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Density Notes- Part 1 Chemistry 1. Density. The compactness and size of the molecules or particles of a substance the more compact or squished together the molecules are and the more mass the particles have, the larger the density The relationship between an object’s MASS and VOLUME

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Density Notes- Part 1 Chemistry 1

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Density Notes- Part 1Chemistry 1


Density

  • The compactness and size of the molecules or particles of a substance

    • the more compact or squished together the molecules are and the more mass the particles have, the larger the density

  • The relationship between an object’s MASS and VOLUME

  • Density is a characteristic property of substances and can be used to help identify substances.


  • MASS is the amount of matter an object contains

    • Mass does not change unless you add or remove matter

  • VOLUME is the amount of space an object occupies

  • Density = Mass

    Volume


Finding Mass and Volume

  • Mass is always determined using a balance.

    • Triple beam or electronic

  • Remember you always must take into account the mass of the container one of two ways:

    • Tare the balance (zero out the container’s mass)

    • Or measuring the mass of the container and then subtracting it out later from the total mass of the container + substance


  • Volume can be found in different ways, depending on the substance or object.


  • Liquid volumes are read in volumetric lab equipment, like a graduated cylinder or pipet.


  • The dimensions of regularly shaped objects may be measured and then the volume found by using a formula such as V=l x w x h.


  • The volume of irregularly shaped objects may be found by water displacement

    • measure a given amount of water in a graduated cylinder

    • add the object and read the volume of the water + object

    • then find the volume of the object by subtraction.

Amount of H2O with object = ______About of H2O without object = ______Difference = Volume = ______


Units

  • Mass units are usually grams (g)

  • Volume units are usually

    • Milliliters (mL) or cubic centimeters (cm3)for liquids or solids

      • 1mL = 1cm3

    • L for gases

  • Density units will always be a

    Mass unit like g/mL or g/cm3 or g/L

    volume unit


Using the density formula

  • D=m/v can be used to solve for density if the mass and volume is known

  • What if the density is known, and you need to find the mass or volume?

    • Just rearrange the formula to solve for the unknown

      m=Dv or v=m/D


examples

A 10.0mL sample of a sugar solution has a mass of 5.0g. What is the density of the sugar solution?


  • A piece of metal has a mass of 114g and a volume of 10.0cm3. What is the density of the metal?


  • A substance’s density is known to be 5.6g/mL. You have a 25.0mL sample of the substance. What is the mass of the sample?


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