An amount of nitrogen undergoes a physical cha ange and increases its volume. What can be known about this physical
change?
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The boiling point of the nitrogen increased
The mass of nitrogen increased
The color changed
The density changed

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