1. Intro movie Topic: Intro to Bonding Do Now: 1.Pick up a new unit packet – Test will be on Dec. 16 2.Begin filling in p.3 3.I will be coming around to check Review Book Assignment 1, don’t forget you have a Review Book Assign due every day this month!

2. Intermolecular Forces betweenAttractive forces between molecules Determine phase at room temperature 3 kinds: –Dispersion –Dipole-dipole –Hydrogen bonding withinThese are much weaker than forces within a molecule

3. Intramolecular Force – forces within a molecule A chemical bond is the force that holds two atoms together Due to electrostatic forces (charges) Bonding: 1. ionic bonding: 1. ionic bonding: metals and nonmetals 2. covalent bonding: 2. covalent bonding: nonmetals and nonmetals 3. metallic bonding: 3. metallic bonding: metals and metals

4. So why do atoms bond?! Atoms attain a stable valence electron configuration by bonding with atoms. All atoms want to be like Noble Gases because they have a stable valance electron configuration (a full octet)

5. What Noble Gases tell us: notDo not form compounds under ordinary conditions stable –= extremely stable 8 valence electrons = great stability8 valence electrons = great stability –also low energy!

6. Octet Rule: Why Bonds Form noble gasGoal: achieve noble gas electron config. - want 8 valence electrons (H wants a total of 2) Why: Low energy, high stability state How: Atoms form bonds by: gaining losing, or sharing electrons

7. 3 Types of Bonding IonicIonic: electrons are transferred CovalentCovalent: electrons are shared MetallicMetallic: “sea of mobile electrons”

8. Energy & Chemical Bonds Making a bond Releases energy! It’s exothermic!

9. Energy & Stability Low Energy means High Stability High Energy means Low Stability HINCE MY WALL… KEEP CALM (stable) AND FORM A BOND (it releases energy)

10. A + B  AB + energy bond is formed: energy is released -AB has less PE than A and B -AB is more stable than A and B The greater the energy released when the bond is formed, the more stable the bond is K + L  KL + 400 Joules Reaction2 B + C  BC + 100 Joules Reaction1 Which product is more stable, BC or KL?

11. Energy, Charge and Mass are Conserved in Chemical reactions (when bonds are formed or broken)

12. Stability in Chemical Systems If it exists, its stable! Of course, some things are more stable than others!

13. Quick Quiz Elements in the same column have the same ____________________________. number of valence electrons Elements with the same number of valence electrons have similar _____________________________. chemical properties