Do
Has mass takes up space, composed of any physical substance
Matter
Smallest unit or particle of an element
Atom
The basic building block of physical matter; cannot be broken down to a simpler substance
Element
The smallest unit of a group of elements that have bonded together
Molecule
Two or more atoms of elements that have bonded together
Compound
Chart organizing chemical elements that make up all matter; listed by atomic number and related groups
Periodic table
Physical or chemical characteristics of matter
Properties of matter
Changes that take place where the chemical bonds are not changed
Physical change
Changes that take place where the chemical bonds have changed
Chemical change
Chemical change - evidence is when heat is absorbed or released
Chemical reaction
Two or more substances in the same container, but not chemically bonded
Mixture
A mixture in which you can not see the different parts
Homogenous mixture
Positive electric charge and it is part of the nucleus of the atom
Protons
Mass of atom of a chemical element; relative to the number of protons & neutrons in the atom (mass number)
Atomic mass
A mixture in which you can see the different parts
Heterogeneous mixture
Negative electric charge; and it orbits around the nucleus
Electron
Number of protons in an atom & determines the chemical properties & its place on the periodic table
Atomic number
Columns in the periodic table
Group
Horizontal rows whose element has the same number of electron shells
Period
Has no electric charge & orbits outside the nucleus
Neutrons
Phase change directly from a solid to a gas
Sublimate
Heat energy that is absorbed
Endothermic reaction
Code for the chemical element
Chemical symbol
Heat energy that is released
Exothermic reaction
Creates a solid as a result of a chemical reaction
Precipitate