1. Do Now
Which list of elements consists of a metal, a metalloid, and a nonmetal?
Li, Na, Rb
Cr, Mo, W
Sn, Si, C
O, S, Te
The elements in Group 2 are classified as
Metals
Metalloids
Nonmetals
noble gases

2. Atomic Bonding Williamsburg High School for Architecture and Design
Mr. Quinn and Ms. Tom
11/6/13

3. Aim
How are compounds and elements different?

4. What are some chemicals you have used?
You can’t find most of these on the periodic table!
They are compounds

5. Compound vs. Element
An element is a pure form of an atom (and nothing else)
A compound is a pure substance made of 2 or more elements

6. Properties Elements and compounds have different physical properties
Melting point, boiling point, etc.
Elements and compounds have different chemical properties
Reactivity, solubility, etc.

7. Types of Compounds
Salt: a metal and a nonmetal combined
Molecule: two or more nonmetals combined

8. Examples

9. Examples

10. Examples

11. Examples

12. Compounds in Architecture
The Statue of Liberty is made of copper
Over time, various compounds have built up, turning it green
These compounds also protect it!

13. Compounds in Architecture
Iron and oxygen combine to form iron oxide
More commonly known as rust!

14. Why do you think compounds have different properties from elements?

15. How can we recognize compounds vs. elements?
For elements we write the atomic symbol
Al, Fe, C, F, Ne
For compounds, the symbol and number of all elements are written
Water is…
H2O
Sugar is…
C6H12O6
Salt is…
NaCl

16. Practice, Round 1
Which of the following is a compound? Na C
H2O Xe

17. Practice, Round 2
Organize the following compounds into “salt” or “molecule”
H2O
NaCl
CaO
CH4
H2SO4
KBr