What will happen to sun if the concentration of nitrogen, oxygen and carbon increases to 97 % and hydrogen and helium decreases by 3 %? Can we still call it a star?

No.

Explanation:

If the concentration of nitrogen, oxygen and carbon increases to 97 % and the concentration of hydrogen and helium decreases by 3 %, then it is not considered as a star, it will be called a planet just like earth. The higher concentration of hydrogen and helium are responsible for the luminous characteristics of stars such as sun so if the concentration changes, the luminous intensity decreases that leads to formation of planet.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

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