3 Describe the difference between element and compound, and atom and molecule. Understand the various descriptions of matter.Understand the information in a chemical formula.KEY WORDSPure Mixture CompoundMolecule Heterogeneous HomogeneousDiatomic Chemical formula Subscript
4 Anything that has mass and takes up space, or volume. Matter:Anything that has mass and takes up space, or volume.
5 Pure substanceThe particles that make up a substance are all the same kind.MixtureSubstance contains more than one kind of particle.
7 ElementsThe simplest form of a material; an atom is the smallest particle of an element.CompoundsThe simplest form of any material containing two or more elements chemically bonded together.A molecule is the smallest particle of a compound.
8 Element:Silver– all atoms are pure silver.Compound:Salt – all molecules are pure sodium chloride.Possible to have a molecule of the same atoms:Oxygen gas – O2Hydrogen gas – H2Molecules like this are diatomic – “two atoms.”