matter
anything that has mass and takes up space
mass
a measure of the amount of matter in an object
volume
the amount of space that an object takes up, or occupies
density
The amount of space something takes up
solid
the state of matter in which the volume and shape of a substance are fixed
liquid
the state of matter that has a definite volume but not a definite shape
gas
a form of matter that does not have a definite volume or shape
change of state
the change of a substance from one physical state to another
thermal energy
the total kinetic energy of a substance’s particles
Temperature
a measure of how hot (or cold) something is; specifically, a measure of the average kinetic energy of the particles in an object
pressure
the amount of force exerted per unit area of a surface
element
a substance that cannot be separated or broken down into simpler substances by chemical means
atom
the smallest unit of an element that maintains the properties of that element
periodic table
a chart that organizes all known chemical elements
pure substance
a sample of matter, either a single element or a single compound, that has definite chemical and physical properties
chemical bond
a strong force that holds atoms together
molecule
a group of atoms that are held together by chemical forces; a molecule is the smallest unit of a compound that keeps all the properties of that compound
compound
a substance made up of atoms of two or more different elements joined by chemical bonds
