1. 8/25 – Question of the Day
Why do you think we use SI units in science?

2. QUIZ TiME
Good luck!!
Testing positions

3. 8/26 Question of the Day
What are some ways you are preparing for the test?

4. 8/28 – Question of the Day
Why do you think we talk about electrolytes in our diet/supplements?

5. 8/28 – Question of the Day
Sodium, chloride, potassium, calcium and magnesium
Transmitting electrical impulses along nerves and for muscle contraction
“Bioelectrical” functions such as moving, heart-beating, thinking, and seeing

6. Chapter 4.1 Reactions in Aqueous Solutions Aqueous solutions 
Solution in which water is the dissolving medium

7. Chapter 4.1 Review: what is a solution?
Prefix – homo (same)
Review: what is a solution?
A homogenous mixture of 2+ substances
Substances of a solution
Solute
Solvent

8. Chapter 4.1
Nature of the H2O molecule
H+, O-
Overall neutral
Salt

9. Chapter 4.1
3 bulbs, 3 electrical circuits

10. Chapter 4.1
Conducting electricity = flow of electrically charged particles
Electrolytes  substance whose aqueous solutions contain ions (e.g. NaCl)
Nonelectrolytes  substance whose aqueous solutions do not contain ions (e.g. C12H22O11)
Solvation  ions surrounded by H2O molecules, prevented from recombining; disperse uniformly

11. Chapter 4.1
What would make an electrolyte stronger?

12. Chapter 4.1 Strong electrolyte = solute (almost) completely as ions
Weak electrolyte = solute (mostly) as neutral molecules
NOT THE SAME AS SOLUBILITY

13. Think about it…
Which solute will cause the light bulb in to glow more brightly:
CH3OH, NaOH or CH3COOH
NaOH

14. Chapter 4.1
Chemical equilibrium  relative numbers of each type of ion or molecule in reaction are constant over time