1. Before the Bell Rings New Seats! Grab 1 Paper from the side table
One person in each two person group log onto the computer at your table.
Have your “Like Dissolves Like” WS out to check.

2. ETD#46 1. Solute(s) 2. Solvent(s) 3. Solution(s)
In a pitcher of Kool-aid, what is/are the:
1. Solute(s)
2. Solvent(s)
3. Solution(s)
How can you tell if the solution is saturated with sugar?

3. ETD#46ANS Solute – thing being dissolved (sugar, Kool-Aid)
Solvent – thing doing the dissolving (water)
Solution – homogenous mixture of the solute plus solvent
Saturated – no more sugar dissolves.

4. Learning Targets
I can use scientific vocabulary to correctly describe solutions.

5. Polar vs Non-Polar: How do you know?
Quick Way:
Just C & H: Non-Polar.
Ex: C3H8, CH4
Just one Element: Non-Polar.
Ex: O2, H2
H’s and O’s (or H’s and N’s): Polar
Ex: C6H12O6, H2O, NH3
More Accurate Way:
Draw the Lewis Dot Structure.
Tetrahedral / linear = non-polar
Ex: CH4 , CO2
Bent / trigonal pyramidal = polar
Ex: H2O, NH3

6. Factors that affect the rate of dissolving
Expose greater surface area
Stir
Heat
Polarity
Why do each of these affect the rate of dissolving?

7. Dissociating = Breaking into Ions

8. Soluble vs. “Insoluble”
NOTES
Soluble vs. “Insoluble”
Soluble = Dissolvable
Easily Dissolves in Water.
Likes Water More Than Other compds
Will NOT form a precipitate
More Attracted to water
“Insoluble” = Partially Soluble
Barely Dissolves in Water,
Likes Water less than other compds.
Forms a precipitate
Less attracted to water

9. Salt Dissociating

10. Qualitatively describing the concentration of a solution …
Unsaturated - more solute can be dissolved in the solution
Saturated – no more solute can be dissolved in solution

11. Supersaturated
A solution that contains more dissolved solute than it should at a temperature (very unstable – will become saturated if there’s something to connect around) g pk
***SAVE UNTIL TEMP / SATURATION NEXT YEAR?***
3.5 g of Sodium Acetate * 3H2O per mL used.
e.g. 175 g / 50 ml
Or 105 g / 35 ml
Neil: 50g / 5 mL

13. PhET – Soluble Salts Go to the site on the handout.
Work with your elbow partner.
There are words you may not know on the handout.
Look them up online.
Look them up in a chem book.

14. What didn’t the model show?

15. Why does salt easily dissolve in water?
What doesn’t PhET Show?
Why does salt easily dissolve in water?
Water and Salt are both “polar” and attracted to one another
Like Dissolves Like!
H2O goes in the “spaces” and “dissolves” the NaCl into ions
Na+ and Cl-Ions Dissociate and stay surrounded by water.
How is this different for polar and non-polar molecules?

16. Learning that vocab…

17. Learning Targets
I can use scientific vocabulary to correctly describe solutions.

18. Homework
1. Phet Salts and Solubility- Due next class.