Polar molecules, like water, result when electrons are _____.

The subatomic particle responsible for the chemical behavior of an atom is the _____.

An isotope is an atom that varies in the number of _____, giving it a heavier or lighter atomic weight. 

_____ is the most common element in the human body. 

When our body temperature rises above 98°F or 37°C, a feedback mechanism is triggered to lower body temperature.  As a result, sweat is released to cool the body.  The sweat gland is the _____ of a feed back loop.

Match the example equation to its reaction type. Each answer is used only once.

_____ is necessary for diffusion to take place. 

Water is _____.

Hydrogen atoms often lose an electron from the valence shell to form H+. In this ionic form, _____ electrons are in the valence shell of hydrogen.

The anatomical term that best describes a structure that is closer to the origin is _____.