20 POINTS What is taking place in a reaction as the curve on a reaction pathway graph goes up?
Heat is being released.
Heat is being absorbed.
The reaction has stopped.
The reaction is slowing down.

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.