2: NSCI pls
We mix 51 grams of oxygen gas with
21 grams of argon gas in a volume of 1593 mL
at –14°C. What will be the final pressure of
the gas mixture?
Answer in units of atm.

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

where are the choice options?

the dissolution of polymer can be thermodynamically described in 2 steps.