1. Compounds

2. Compounds
Substance formed by the chemical combination of two or more elements in definite proportions
Example: WATER!
Water is NOT an element! Made up of 2 elements!!

3. CaCO3 Calcium carbonate How many atoms of calcium?
How many atoms of carbon?
How many atoms of oxygen?

6. Let’s check your bellringer

7. Almost all elements exist in a compound form.

8. MOLECULE Structure that results when atoms join together.
Smallest unit of most compounds.

9. Why do compounds form?
Stability

10. Valence electrons = electrons in the outermost ring

11. Periodic table is organized according to reactivity…or the # of valence electrons

13. In order to be stable, the outermost electron ring must be completely filled.

18. Atoms in compounds are held together by bonds.

19. Let’s make one of the most prevalent compounds in your body!

20. Bond Types
There are two types of bonds:
Ionic
Covalent

21. Remember… Why do atoms bond in the first place?
What is the key subatomic particle involved in bonding?

22. What is going on in each picture
What is going on in each picture? Which picture would best match IONIC BONDS? Which picture would best match COVALENT BONDS? A B

23. Ionic Bonds
Formed when one or more electrons are transferred from one atom to another. (ions)
The resulting oppositely charged ions are attracted to each other – forming the bond

24. Covalent Bonds
Forms when electrons are shared between atoms.

25. Covalent Bonds
Most commonly found bond in compounds that make up living things.