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Density Notes- Part 1 Chemistry 1

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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  1. Density Notes- Part 1Chemistry 1

  2. 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.

  3. 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

  4. 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

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

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

  7. 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.

  8. 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 = ______

  9. 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

  10. 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

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

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

  13. 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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