7th Grade-Ch. 2 Sec. 1 States of Matter
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7th Grade-Ch. 2 Sec. 1 States of Matter

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    7th Grade-Ch. 2 Sec. 1 States of Matter 7th Grade-Ch. 2 Sec. 1 States of Matter Presentation Transcript

    • Ch. 2 Sec. 1 States of Matter  
    • This Japanese macaque soaks in a hot spring. In and around the spring, water exists as a liquid, solid, and gas.
    • solid
      •    definite shape & definite volume  
      • particles inside- packed tightly & stay
      • in fixed positions
      • - not motionless- vibrate
    • Hot, liquid lava flows from a volcano. When it cools to a solid, new rock will be formed.
    • types of solids
      • 1.    crystalline solid = solid made up of crystals
            • ex: salt, sugar, sand, snow
    • types of solids
      • 2.  amorphous solid = particles not arranged in regular pattern
            • no distinct melting point
            • ex: plastics, rubber, glass
    •  
    • liquid
      • no definite shape
      • takes shape of its container
      • definite volume      
    • A liquid takes the shape of its container but its volume does not change.
    • Particles in a liquid are packed close together but move freely, allowing liquids to flow.
      • substance that flows
      • liquids & gases
      YouTube video-Bill Nye Fluids song
    • surface tension
      • result of inward pull among molecules of a liquid that brings molecules on surface closer together
    • Due to surface tension, the surface of water can act like a sort of skin.
    • viscosity
      • resistance of a liquid to flowing
            • -high viscosity-flow slowly
            • -low viscosity-flow quickly
    • gas
      •      no definite shape
      •      no definite volume
      •      particles spread apart-
      • filling all available space
    • Time to Review
    • types of solids
      • 1.    crystalline solids
      • 2. amorphous solids
    • crystalline solid or amorphous solid amorphous solid glass
    • crystalline solid or amorphous solid crystalline solid
    • crystalline solid or amorphous solid crystalline solid
    • crystalline solid or amorphous solid amorphous solid
    • crystalline solid or amorphous solid crystalline solid sugar
    • solid
      •    definite shape & definite volume  
      • particles inside- packed tightly & stay
      • in fixed positions
      • - not motionless- vibrate
    • gas
      •      no definite shape
      •      no definite volume
      •      particles spread apart-
      • filling all available space
    • surface tension
      • result of inward pull among molecules of a liquid that brings molecules on surface closer together
    • liquid
      • no definite shape
      • takes shape of its container
      • definite volume      
      • substance that flows
      • liquids & gases
      YouTube video-Bill Nye Fluids song
      • Describe the properties of the shaving cream. Is it a solid, liquid, or a gas?  Why do you think so? 
      • Gently place a penny on top of it.  What happens? 
      • Rub some shaving cream between your thumb and index finger.  How does it feel? 
      • Let the shaving cream sit out overnight. 
      • Did you notice any change?   Examine the shaving cream blob with a magnifying glass.  What does it look like? 
      Solid, Liquid, or Gas?
      • Solid, Liquid, or Gas? Part 2
      • 1.Describe the properties of the cornstarch and water mixture.
      • 2.Does the cornstarch mixture have attributes like a solid or a liquid?
      • 3.How did the cornstarch mixture feel when you touched it?
      • 4.What happened to the cornstarch mixture when you tried to pour it?
      • 5. Name at least two unusual characteristics of the cornstarch mixture.
    • Viscosity Experiment Predict 6. PANCAKE SYRUP 5. KARO SYRUP Rate (# of seconds) 7. CONDITIONER 4. SHAMPOO 3. EX-LAX
      • VEGETABLE OIL
      • WATER
      High or low viscosity Fluid
      • Question: Which coin will hold the most drops of water?
      • Materials: 50 mL of water, a penny, a nickel, a dime and a medicine dropper.
      • Make a prediction : How many drops of water do you think you can fit on the top surface of each coin? ________________________________________________________________________________________________
      • Hypothesis: If _____________________________________, then __________________________________________.
      • Carefully add drops until the water spills off the penny.
      • Try this three times, recording the number of drops each time, and then find the average number of drops that can fit.
      • Results:
      • ____________________________________________________________________________________________________________________________________________________________________________________________________________________
      • Identify the variables involved in this experiment.
      • Independent variable ______________________________________
      • Dependent variable _______________________________________
      • Controlled variable _______________________________________
      Surface Tension experiment Name_______________________ 3. # of drops Dime Average 2. # of drops 1. # of drops Coin Nickel Penny
    • Draw, label & color a picture of the following:
      • Solid
      • Liquid
      • Gas
      • Amorphous solid
      • Crystalline solid
      • Fluid
      Pencil-solid