure of 1.30mmHg, what volume of argon gas is needed to fill the bulb at a pressure of 760 mmHg? Assume the argon gas temperature remains constant. Just putting this out there for other students.

0.0004L

The attached picture shows how I got the answer.

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

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.