Density and Specific Gravity Quiz
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Questions and Answers

What property of a material does density measure?

  • The weight of the material
  • The color of the material
  • The amount of space it occupies
  • The amount of mass in a certain volume (correct)
  • Why does a brick sink in water while a liter of water floats?

  • Brick has a greater density than water (correct)
  • Brick is lighter than water
  • Brick has a lower density than water
  • Water is heavier than bricks
  • What is specific gravity a ratio of?

  • The mass of a mineral to the mass of an equal volume of rocks
  • The mass of a mineral to the mass of an equal volume of sand
  • The mass of a mineral to the mass of an equal volume of air
  • The mass of a mineral to the mass of an equal volume of water (correct)
  • How do different minerals' densities relate to their specific gravities?

    <p>Different minerals have different densities and thus different specific gravities</p> Signup and view all the answers

    What is the first step to determine the density of an unknown specimen?

    <p>Weigh it on a scale</p> Signup and view all the answers

    Why is it necessary to determine how much water an unknown sample displaces when measuring its density?

    <p>To calculate its specific gravity</p> Signup and view all the answers

    What characteristic makes a mineral suitable for use in measuring density?

    <p>Ability to displace water</p> Signup and view all the answers

    What is the volume of the sample in cubic centimeters (cc)?

    <p>20 cc</p> Signup and view all the answers

    How is density calculated?

    <p>Mass of the sample / Volume of water displaced</p> Signup and view all the answers

    What is the specific gravity of the sample?

    <p>7.5</p> Signup and view all the answers

    What is the specific gravity range for most common rock-forming minerals?

    <p>2-3</p> Signup and view all the answers

    Which mineral has a specific gravity of about 2.65?

    <p>Quartz</p> Signup and view all the answers

    What property determines the identity of the sample as galena?

    <p>Metallic luster</p> Signup and view all the answers

    What is the mass of an equal volume of water when 20 cc of water was displaced by the sample?

    <p>20 grams</p> Signup and view all the answers

    Study Notes

    Density and Specific Gravity

    • Density measures the mass per unit volume of a material
    • A brick sinks in water because its density is higher than that of water, whereas a liter of water floats because its density is equal to that of water

    Specific Gravity

    • Specific gravity is a ratio of the density of a substance to the density of water
    • Different minerals have varying densities, which are reflected in their specific gravities

    Measuring Density

    • The first step in determining the density of an unknown specimen is to measure its mass
    • It's necessary to determine how much water the sample displaces to calculate its volume
    • A mineral suitable for measuring density should displace a measurable amount of water when submerged

    Calculating Density and Specific Gravity

    • Density is calculated by dividing the mass of the sample by its volume
    • The volume of the sample is typically measured in cubic centimeters (cc)
    • Specific gravity is the ratio of the density of the sample to the density of water
    • The specific gravity range for most common rock-forming minerals is approximately 2.5-3.5
    • Galena has a specific gravity of about 2.65
    • The high density of galena is the property that determines its identity
    • The mass of an equal volume of water can be calculated by multiplying the volume of water displaced by the density of water (1 g/cc)

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    Description

    Test your understanding of density and specific gravity with this quiz! Explore questions related to the amount of mass in a certain volume of material and learn how to differentiate between the weights of different materials based on their densities.

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