1. - + Sodium atom (Na) Chlorine atom (Cl) Sodium Chloride NaCl
Sodium ion (Na+)
Chlorine ion (Cl-)

2. CLASSIFYING MATTER

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 WORDS
Pure Mixture Compound
Molecule Heterogeneous Homogeneous
Diatomic 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 substance
The particles that make up a substance are all the same kind.
Mixture
Substance contains more than one kind of particle.

7. Elements
The simplest form of a material; an atom is the smallest particle of an element.
Compounds
The 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 – O2
Hydrogen gas – H2
Molecules like this are diatomic – “two atoms.”

10. Heterogeneous mixture
Particles are not evenly distributed.
Individual particles can be found.
Sand and water
Pizza

11. Homogeneous mixture
Particles of are evenly distributed – “solution”
Cannot easily separate different parts.
Salt and water
Coke

12. All matter is either pure or a mixture.
Pure matter - elements (atoms) or compounds (molecules).
Mixtures - homogenous (joined) or heterogeneous (separate).
Homogenous mixtures are called “solutions”