Answer:
1. 1795, that's when they were also invented
2. a gray crystalline allotropic form of carbon which occurs as a mineral in some rocks and can be made from coke. It is used as a solid lubricant, in pencils, and as a moderator in nuclear reactors.
3.The second graphite grading scale is known as the HB scal
4. As the concentration of hydrogen ions in a solution increase, the more acidic the solution becomes. ... Thus, as the hydrogen ion concentration increases hydroxide ion concentration falls, and vice versa.
Answer:
Answer: D
Explanation: Eastman Kodak created a camera and film development process in the late 1800s/early 1900s that made it possible for the public to take pictures on their own.
