1. ATOMS and Molecules

2. ESSENTIAL QUESTION
How do we distinguish between atoms and molecules?

3. Definition of ATOM
is the smallest particle into which an element can be divided and still be the same substance

4. What is an Element?
Definition of Element: A substance that cannot be broken down into other substances by chemical or physical means.

5. WHAT’S THE BIG IDEA??
Atoms are composed of small particles that determine the properties of the atom.
There are three types of subatomic particles:
Neutron – neutral charge; holds the protons in the center of the atom (nucleus); largest
Proton -- positively charged particles; determines the identity of the element;
Electron – negatively charged particles; smallest; rapidly move around the nucleus

6. WHAT IS AN ATOM MADE OF?

7. Molecules are very small objects that are made up of connected atoms
What are Molecules?
Molecules are very small objects that are made up of connected atoms

8. What Do Molecules Look Like?
Molecules can take on all kinds of different shapes and sizes
Let’s look at a few!

9. Water H H O
H2O

10. Air
Nitrogen N
Oxygen O

11. Sugar
C6H1206

12. Salt (Sodium Chloride) Sodium with water video
NaCl

13. It depends on whether they are in a solid, liquid, or gas
Do Molecules Move?
Yes, they do!
How do they move?
It depends on whether they are in a solid, liquid, or gas

14. IDENTIFYING SUBSTANCES
ATOM – smallest unit of an element that maintains the properties of that element. EX: O
MOLECULES – any two or more joined atoms that are the same or different
COMPOUNDS – two or more different atoms that are joined EX: NaCl

15. Copy the chart and put a under the appropriate column(s).
SUBSTANCE
MOLECULE
COMPOUND
HCl

16. Molecule Activity
1. Water
2. Carbon Dioxide

17. Molecule Activity
3. Ammonia
4. Methane