Assertion – While writing chemical equations, hydrogen, oxygen, nitrogen and chlorine are written in molecular form. Reason – The valency of the hydrogen and chlorine is 1, oxygen is 2 and nitrogen is 3

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.