Matter
anything that has mass and takes up space
Substance
A single kind of matter that is pure meaning that it always has a specific makeup and has a specific set of properties
Chemical Property
A characteristic of a pure substance that describes its ability to change into different substances; Can't be see without changing a substance into a new substance
Atom
the basic particle from which all elements are made
Molecule
groups of two or more atoms held together by chemical bonds. Can be 2 of the same atoms or 2 + different atoms
Chemical Formula
A combination of symbols that represents the elements in a compound and the ratio of atoms.
Heterogeneous Mixture
a mixture in which you can see the different parts and materials are mixed unevenly
Homogeneous Mixture
a mixture where you can't see the different parts and materials are mixed evenly
Solution
a well-mixed mixture (containing a solvent and at least one solute that has the same properties throughout)
ex. salt water
Chemistry
the study of the properties of matter and how matter changes
Physical Property
A characteristic of a pure substance that can be observed without changing matter into another substance; used to classify matter
Element
a pure substance that cannot be broken down into other substances by chemical or physical means
Chemical Bond
the force that holds two atoms together; the force of attraction between 2 atoms
Compound
a pure substance made of two or more elements chemically combined in a set ratio
Mixture
made up of two or more substances, elements, or compounds or both, that are mixed together but not chemically combined