Given that the radiusof anion a2- is 0.290 nm, what would you expect the radius of a and a2+ to be

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

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.