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Science powerpoint Science powerpoint Presentation Transcript

  • Ch. 2 Powerpoint By Lauren
  • Matter *Matter is everything that takes up space and has mass. Everything you touch, taste, smell, see, and even things you can’t, is matter. It can be made of one type of atom or many types of atoms Mixture *Matter with properties Pure Substances that can vary and not fixed composition. Two*Matter with fixed, uniform composition. or more substances that you physically mix Element together. *A substance thatcannot be destroyed into smaller parts. Compound Heterogeneous Homogeneous Only one type of atom *A substance made Mixtures Mixtures from two or more *The parts in the *The parts in the mixture elements in fixed mixture are very are very different. proportions. hard to tell apart.
  • Solutions: Colloids: Suspensions: *A colloid contains *A suspension is a*A solution is a particles that are heterogeneous homogeneous in-between mixture, it mixture when in size. They do separates over time. A 2 or more not seperate into great example is oil andsubstances are layers. Fog is a vineger or sand and water. dissolved colloid. A property together. of a colloid is a scattering of light.
  • 7 examples of physical properties *A physical property is used to recognize a material, to select a material for a purpose, or to take apart substences in a mixture. Conductivity: *A material’s capacity to permit heat to flow through it. Some Viscosity: materials are good Malleability: *A property that conductors of heat like *It is when a solid isdetermines a liquid’s metal, others are not, able to bethickness, stickiness, like wood. hammered or bent and how it flows. without When something is breaking. Most metalsreally thick is has a are malleable. high viscosity.
  • Hardness: *The comparative resiliance of an object scratching another object. “Hard as a rock.” Melting & Boiling Points: *The temperature when a substance changes from a solid to a liquid is called it’s melting point. The temperature when a liquid substance boils and turns into a gas is it’s boiling point. Density:*Density is a ratio of a substancesmass to its volume. It can tell you if a substance is pure or contains other substances.
  • Using Physical A physical property is used to recognize a material, to select a material for a purpose, Properties: or to take apart substances in a mixture. Step 1.Using Properties Decide the propeties to test. to Identify Step 2. Test a sample of the unknown. Materials: Step 3. Compare results. Using *A property is chosen for the Properties to material to be used. Choose Materials: * This is when an object changes physically however the substancesPhysical Changes: stay the same. An example would be ice cream melting.
  • Using Properties to Separate Mixtures: *The two common separation methods are, filtration and distillation. Filtration: Distillation: *It separates the materials by their *It separates the materials boiling points. This is used to separate based on the size of the particles. If you particles that are small enough to passuse a filter, some particles can be captured through a filter. An example would be and some strain through. You would use you would use distillation when trying to filtration when you were panning for gold. separate fresh water and seawater.
  • Filtration: An example of when you use filtration when separating sand from water. Pour the sand and water into a test tube andmix them together. Place a funnel inside the top of a beaker, then fold a piece of folded filter paper and put it in the funnel. Pour the test tube full of the sand and water, into the funnel and watch the water flow through the filter paper and the sand collect in the paper. After you haveremoved the sand from the filter paper take the filter out of the beaker and set it out to dry.
  • Distillation: An example of when you use distillation when trying toseparate fresh water from seawater. Heat the seawater untilit changes into a gas. Cool the gas until it changes back into a liquid, that is collected into a container. This is able tohappen because the compounds that are dissolved in the sea water have a higher boiling point than in fresh water.
  • Evaporation:An example of when you use evaporation would be separating water from sodium chloride. Put the sodium chloride and water into a test tube and mix them together. After put itinto an evaporation dish and set the dish onto top of the wire stand. Under the wire stand put an alcohol burner and lightit on fire. On the top of the evaporation dish there should be steam on the top of the water and the water should have small bubbles. After all the water has evaporated from the dish take the sodium chloride out.
  • Chemical Properties: Flammability: A substance is able to burn with the presence of oxygen. Reactivity:How readily substance chemically combines with another substance.
  • Recognizing Chemical Changes:There are three different types of chemical change: a change in color, a production in a gas, and the formation of a precipitate.
  • A change in color: Production of a gas:An example is: copper because it An example is: vinegar and bakingwas shiny but then later it turns soda. green. Formation of a precipitate: An example is: the curdling of milk.
  • Is a rock a mixture? Is candy a pure substance?Which is a homogeneous mixure; sand, trail mix, lemonade? How would you classify the following;water, salt, gold, oxygen, milk, wood, soup, glass
  • What is one way to tell the difference between a solution, suspension or colloid? Answer - By it’s ----------
  • What physical property term would you use to describe: syrup copper quick sand water
  • If you were trying to find a needle is a hay stack, what separation method would you use? What is a property? What is paint an example of? What is matter? What is an example of a physical change of a colloid liquid to a solid?
  • Is pure sugar a pure substance?Approximately how many elements are there in the world?
  • THE END