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

QUIZ TiME Good luck!! Testing positions

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

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

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

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

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

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

Chapter 4.1 3 bulbs, 3 electrical circuits

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

Chapter 4.1 What would make an electrolyte stronger?

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

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

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