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3.3 - Density. Density. Density is the amount of matter present in a given volume of a substance it is an intrinsic property of a substance – i.e., no matter how big or small an object is, all objects of the same substance have the same density

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Density
Density

  • Density is the amount of matter present in a given volume of a substance

    • it is an intrinsic property of a substance – i.e., no matter how big or small an object is, all objects of the same substance have the same density

    • Ex: a piece of copper the size of a house and a piece of copper the size of a marble both have the same density (8.96 g/mL to be exact)!

    • You can find densities of various substances in Table 2.8 on p. 44 of your text.


Density = mass/volume

Ex: a student finds that 23.50 mL of a certain liquid weighs 35.062 g. It’s density is:

Density = 35.062 g/23.50 mL

Density = 1.492 g/mL


Practice
Practice

What is the density of a medallion that has a mass of 55.64 g and a volume of 2.6 mL?

Density = mass/volume

Density = 55.64 g/ 2.6 mL = 21 g/mL


Practice1
Practice

What is the volume of an object that has a density of 25.4 g/mL and a mass of 3.26 g?

Density = mass/volume

Volume = mass/density

Volume = 3.26 g / 25.4 g/mL = 0.128 mL



The basics of matter
The Basics of Matter

  • Matter – is anything that has mass and takes up space – it is the “stuff” of which the universe is composed

  • The three states of matter:

    • Solid

    • Liquid

    • Gas



At a molecular level
At a molecular level…

  • Push the button to see


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