Atoms, compounds, and mixtures (oh my!)

Catalyst (Left Page):
1. What are some examples of physical properties?
2. What are some examples of chemical changes?
3. How do scientists classify types of matter?

Objectives
 Identify differences between:
 atoms and molecules
 elements and compounds
 pure substances and mixtures

Classification of Matter 10.21.2008

Objectives
 Identify differences between:
 atoms and molecules
 elements and compounds
 pure substances and mixtures

 The word atom comes from the Latin word atomos , which means
“indivisible.”
 This is the smallest particle of matter which has its own identity.
 We will represent the entire atom as one circle.

Atom
Classification of Matter 10.21.2008
-Smallest part of matter with its own identity
- Represented as a circle


The word molecule comes from the Latin word molecula , which means “tiny.”
 This is any particle which is made of two or more atoms .

Atom
Molecule
Classification of Matter 10.21.2008
-Smallest part of matter with its own identity
- Represented as a circle
- Particle made of 2 or more atoms

Objectives
 Identify differences between:
 atoms and molecules
 elements and compounds
 pure substances and mixtures

 An element is made of only one type of atom .
 Each element has unique physical. & chemical properties

An atom is always considered an element .

Certain molecules are elements , too.

Atom
Molecule
Element
Classification of Matter 10.21.2008
-Smallest part of matter with its own identity
- Represented as a circle
- Particle made of 2 or more atoms
- Unique phys. & chem. Properties
- Made up of only 1 type of atom


A compound is made from two or more different elements .

All compounds must therefore be molecules .

Atom
Molecule
Classification of Matter 10.21.2008
-Smallest part of matter with its own identity
- Represented as a circle
- Particle made of 2 or more atoms
Element
Compound
- Unique phys. & chem. Properties
- Made up of only 1 type of atom
- Made of 2 or more elements
- All compounds are molecules

Objectives
 Identify differences between:
 atoms and molecules
 elements and compounds
 pure substances and mixtures


Every particle in a pure substance is identical
(exactly the same.)
 A pure substance can either be an element or a compound .

Atom
Molecule
Classification of Matter 10.21.2008
-Smallest part of matter with its own identity
- Represented as a circle
- Particle made of 2 or more atoms
Element
Compound
- Unique phys. & chem. Properties
- Made up of only 1 type of atom
- Made of 2 or more elements
- All compounds are molecules
Pure
Substances
- Every particle is identical/same
- Can be element OR compound


A mixture has at least one particle that is not like the others.

For now, we will classify mixtures according to their particles.

This gives us three choices:

 mixture of elements
 mixture of compounds
 mixture of both elements and compounds a

 mixture of elements
 mixture of compounds
 mixture of both elements and compounds

 mixture of elements
 mixture of compounds
 mixture of both elements and compounds

Element
Compound
Classification of Matter 10.21.2008
- Unique phys. & chem. Properties
- Made up of only 1 type of atom
- Made of 2 or more elements
- All compounds are molecules
Pure
Substances
- Every particle is identical/same
- Can be element OR compound
Mixtures - at least one particle NOT the same
- mixtures with: elements, compounds, elements and compounds


Take a minute to draw an example of each of the following (using color ):
1. Atom
2. Molecule
3. Element
4. Compound
5. Pure Substance
6. Mixture

Practice Problems
1. Draw a compound which has a total of four particles and four atoms per particle.
2. Draw a mixture of elements which is made of three individual atoms and two molecules which have three atoms per particle.
3. Draw a mixture of compounds which is made of four compounds which have two atoms per particle and two compounds which have three atoms per particle.