Author Question: A small bottle of perfume is opened and the scent quickly fills the air. By the next day, however, ... (Read 491 times)

jerry coleman · **on:** Aug 27, 2018

A small bottle of perfume is opened and the scent quickly fills the air. By the next day, however, the bottle is empty and the perfume can no longer be smelled.

Have the molecules in the perfume disappeared? Explain why the bottle is empty and why the perfume can not be detected.

Question 2

What prompted early scientists to propose that the ray of the cathode ray tube was actually a negatively charged particle?

A) The ray was present regardless of gas, or even without a gas.
B) The ray was attracted to positively charge electric plates.
C) The ray was not seen from the positively charged anode.
D) The ray could be diverted by a magnetic field.
E) The ray would change colors depending on which gas was used inside the tube.

frankwu0507 · **Reply #1 on:** Aug 27, 2018

Answer to Question 1

No, the perfume has not disappeared. Perfume is an example of matter so it is made up of submicroscopic particles. We can smell perfume because some of the particles enter our nose. Over time the bottle becomes empty as all of the particles leave the perfume and move into the air and spread out into the room. The perfume can no longer be detected because the individual particles in the air are too small to see and are too spread out to smell.

Answer to Question 2

B