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Published byArline Grant Modified over 6 years ago

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**TOPIC: Lab Skills AIM: How do we determine density?**

DO NOW: Explain how layers exist in cappuccino. Layers exist in cappuccino because ________________________________________________________________________________

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Density The measure of the amount of mass that is in each unit of volume mass per unit volume

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**Instruments needed To measure density**

Triple beam balance for mass Graduated cylinder for volume of a liquid Metric ruler for volume of a solid

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Units used for density or Grams/ml or Grams/cm3

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**Box A has a greater density than Box B**

Because Box A has a greater mass (more matter/ molecules) in the same volume

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**Warm air rises b/c it is less dense than cold air which sinks.**

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Density of water 1 gm/mL

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Why will an object float or sink? FLOATS when the density of the object is LESS than the density of the liquid.

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**SINKS when the density of the object is GREATER than the density of the liquid.**

Less dense than water More dense than water

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Which is more dense? Salt water

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**Warm water rises b/c it is less dense than cold water which sinks.**

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**Each pure substance has it’s “own density” no matter what size it is.**

Facts Each pure substance has it’s “own density” no matter what size it is.

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**Cut the substance in half each half would still have the same density**

So……If I Cut the substance in half each half would still have the same density cut it in half

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**Cut the block in half M = 20 gm V = 10 mL M = 10 gm V = 5 mL**

Density = 20/10 = 2 gm/mL Cut the block in half M = 10 gm V = 5 mL Density = 10/5 = 2gm/mL

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wood plastic rubber copper

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**How is denisty calculated?**

AIM: Mass How is denisty calculated? Density = Volume M D V

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**M D V Denisty = Mass / Volume Mass = Density X Volume**

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Example #1: 1. What is the density of a metal block that has a mass of 525 gm and a volume of 50 cm3?

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D = m v D = 525 gm 50 cm3 D = 10.5 gm/cm3

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**What is the block made of?**

Silver = 10. 5 g/cm3

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Example #2 The mass of a marble is 8.8 gm. It has a volume of 2 mL. What is it’s density?

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D = m v D = 8.8 gm 2 mL D = 4.4 gm/mL

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Example #1 M = 45gm D = 20.1 gm/mL Volume = ? M D V

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V = M D V = 45 gm 20.1 gm/mL V = 2.2 mL

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**It’s density is greater than the density of water (1 gm/mL)**

Will this object float or sink in water? Why? Sink It’s density is greater than the density of water (1 gm/mL)

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Example #2 D = gm/mL V = 1.6 mL Mass = ? M D V

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M = D x V M = 3.5 gm/mL x 1.6mL M = 5.6 gm

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