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DENSITY RULES. All pieces of the SAME material (no matter what the size) should have the density. When a piece breaks, the density of each piece is the same as the original. SAME. Constant relationship. density. Why? The atoms are still packed the same. size.

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DENSITY RULES


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    1. DENSITY RULES

    2. All pieces of the SAME material (no matter what the size) should have the density. When a piece breaks, the density of each piece is the same as the original. SAME Constant relationship density Why? The atoms are still packed the same size

    3. How to change the density of a material?

    4. The only way to change the density of a material is to change the way the atoms “pack”. The easiest way to do this is to change its temperature or pressure.

    5. a. Temperature

    6. a. Temperature • As an object is heated, it expands (volume increases) and the atoms become less packed. Therefore the object becomes less dense.

    7. When an object is cooled, it contracts (come together) and the atoms become more packed. Therefore, the object becomes more dense.

    8. Indirect Relationship Density Temperature As temperature increases, density __________ Decreases

    9. a. Pressure • Pressure – the force applied to a unit area of surface • Volume – decreases • Mass – remains the same • Density - increases

    10. D pressure Direct Relationship As pressure increases, density ____________ Increases

    11. 3. Density of Water 1g/cm3 • Density of water is: It is most dense at 4o C because the water expands above and below this temperature ESRT Page 1

    12. float 4. Less dense objects will on top of more dense objects. The dense objects will be on the bottom and the less dense on top.

    13. Graphing and Density • If volume is on the independent variable (X-axis) and mass is the dependent variable (Y-axis), then the slope of the line will indicate the ________ of the material being graphed. density

    14. Slope = density Mass (g) Volume (cm3) = mass volume Slope = rise run = Density

    15. Density of Water Mass (g) Volume (cm3) Slope = rise run = mass volume = Density 33 = = 1g/cm3

    16. More Dense Water Mass (g) Less Dense Volume (cm3) run volume