A substance made up of atoms of two or more different elements joined by chemical bonds
The number of protons in the nucleus of an atom
the sum of the number of neutrons and protons in an atomic nucleus
Atoms of the same element that have different numbers of neutrons.
The breakdown of a radioactive element, releasing particles and energy
Length of time required for half of the radioactive atoms in a sample to decay
sharing of electrons
Formed when one or more electrons are transferred from one atom to another
A molecule that has electrically charged areas.
A substance that increases the hydrogen ion concentration of a solution.
A substance that decreases the hydrogen ion concentration in a solution.
Law of Conservation Matter
matter can not be created or destroyed, only changed
a compound that does not have both hydrogen and carbon
Compounds that contain carbon
a kind of radiation including visible light, radio waves, gamma rays, and X-rays, in which electric and magnetic fields vary simultaneously.
The energy of motion
The SI unit of energy
the rate at which work is done or energy is transformed
First Law of Thermodynamics
the branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy
Second Law of Thermodynamics
The Second Law of Thermodynamics states that the state of entropy of the entire universe, as an isolated system, will always increase over time. The second law also states that the changes in the entropy in the universe can never be negative.
Efficient energy use, sometimes simply called energy efficiency, is the goal to reduce the amount of energy required to provide products and services.
A measure of an energy's source's ability to do useful work.
Negative Feedback loop
Causes a system to change in the opposite direction from which it is moving
Positive Feedback loop
Causes a system to change further in the same direction.