[17]. trimix 10/50 is a gas mixture that contains 10% oxygen and 50% helium, and the rest is nitrogen. if a tank of trinix 10/50 has a total pressure of 2.07 x 10^4 kpa, then what is the partial pressure of nitrogen?
a). 1.04 x 10^4 kpa
x b). 8.3 x 10^3 kpa
c). 2.07 x 10^3 kpa
d). 2.07 x 10^4 kpa

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