5- perfume sprayed in the air
6- I'm really sorry but I'm not sure
I think quantitative observations involve numerical descriptions relating to an object while qualitative observations involve non-numerical descriptions of an object.
In this case the object is a hailstone so quantitative observations would be things such as its volume, mass, weight, temperature, and so on. Qualitative observations would be things like its color, texture, general shape, and so on.
I hope this helps. Let me know if anything is unclear.
Hope this helps
U can ask any doubt if u have
Answer:
the correct answer is CO2 (the last one)