Questions about example sentences with, and the definition and usage of "Perez"

A: "Emphasis" means high energy. "Emphatic" and "emphatically" mean doing something with a lot of energy.

"Thump" is an onomatopoeia for a deep, heavy sound when something is hit. If I grab a pillow and hit someone with it, the pillow will sound like "thump, thump, thump."
"Palm" is the center part of the hand.
"Arm of the chair" means the armrest, the place where you rest your arms.

So! The full sentence means:

"With lots of energy, Perez hit the armrest of his chair with his hand, and it made a thump sound."

A:

Good job!