1. 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?

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

3. Classification of Matter 10.21.2008

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

5. atom
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.

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

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

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

9. atom or molecule?

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

11. element 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.

12. Classification of Matter 10.21.2008
Atom
Molecule
Element
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

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

14. Classification of Matter 10.21.2008
Atom
Molecule
Element
Compound
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
Made of 2 or more elements
All compounds are molecules

15. element or compound?

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

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

18. Classification of Matter 10.21.2008
Atom
Molecule
Element
Compound
Pure Substances
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
Made of 2 or more elements
All compounds are molecules
Every particle is identical/same
Can be element OR compound

19. mixture
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:

20. mixture mixture of elements mixture of compounds
mixture of both elements and compounds a

21. mixture mixture of elements mixture of compounds
mixture of both elements and compounds

22. mixture mixture of elements mixture of compounds
mixture of both elements and compounds

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

24. pure substance or mixture?

25. Processing (Left Page)
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

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