November 13, 2013 Once you’re in, you’re in November 13, 2013 Once you’re in, you’re in. When the bell rings, electronics and headphones away working on the Do Now (half sheet you picked up). You have until 5 minutes after the bell until this is collected. TURN IN SOLUTIONS ANTICIPATION GUIDE (ONLY THE GUIDE NOT THE READING). TURN IN ANY LATE STEM PROJECT ASSIGNMENTS AND ANY LATE HW.

Tutoring Thursday afterschool in 710 (2:30-3:30pm) – will not be available Wednesday Lunch A

Homework 11-13-13 Vocabulary column #1 ** Assignment #10 **graded

Objective SWBAT Summarize properties of solutions

Video Expectation : Take bullet point notes, what you think is the most important (8-10 bullet points) Be prepared to share http://www.youtube.com/watch?v=AN4KifV12DA

Solids, Liquids, Gas mini-poster – 15 minutes SIX groups Intermolecular forces (define and explain their role) Description of phase (volume, shape, state it is found) Draw a picture indicating how particles are packed for the state you are researching List difference types and give an example

Classification of Matter Solutions are homogeneous mixtures

Solute Solvent A solute is the dissolved substance in a solution. Salt in salt water Sugar in soda drinks Carbon dioxide in soda drinks Solvent A solvent is the dissolving medium in a solution. Water in salt water Water in soda

“Like Dissolves Like” Nonpolar solutes dissolve best in nonpolar solvents Fats Benzene Steroids Hexane Waxes Toluene Polar and ionic solutes dissolve best in polar solvents Inorganic Salts Water Sugars Small alcohols Acetic acid

Solubility Trends The solubility of MOST solids increases with temperature. The rate at which solids dissolve increases with increasing surface area of the solid. The solubility of gases decreases with increases in temperature. The solubility of gases increases with the pressure above the solution.

Therefore… Solids tend to dissolve best when: Heated Stirred Ground into small particles Gases tend to dissolve best when: The solution is cold Pressure is high

Solubility Chart

Definition of Electrolytes and Nonelectrolytes An electrolyte is: A substance whose aqueous solution conducts an electric current. A nonelectrolyte is: A substance whose aqueous solution does not conduct an electric current.

Electrolytes vs. Nonelectrolytes The ammeter measures the flow of electrons (current) through the circuit. If the ammeter measures a current, and the bulb glows, then the solution conducts. If the ammeter fails to measure a current, and the bulb does not glow, the solution is non-conducting.

Try to classify the following substances as electrolytes or nonelectrolytes… Pure water Tap water Sugar solution Sodium chloride solution Hydrochloric acid solution Lactic acid solution Ethyl alcohol solution Pure sodium chloride

Answers to Electrolytes NONELECTROLYTES: Tap water (weak) NaCl solution HCl solution Lactate solution (weak) Pure water Sugar solution Ethanol solution Pure NaCl

Foldable Lavender paper Solution = Solute + Solvent

Solution = Solute + Solvent Solute - gets dissolved Solvent - does the dissolving Aqueous (water) Tincture (alcohol) Amalgam (mercury) Organic Polar Non-polar Solutions are always homogeneous – evenly mixed. Solutions – In all solutions, whether gaseous, liquid, or solid, the substance present in the greatest amount is the solvent, and the substance or substances present in lesser amounts are the solute(s). – Solute does not have to be in the same physical state as the solvent but the physical state of the solvent determines the state of the solution. – If solute and solvent combine to give a homogeneous solution, solute is said to be soluble in the solvent. The difference between hydrophilic and hydrophobic substances has substantial consequences in biological systems. – Vitamins can be classified as either fat soluble or water soluble. 1. Fat-soluble vitamins (Vitamin A) are nonpolar, hydrophobic molecules and tend to be absorbed into fatty tissues and stored there. 2. Water-soluble vitamins (Vitamin C) are polar, hydrophilic molecules that circulate in the blood and intracellular fluids and are excreted from the body and must be replenished in the daily diet. Nightmare on White Street Chem Matters, December 1996

Head start on Vocab or work on Stem Project