1. Today’s Special http://mlb.mlb.com/allstar-teachers/
Secret lives of students
HW check-Vocab 22
Test results
Notes 22
HW I due next time
Atomic size
Part II

2. 22 Mixtures
PAc.1: Distinguish chemical properties of matter (including reactivity) from physical properties of matter (including boiling point, freezing/melting point, density [with density calculations], solubility, viscosity, and conductivity).
PAc.4: Classify matter as a pure substance (either an element or a compound) or as a mixture (either homogeneous or heterogeneous) on the basis of its structure and/or composition.
PAc.5: Explain the effects of temperature, particle size, and agitation on the rate at which a solid dissolves in a liquid.

3. You can’t build a reputation on what you’re going to do.
Henry Ford
Fact: The liquid inside young coconuts can be used as a substitute for blood plasma.

4. Mixture
A combination of two or more substances in which each substance retains its properties
Air is a mixture of nitrogen, oxygen, carbon dioxide and other gases
Tap water is a mixture of water, minerals, and gases

5. Separating mixtures Filtration – use of filters to remove particulates
Distillation – using heat and differences in boiling points to separate liquids

6. Purity
A pure substance contains only a single element or compound

7. Heterogeneous/homogeneous
Heterogeneous – components can be seen as individual substances; i.e. sand in water
Homogenous – same composition throughout; solutions and suspensions

8. Solution/suspension Solution - all components in the same phase
Suspension – components are in different phases, like Coke

9. Dissolving
Solvent – the component in a solution of the greatest amount
Solute – component dissolved in solvent

10. solution Unsaturated – can still dissolve more solute
Saturated – has reached the limit on the amount of solute that can dissolve
Super-saturated – solution has been “tricked” into holding more solute than is normally possible

11. SUPERSATURATED SOLUTION
SUPERSATURATED SOLUTIONS ARE UNSTABLE AND ARE NOT IN A STATE OF DYNAMIC EQUILIBRIUM.
A SUPERATURATED SOLUTION WILL CRYSTALLIZE IF DISTURBED OR SEEDED BY A SEED CRYSTAL.
SLOW CRYSTALLIZATION FROM A SLIGHTLY SUPERSATURATED SOLUTION CAN PRODUCE LARGE AND VERY PURE CRYSTALS
RAPID PRECIPITATION FROM A QUICKLY FORMED SUPERSATURATED SOLUTION OFTEN FORMS SMALL AND IMPURE CRYSTALS

12. mole A “chemist’s dozen”
6.02 x 1023 items; molecules, atoms, electrons, etc.

14. molarity
Moles of solute per liter of solvent

15. Homework Read chapter and define vocabulary by next class.
Chapter HW: pp
I. Review questions2-16 even (due date: ____________)
II. Exercises 2-16 even (due date: __________)

16. Today’s special In the heavens HW check; Q & A
Super-saturated solutions
Labs: Hypothesis & Conclusion
Nuclear reactions revisited
Solid vs. Liquid

17. Today’s special Turn in Lab on front table Nuclear reactions revisited
Refining Iron
Liquid nitrogen
Lab II
HW II due next time
Solid vs. Liquid

18. Today’s special HW check; Q & A Science news
Interactive periodic table
Hot/Cold mixing demo
Practice test (Enter answers in Smart response, write sentences & essays for next time)
Test next time!

19. Today’s special Turn in practice test on front table
Test 22: Answer MC in Smart response; turn in paper test with support sentences & Essays on front desk
Vocab 23 due next time!