If common names does not exist how would be the world of organic compounds​

Particles vibrate in a rigid structure and do not move relative to their neighbors.

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

When the mercury level in a barometer decreases that atmospheric pressure has