1. Chemistry Review

2. 2 3 Particles Electron (e-)  outer shell Proton(p+)  nucleus Neutron (n 0 )  nucleus Atoms are the smallest part of matter

3. Elements are made of the same type of atoms 3

4. Molecules are made of more than one type of atom 4 NaCl (salt) C 6 H 12 O 6 (glucose) HCl (hydrochloric acid)

5. Probe: Is It Made of Molecules? Bread DNAprotons Cell membrane wateratomic nucleus Oil brain cellworm Proteinegg sugar Atomflowerblood Bacteriaairmushroom Electrons fruit cell nucleus Cloud milk seed Chromosome leaf skin

6. How many elements do you think are in this picture? Earth’s Crust = Al, Fe, Si Water = H, O Air = N, O Person = C, H, N, O, P, S

7. What is a Chemical Bond? Three students were discussing their ideas about chemical bonds. This is what they said: Jane: “I think a chemical bond is produced by a molecule. It is a substance made up of matter that holds atoms together.” Will: “I think a chemical bond is an attraction between atoms. It is not made up of mater.” Gabe: “I think a chemical bond is a structural part of an atom that connects it to other atoms? Who do you most agree with and why?

8. Chemical Bonds join atoms together 8 1. Covalent – when atoms share electrons1. Covalent Examples: Water Glucose carbon dioxide oxygen gas hydrogen gas

9. 2. Ionic Bonding 9 when atoms gain or lose electrons form compoundscompounds

10. Reactants vs. Products 10 Reactants (inputs)Products (outputs) Coefficients

11. Model Kits!!!! We will focus on Covalent bonding