CH 101 Lecture Notes - Lecture 7: Cathode Ray, Electric Field, Cathode Ray Tube

• School: University of Alabama
• Department: Chemistry
• Course: CH 101
• Professor: John Mc Duffie

Document Summary

Gerd bennig and heinrich roher found that as you pass a sharp metal tip over a flat metal surface, the amount of current that flows varies with the distance between the tip and the surface. Movement of tip is used to create an image with atomic resolution. Later scientists found that not only can you see the atoms on the surface, but the instrument allows you to move individual atoms across the surface. Some early philosophers believed that matter had an ultimate, tiny, indivisible particle. Other philosophers believed that metter was infinitely divisible. Because there was no experimental way of proving who was correct, the best debater was the person assumed correct. In the late 17th century, the scientific approach to understanding nature became established. For the next 150+ years, observations about nature were made that could not easily be explained by the infinitely divisible matter concept. In a chemical reaction, matter is neither created nor destroyed.