Solution Unit TEST Friday st March the 21 WOD and Video Quizzes Introduction Video • Take Notes • Quiz to Follow Activator – answer in your notebooks. • The solution to your lunchtime hunger may be a mixture. There are different kinds of mixtures – some are the same throughout, while • Which items in this picture others are mixed are the same throughout? unevenly. This Which are unevenly mixed? picture shows a few • Do you think the salad is the of both kinds of same kind of mixture as the mixtures. grape juice? Why or why not? SPS6: Students will investigate the properties of solutions. a. Describe solutions in terms of solute and solvent. EQ: How do different solutes with in solvents affect the behavior of a solution. Label each flap with the following: Solution Suspen- Solute sion Vs. Colloid Solvent A solution is a homogenous mixture in a single phase. • salt water, air steel, & tea Types of solutions…. • • • • • • Gas in gas Gas in liquid Liquid in liquid Liquid in solid Solid in liquid Solid in solid oxygen in nitrogen CO2 in water alcohol in cola mercury in silver sugar in Kool aid gold in nickel Look alikes…. • Suspension: a mixture that looks homogeneous but settles over time. • muddy water, blood & oil and vinegar Look Alikes…. • Colloids: mixtures with very small particles that permanently float. • Example: milk, shaving cream, jello, clouds, smoke Parts of a Solution… • Solute- substance that is dissolved • Solvent- substance that does the dissolving. Identify the solute and solvent Identify the solute and solvent GAS BUBBLES Universal Solvent = Water = aqueous Types of solutes • Electrolyte – solute • Non-electrolyte – solute that allows solution does not allow to conduct solution to conduct electricity electricity • NaCl in aqueous • Sugar in aqueous solution solution Factors Affecting Dissolving • Size of solute particles • Temperature of solvent • Agitation of solution • Solubility of solute Solubility – the amt of solute that can dissolve in a solvent (100 mL of water) Super-saturated Solution : Above the line To much solute, No more of the solute will be dissolved. X Saturated Solution: On the line Perfect ration of solute to solvent. X X Un-saturated Solution: Under the line Not enough solute, if more solute is added it can still be dissolved. Have out work sheet from yesterday. • Make sure the last 4 questions are complete. • Keep in mind: – Super = above the line – Saturated = on the line – Under = under the line Practice Problem 1. Which compound is the most soluble at 2. Which solute’s 40 degrees? solubility changes the least as temperature 3.increases? How many grams of potassium bromide will dissolve in 100 g of water at 70 degrees? Examine the solubility curve and decide if the following solutions would be saturated, unsaturated or supersaturated? 1. 200 g of NaClO3 at 20 degrees 2. 40 g of salt at 60 degrees 3. 55 g of potassium bromide at 100 degrees 4.At what temperature would a solution of 100 g of KNO3 in 100 g of water be considered unsaturated? Now Complete the Graphing Assignment. • Make the graph – LINE GRAPH, with a key (3 lines). • Extra graph paper provided if you mess up first graph – BUT, keep original for the data and questions portion. • Answer the question in complete sentences – extra paper provided if needed. • Staple all sheets together and turn in. Names for Compounds • 1. a) Salt = NaCl b) You pick answer c) You pick answer d) NH4Cl = Ammonium Chloride e) KNO3 = Potassium Nitrate f) KI = Potassium Iodide g) Match the compound with the symbol. Acids, Bases, and Salts Get out your GRAY STUDENT LEARNING MAP and complete this! The strength of an Acid or Base Depends on the degree in which a 1. acid 4. Base produce produce 2. Hydrogen Hydroxide atoms ions In solution which are 5. In solution which are 3. Positive and combine to form 6. Salt Negative SPS6: • D. Compare and contrast the components and properties of acids and bases. • E. Determine whether common household substances are acidic or basic. • EQ: How are acids and bases different; what are some common household examples? Activator • Many foods contain acids. For example, vinegar is a solution of acetic acid that has been used for centuries to preserve food. Some foods are more acidic, while others are less. Many acids have a sour taste. • LIST ANY 5 FOOD/DRINKS that you think are acidic. Acids – substances that + causes an increase in H ions in an aqueous solution Release Characteristics of Acids • liquids • sour taste • solutions conduct electricity • react with metals Examples of Acids HCl H3BO3 H2SO4 Acetic acid Citric acid - Hydrochloric acid Boric Acid Sulfuric Acid vinegar lemons, limes Bases (alkaline) – substances that cause a decrease in H+ ions in an aqueous solution Absorbing Characteristics of Bases • solids • bitter taste • solutions feel slippery • do not conduct electricity • do not react with metals Examples of Bases NaOH sodium hydroxide Ca(OH)2 - calcium hydroxide NH3OH ammonium hydroxide Soaps (lye), shampoos, “Drain-O” Physical Science Name __________________________ Date _________ Period ___ Battery Acid Sod a Black Coffee Baking Soda Drain Cleaner Pure Water Lemona de Tomato Juice Bleach Soapy Water Brain Pop on pH scale • http://www.brainpop.com/science/matteran dchemistry/phscale/ pH Scale - measures [H+] Phenolphthalein – chemical that Indicators - chemicals that change turns bright pink in butpH no color in solns of bases different change in acids Which pH indicator is the most specific? • pH paper Litmus Paper • When you think – Acid = Red – Bases = Blue – So, when using the litmus paper use the opposite color. – You want the paper to turn the color you associate the solution with. Unit 8: Solutions Test Format • 25 multiple choice • Test Review Sheet will be posted on Ms. Weis webpage on MCA site. • Check your answers. Lab TIME – copy this onto white paper! 1 2 3 4 5 A B C Vinegar NaOH Coke Lemon Juice Lysol Milk HCl Distilled Water Neutralization Reactions • Neutralization reaction - mixture of acid and base in correct proportions . • Forms a neutral solution of water and a salt • Example: HCl + NaOH -- NaCl + H2O • Titration: add acid/base drop by drop until end point is reached http://tinyurl.com/72topdc 6.7 pH Milk 2.5 pH Sports Drinks 6 pH Beauty Products Make a poster. Pick (5) pictures that represent the topics of this unit. Label the pictures with a WORD or PHRASE as to why you picked it.