Friday, 10/27

1. Compounds and Elements Atomic, molecular, and network matter Chemical formulas Molecular families and bonding geometries Instrumentation Friday, 10/27

2. Compounds and Elements Atomic, molecular, and network matter Chemical formulas Molecular families and bonding geometries Instrumentation (?) The wave model tells us what atoms are like We can understand how atoms bond These bonds are a major part of our daily experience. Our lives are governed largely by chemistry Friday, 10/27 Why we’re doing this

3. 10/27 Atoms molecules and networks 10/30 Reactivity 11/1 Bonding in metals and semiconductors 11/3 Ionic bonds 11/6 Covalent bonds 11/8 Some applications The wave model tells us what atoms are like We can understand how atoms bond These bonds are a major part of our daily experience. Our lives are governed largely by chemistry Our approach Why we’re doing this

4. (Participation question)Which of these is a compound? • Hydrogen • Neon • Nitrogen • Water Compounds: matter that contains two or more atoms in a fixed, definite proportion. Sulfuric acid, hydrogen peroxide, salt, sugar, bleach, sodium bicarbonate, etc.

5. (Participation Question)What is the difference between a pure substance and an element? • They are the same thing • Pure substances have a defined, unchanging chemical composition, but elements are just one kind of atom. • Elements have a defined, unchanging chemical composition, but pure substances are just one kind of atom.

6. Chemical Matter

7. Atomic Matter: The noble gases Simple atoms in solid, gas, and liquid state Chemical Matter “I told you they’s organized”

8. Definite molecules in solid, liquid, and gaseous states Atomic Matter: The noble gases Simple atoms in solid, gas, and liquid state Molecular matter “I told you they’s organized”

9. Definite molecules in solid, liquid, and gaseous states Extended bonding, no distinct molecles. Metals, salt, quartz, etc. Molecular matter Network matter

10. molecular atomic molecular network Can you tell how bonding influences melting and boiling temperatures?

11. (Participation question)How many hydrogen atoms:H2O • 1 • 2 • 3 • 4 • 5

12. (Participation question)How many hydrogen atoms:2C2H4 • 2 • 4 • 6 • 8 • 10

13. The family of simple hydrocarbons http://ps100.byu.edu/molecule_sg/simple_hydrocarbons.html

14. Electrons in molecules have NEW standing wave descriptions Sometimes we talk about shared pairs of electrons Molecular Orbitals

15. Electrons in molecules have NEW standing wave descriptions Sometimes we talk about shared pairs of electrons Molecular Orbitals Molecules vibrate

16. Molecular vibration can be caused by photon absorption Infrared Absorption Molecules vibrate

17. Molecular vibration can be caused by photon absorption Infrared Absorption Molecules break

18. Measure molecular fragments to determine the original molecule Mass Spectroscopy Molecules break

19. Measure molecular fragments to determine the original molecule Some molecules can be formed into crystals Crystal form and content determined by x-ray scattering Mass Spectroscopy Molecules crystallize