# Topic of the Week:  Mixtures, Solutions, and Suspensions Homework : read section pgs 96 – 99 4.3 Section Review SWBAT : list the four categories of matter.

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Topic of the Week:  Mixtures, Solutions, and Suspensions Homework : read section pgs 96 – 99 4.3 Section Review SWBAT : list the four categories of matter explain the difference between homogeneous and heterogeneous mixtures compare and contrast solutions to suspensions Class work/Labs: Mystery Mixtures Comparing Solutions to Suspensions

Quick Write! 1. What categories can matter be classified into? 2. Why is matter not classified into their different phases? SWBAT : list the four categories of matter explain the difference between homogeneous and heterogeneous mixtures Homework : read section pgs 96 – 99 4.3 Section Review

Quick Write! 1. Take a lab and read the steps. 2. Define heterogeneous and homogeneous mixtures on the lab packet. SWBAT : Identify the difference between homogeneous and heterogeneous mixtures Make observations and conclusions Homework : read section pgs 96 – 99 4.3 Section Review Complete the lab

 Four phases of Matter: 1. Solid 2. Liquid 3. Gas 4. Plasma  Four Phase Changes of Matter 1. Melting 2. Freezing 3. Condensing 4. vaporization What is new! Matter is classified according to makeup: Four classifications: 1. mixtures 2.Solutions 3.Elements 4.compounds

 Is the matter uniform throughout?  Can it be separated by physical means?  Can it be separated by chemical means?  By asking these questions scientists can classify matter into: 1. Mixtures 2. Elements 3. Compounds

 two or more substances that are not chemically combined with each other and can be separated by physical means.  The substances in a mixture retain their individual properties.  Example:  Solutions – a special kind of mixture where one substance dissolves in another.

Quick Write! 1. List 3 descriptions of heterogeneous mixtures. 2. Write down 3 examples of heterogeneous mixtures. SWBAT : explain the difference between homogeneous and heterogeneous mixtures Homework : due Thursday read section pgs 96 – 99 4.3 Section Review

 If the answer is no, the matter is a heterogeneous mixture.  What it means to be heterogeneous:  Considered the “least mixed.”  Does not appear to be the same throughout.  Particles are large and can be seen.  Particles can be separated from mixture.  Separates upon standing

 Sand and pebbles  Oil and water  Powdered iron and powdered sulfur

 If the answer is yes, the matter is homogeneous (appears to be the same throughout).  But can be a mixture, element or compound

 If the answer is yes, the matter is a homogeneous mixture or solution.

 A mixture that appears to be the same throughout.  It is “well mixed.”  The particles that make up the mixture are very small and not easily recognizable.  These particles do not settle when the mixture is set to stand.  Two Types of Homogeneous Mixtures: Solutions Colloids

Milk, toothpaste, and mayonnaise are homogeneous mixtures. They are also colloids.

Quick Write! 1. Notes SWBAT : explain what a colloid is what is the difference between solvents and solutes Homework : read workbook pgs 15-23 complete all pages due next Friday!

 In a colloid the particles are mixed together but not dissolved.  The particles are relatively large and are kept permanently suspended.

 A colloid will not separate upon standing.  The particles are constantly colliding, and this allows a colloid to scatter light – colloids seem cloudy.

NameExample Fog (liquid in gas) Clouds Smoke (solid in a gas) Smoke Foam (gas in a liquid) Whipped cream Emulsion (liquid in liquid) Mayonnaise Sol (solid in liquid) Paint Gel (liquid in a solid) butter Types of Colloids

 A solution is a type of homogeneous mixture formed when one substance dissolves in another.  best mixed of all mixtures  A solution always has a substance that is dissolved and a substance that does the dissolving.  The substance that is dissolved is the solute and the substance that does the dissolving is the solvent.

 Many liquid solutions contain water as the solvent.  Ocean water is basically a water solution that contains many salts.  Body fluids are also water solutions.

 The substance that does the dissolving The substance that is being dissolved

 Answer the following: 1. What is a colloid? 2. What is a pure substance? 3. Why are elements pure substances? 4. What is an atom? 5. Write the chemical symbols for: 1. Lead 2. Sulfur 3. Sodium 4. Helium 5. nitrogen

 Solubility  Elements  Compounds  Periodic table SWBAT : explain what is solubility what is the difference between solids and gases and their solubility periodic table Elements, compounds and atoms Homework : read workbook pgs 15-23 complete all pages by Friday! List 10 chemical elements that can be found in your house Quiz Wednesday

Quick Write! 1. What is solubility? 2. What is the relationship of temperature and solubility?  Is the relationship the same for gases and solids? SWBAT : explain what is solubility what is the difference between solids and gases and solubility Homework : read workbook pgs 15-23 complete all pages due Friday! find 10 chemical elements that can be found in your house by Friday Quiz Wednesday

GasGasGasLiquid SolidLiquid SoluteSolventExampleSolidSolid Metals dissolved in metals are called alloys.

GasGasGasLiquid SolidLiquid SoluteSolventExampleSolidSolid Metals dissolved in metals are called alloys.

GasGas Air (oxygen in nitrogen) GasLiquid Soda water (carbon dioxide in water) SolidLiquid Ocean water (salt in water) SoluteSolventExampleSolidSolid Gold jewelry (copper in gold) Metals dissolved in metals are called alloys.

 Soluble:  A substance that can dissolve in another substance  Insoluble:  A substance that does not dissolve in water  Solubility:  A given solute can be dissolved in a given amount of solvent at a certain temperature.  As temperature increases so does the solubility of a solid  As temperature increase solubility of gas decreases

Brass is an alloy of copper and zinc. Stainless steel is a mixture of iron and chromium.

 If the answer is no, the matter is a pure substance.  An element..\Periodic Table\The Element Song.avi..\Periodic Table\The Element Song.avi  Or a compound  Elements – simplest form of pure substance.  cannot be broken into anything else  Compounds – pure substances that are the unions of two or more elements.  can be broken by chemical means.

 Elements are the simplest pure substance.  They can not be changed into a simpler substance by any chemical process.  The smallest particle of an element is called an atom.  Atom: basic building block of matter.  There are more than 100 known elements in the universe  ttp://www.fossweb.com/CA/modules3- 6/MixturesandSolutions/activities/periodictabl e.html ttp://www.fossweb.com/CA/modules3- 6/MixturesandSolutions/activities/periodictabl e.html

 All elements are made of atoms.  Each atom has subatomic particles:  Proton  Neutron  Electron

 In 1813, a system of representing elements with symbols was introduced.  Each symbol consists of one or two letters.  Two letters are needed for a chemical symbol when the first letter of that element’s name has already been used.

AluminumBromine Calcium Carbon Gold Helium Hydrogen Nitrogen

AluminumAlBromineBr CalciumCa CarbonC GoldAu HeliumHe HydrogenH NitrogenN

 Are pure substances.  Are made from more than one element.  Example:  Water is a compound.  Water can be broken down into simpler substances: hydrogen and oxygen.

 Answer the following: 1. What is a colloid? 2. What is a pure substance? 3. Why are elements pure substances? 4. What is an atom? 5. Write the chemical symbols for: 1. Lead 2. Sulfur 3. Sodium 4. Helium 5. nitrogen

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