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Ch 11 8th grade Lessons 1&2
 

Ch 11 8th grade Lessons 1&2

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    Ch 11 8th grade Lessons 1&2 Ch 11 8th grade Lessons 1&2 Presentation Transcript

    • CHAPTER 11-LESSONS 1 & 2 Miss Reaves 8 th Grade Science
    • WHAT YOU WILL DO TODAY:
      • First time -Just listen and watch this presentation . Don’t take notes!!
      • Watch the presentation a second time. THIS time, fill in the blanks in your notes.
      • DO NOT freak out if you miss something!!!! This is posted on the 8 th grade page of KMSstudent.com.
      • Complete Vocabulary Squares in class and for homework.
    • Matter: Pure and Mixed substances http://iespebilingue.wikispaces.com
    • http://iespebilingue.wikispaces.com Classification SUBSTANCES MIXED SUBSTANCES OR MIXTURES PURE SUBSTANCES HETEROGENEOUS HOMOGENEOUS LIQUID SOLUTIONS GAS SOLUTIONS SOLID SOLUTIONS COMPOUNDS ELEMENTS
    • http://iespebilingue.wikispaces.com SUBSTANCES PURE SUBSTANCES: they have well defined specific properties: density, fusion, boiling temperatures… MIXTURES: they are made up of two or more different substances. They do NOT have well defined Specific properties.
    • Concrete, conglomerate rock, as well as oil and vinegar are all heterogeneous mixtures. The particles are large enough to be seen and can be separated from the mixture. Homogeneous mixtures are very well mixed. A salt solution is a homogeneous mixture.  http://iespebilingue.wikispaces.com MIXTURES HETEROGENEOUS: we can clearly distinguish the different components. Some examples include salads, soups, and cookies.   HOMOGENEOUS: we cannot see the different substances that make up a mixture.   Some of examples include alcohol and water.
    • Have you ever put sugar in a glass of milk? After you stir, you can no longer see the sugar. The sugar is still there, as you can taste it. A mixture of sugar and milk is called as solution . By evaporation we can separate the different kinds of matter in solution. http://iespebilingue.wikispaces.com HOMOGENEOUS MIXTURES LIQUID SOLUTIONS: we usually speak of solutions for liquid mixtures. GAS SOLUTIONS: like the air. SOLID SOLUTIONS: like steel which is a mixture of iron and carbon.
    • http://iespebilingue.wikispaces.com PURE SUBSTANCES COMPOUNDS: They can be broken down into simpler substances using chemical methods. ELEMENTS: They can’t be broken down.
    • The Periodic Table of Elements http://iespebilingue.wikispaces.com
    • http://iespebilingue.wikispaces.com Separating components SEPARATION TECHNIQUES DECANTATION FILTRATION MAGNETISM SIEVING DISTILLATION CRYSTALIZATION
    • Decantation  is a process for the separation of mixtures. This is achieved by carefully pouring a solution from a container in order to leave the sediments in the bottom of the original container. Decantation http://iespebilingue.wikispaces.com
    • Filtration Filtration  is commonly the mechanical or physical operation which is used for the separation of solids from fluids (liquids or gases) by interposing a medium through which only the fluid can pass.  http://iespebilingue.wikispaces.com
    • Magnetism Magnetism is a process in which magnetically susceptible material is extracted from a mixture using a magnetic force. http://iespebilingue.wikispaces.com
    • Sieving A  sieve separates wanted elements from unwanted material. http://iespebilingue.wikispaces.com
    • Crystalization : this technique is used for obtaining a compound in pure solid form of well-defined geometrically shaped crystals.  http://iespebilingue.wikispaces.com Crystallization
    • Distillation  is a method of separating mixtures. It is a   process in which a liquid or vapour mixture of two or more substances is separated into its component fractions, by the application and removal of heat. http://iespebilingue.wikispaces.com Distillation/Evaporation
      • http://explore.ecb.org/videos/VLC_media?P1=VLC077&REFERER=OTHER
      • http://www.differencebetween.net/science/difference-between-heterogeneous-and-homogeneous/
      • http://www.rpdp.net/sciencetips_v3/P8A3.htm
      • http://chemsite.lsrhs.net/Intro/Pure_vs_mixtures.html
      • http://www.wineloverspage.com/vino101/decant07.phtml
      • http://chemistry.tutorvista.com/inorganic-chemistry/properties-of-solutions-and-types-of-mixtures.html
      • http://fphoto.photoshelter.com/image/I0000nrYPvzifous
      • http://chemsite.lsrhs.net/Intro/Pure_vs_mixtures.html
      • http://64.224.111.143/handbook/periodic/
      http://iespebilingue.wikispaces.com References
    • SOLUTIONS, SUSPENSIONS, AND COLLOIDS
    • GOAL:
      • To classify mixtures as solutions, suspensions, or colloids.
    • IT’S ALL ABOUT THE PARTICLES!
      • The size of the particles has a great effect on the properties of a mixture.
      • You must observe a mixture’s properties before deciding whether it is heterogeneous or homogeneous.
      • Mixtures get classified as solutions, suspensions, or colloids based on particle size.
    • SOLUTIONS
      • Q: When iced-tea mix is dissolved in water, it forms what kind of mixture?
      • A: HOMOGENEOUS MIXTURE
      • When substances dissolve and form a homogeneous mixture, the mixture is called a solution. Whatever substance there is more of is called the solvent. The other is called the solute (ex. Iced tea-the solvent is the water, the solute is the tea mix).
    • SOLVENT VS. SOLUTE
    • PROPERTIES OF A SOLUTION
      • They do not separate into layers over time.
      • If they are poured through a filter, none of the substances will get trapped.
      • Light passes through them.
      • All of the particles in a solution are too small to become separated, filter out, or scatter light.
    • SUSPENSIONS
      • Flour in water, like other liquids that need to be “shaken well before using”, are called suspensions.
      • Muddy water taken from a swamp is another example.
    • PROPERTIES OF A SUSPENSION
      • Heterogeneous mixture
      • Separates into layers over time.
      • Filters can separate particles that make up a suspension.
      • Particles are larger than those in a solution.
      • Scatter light.
      • Suspended particles settle out of a suspension.
    • COLLOIDS
      • Colloids contain some particles that are intermediate (in the middle) between those in a solution and those in a suspension. Examples include peanut butter, pudding, Jello, whipped cream, and even fog!
    • PROPERTIES OF COLLOIDS
      • Do not separate into layers.
      • Particles will not become trapped by a filter.
      • Scatter light.
      • Colloids and suspensions appear cloudy; unlike solutions which are much clearer.
      • Colloids and solutions will not separate into layers; suspensions will.
    • Examples of Colloids   Dispersing Medium Gas Liquid Solid Gas   shaving cream, whipped cream foam rubber, sponge, pumice Liquid fogs, clouds, aerosol can spray mayonnaise, milk, face cream, hair gel jelly, cheese, butter Solid smoke, car exhaust, airborne viruses Gold in water, milk of magnesia, river silt alloys of metals (steel, brass)
    • VOCABULARY WORDS (FOR VOCAB SQUARES)
      • Solution
      • Suspension
      • Colloid
      • Solute
      • Solvent
      • Filtration
      Define Sketch (COLOR!) Example Non-example/Opposite
    • THE END
      • For the rest of class and for homework, complete the vocabulary squares.
      • Use your text book if you need to. Ch. 11 pg. 388
      • Don’t forget to bring your new IAN tomorrow!!!
      • Thank you!!!!!!! 