Students are each given a 20-gram sample of an unknown solid compound in a clear plastic bag. They are instructed to break the material into smaller parts by gently hitting it with a hammer. Some of the parts break into large chunks and some look like a fine powder. Which statement correctly describes these broken pieces of the sample?
The fine powder pieces are individual atoms broken from the solid.
The larger pieces are still compounds and the smaller pieces are elements.
Each piece contains the same number of atoms.
Each piece contains the same proportion of different elements.

Explanation:

The fight-or-flight reaction (further described hyperarousal, or the acute stress rejoinder) is a physiological response that transpires in reply to a recognized adverse effect, assault, or warning to survival. It was originaly reported by Walter Bradford Cannon.

The autonomic nervous system has two elements, the sympathetic nervous system and the parasympathetic nervous method. The sympathetic nervous system works same as a gas accelerator in a car. It triggers the fight-or-flight reaction, giving the body with a rupture of strength so that it can react to recognized hazards.