Catalyst – November [prime # between 8 & 13] Resume, P/C Change HW Out Please 1. Which of the following is evidence of a CHEMICAL change? crumpling aluminum foil, lathering shampoo on yo head, or passing gas 2. How is our tap water made ready for us to drink? What substances are taken out of it or added to it before we drink it?

Today’s Agenda  Catalyst  Review Phys/Chem Change Lab and HW  Separating Mixtures Notes and Lab  Exit Question HW TONIGHT: SEPARATION SLIP, STUDY FOR QUIZ!

Today’s Objectives  SWBAT separate mixtures using differences in physical properties. QUIZ 6.1 TOMORROW! LCM PHYSICAL AND CHEMICAL CHANGE MIXTURES AND SEPARATION

Review Physical or Chemical Change?  A physical change is a change, but only physical properties change  A chemical change is also a change, but it forms a new substance

Evidence of Physical Change Bending, breaking, smashing, freezing, melting, evaporating, crushing, cutting, tearing, sanding, grinding, mixing, separating, dissolving...

Evidence of Chemical Change Fizzing, burning or combustion, corrosion, production of odor, heat, cold, light, rust, solids, smoke, decomposition, oxidation, rotting, digestion…

PHYSICAL AND CHEMICAL CHANGE LAB AND HOMEWORK REVIEW

Mixtures….of whaaaaat?!?!? Key Point #1: Mixtures are PHYSICALLY combined, so they can be PHYSICALLY separated. A mixture is a combination of two or more substances in which each substance keeps its individual chemical properties.

Let’s look at some mixtures…

Why is separation of mixtures so important in chemistry?  When you perform reactions, you must often isolate certain products…

Real-Life Examples of Separating Mixtures  Separating components of blood  Separating oil from water in an oil spill  Getting drinkable water in third world countries

How you do that?  Key Point #2: Chemists separate mixtures by using differences in physical properties of each part.  Physical Properties:  Size  Density  Solubility  Magnetism  Boiling Point

Think about DIFFERENCE in Properties!  Size:  Ex: a polar bear and a butterfly  Density: Will it float or sink in water? OR Which is more dense?  Ex: toothpicks and coins; Ex: water and oil  Solubility: Will it dissolve in water?  Ex: rocks and sugar  Magnetism: Is it magnetic?  Ex: paper and metal clippings  Boiling Point: At what temperature does it boil?  Ex: water (100ºC) and alcohol (82.5 ºC)

Separation Group Challenge!  Problem: You have a mixture of sand, salt, wood chips, and iron fillings. It is your job to successfully separate all of these components. Write a plan for how you would do this!  Possible Materials to use:  Magnets  Distilled water  Funnel  Filter paper  Hot plate  Watch glass  Spoon  Beaker

LAB/NOTES TIME

Density and Magnetism Key Point: You can separate mixtures based on differences in density and magnetism.

Density  Based off differences in density, you can separate liquids from each other Ex: Oil and Water

Magnetism  Based on differences is magnetism, you can separate magnetic objects from non- magnetic objects Ex: Rocks and Coins

SEPARATION TECHNIQUES Key Point: Filtration separates a solid from a liquid by filtering out the liquid.  What physical property is being utilized here?  Utilizes solubility, density, phase of substances

Filtration  Based on differences in solubility, density, and phase, you can separate solids from liquids using filtration Ex: Sand and water Ex: Spaghetti and water

Filtration

SEPARATION TECHNIQUES Key Point: Crystallization separates a solid that has been dissolved in a liquid by boiling off the liquid.  What physical property is being utilized here?  Utilizes different boiling points of each substance

Crystallization  Based on differences in boiling points, you can separate dissolved solids from liquids  Ex: Boil salt water to crystallize salt and evaporate water

SEPARATION TECHNIQUES Key Point: Distillation separates two liquids from each other by boiling off one liquid at a time.  What physical property is being utilized here?  Utilizes the differing boiling points of each substance

Distillation  Based on differences in boiling points, you can separate two liquids from each other.  Liquid A has a boiling point of 100°C  Liquid B has a boiling point of 110°C  How could I separate these two mixtures?

Independent Practice Identify the technique (magnetism, density, filtration, distillation, or crystallization) you would use to separate the following mixtures: (1) Remove rocks from an ocean water sample. (2) A solution of salt water. (3) A mixture of oil and water. (4) Isolate sugar from a sugar-water solution. (5) Salt and ammonium chloride mixture (salt is not soluble in ammonium chloride). (6) A mixture of paperclips and rice. (7) A mixture of water and oil.

Reaction Challenge – HOMEWORK BaCl 2 (aq) + Na 2 SO 4 (aq)  BaSO 4 (s) + NaCl(aq) 1. Balance the reaction. 2. If 45.0 grams of BaCl 2 reacts with 77.4 grams of sodium sulfate, what should the mass of the products be? (Hint: LCM) 3. Write a plan for separating this mixture. THINK! What order should you go in when separating???

Exit Question 1. List 4 separation techniques you could use in chemistry. HW TONIGHT: SEPARATION SLIP, STUDY FOR QUIZ!

Exit Question 1. Label the following as physical change (P) or chemical change (C). A) wood rotting B) peeling a banana C) painting your face blue and gold for the baseball game