Chemistry Chapter Two

Is anything that occupies space and has mass. it can be seen, smelled, and felt. three states: solid, liquid, and gas.

The capacity to do work, or to put matter into motion. the greater the work done, the more energy is used doing it.

The energy in action. movement of the tinest particles of matter (atoms) as well as in larger objects.

Stored energy, that is, inactive energy that has the potential, or capability, to do work but is not presently doing so. when potential energy is released, it becomes kinetic energy.

The form stored in the bonds of chemical substances.

Results from the movement of charged particles. electrical currents are generated when charged particles called ions move along or across cell membranes.

Energy directly involved in moving matter.

Energy that travels in waves. they vary in wave length, and include visible light, infrared waves, radio waves, ultraviolet waves and X-rays.

Unique substances that cannot be broken down into simpler substances by ordinary chemical methods. All matter is composed of these.

An oddly shaped checkerboard which provides a more complete listing of the known elements.

Building blocks of life. makes up all elements. comes from the greek word meaning "invisible."

A one- or two-letter chemical shorthand. usually the first letter of the elements name.

Contains protons and neutrons tightly bounded together. positively charged overall.

Bear a positive electrical charge

Neutral charge