Essential Lab: Density

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Essential Lab Density
Capacity Development School Reform
Accountability School District of Palm Beach
County
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Density Lab

• Read lab
• Discuss and chart the following challenges with
  your team
• Teachers (content, discipline, motivation)
• Materials
• Students (supporting Levels 1 through 5)
• What can you do to make the lab successful?

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AGENDA

• Lab Norms
• Benchmark
• Bellringer
• Esstential Lab Using the 5 E Model

• Engage - Activity
• Explore - Lab
• Explain - Post Lab
• Elaborate - Applications
• Evaluate - Assessment

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LAB NORMS

• 1. Be responsible.
• 2. Follow ALL instructions carefully. 
• 3. Please do not touch any equipment, chemicals,
  or other materials in the laboratory area until
  you are instructed to do so.
• Do not eat food, drink beverages, or chew gum in
  the laboratory. 
• Dress properly during a laboratory activity
  safety goggles, lab coats, long hair tied back,
  no sandals, no dangling jewelry.

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BENCHMARKS

• SC.A.1.3.1 (AA) Student identifies various ways
  in which substances differ (e.g., mass, volume,
  shape, density, texture, and reaction to
  temperature and light)
• I can calculate the density of an irregularly
  shaped object using a triple beam balance, water
  displacement and the density equation
  mass/volume (Dm/v).

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• Cristian is trekking through a desert, he
  stumbles across a substance (A) that resembles
  gold. Later in the day he stumbles across another
  substance that looks similar to the first,
  substance (B). Since he wants to cash in on his
  discoveries, how can he ensure that what he has
  is gold?
• Golds density 19.32 g/cm3
• Substance A m120g v 6.21 cm3
• Substance B m120g v 5.1cm3

D 19.32 g/cm3
D 23.5 g/cm3
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• How can you calculate the density of an
  irregularly shaped object?

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VOCABULARY

• MATTER
• MASS
• VOLUME
• DENSITY
• TRIPLE BEAM BLANCE
• GRADUATED CYLINDER
• WATER DISPLACEMENT
• MENISCUS

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BACKGROUND INFORMATION

• All matter has mass. Mass is a physical property
  that is a measure of the amount of matter in an
  object.
• Matter also takes up space. The measure of the
  amount of space that matter occupies is a
  physical property called volume.

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BACKGROUND INFORMATION

• In science, milliliters (mL) and cubic
  centimeters (cm³) are often used to express
  volume. A milliliter is equal to a cubic
  centimeter (1 mL 1 cm³).
• Density is the mass of an object per unit of
  volume. Density equals mass divided by volume.
  Dm/V

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BACKGROUND INFORMATION

• You can measure mass using a triple beam balance.

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Measuring Mass
5th Add the amounts on each beam to find the
total mass to the nearest tenth of a gram.
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Measuring Mass
Once you have balanced the scale, you add up the
amounts on each beam to find the total mass.
What would be the mass of the object measured in
the picture? _______ ______ _______
________ g
Top Image http//www.southwestscales.com/Ohaus_Tr
iple_Beam_750-SO.jpgBottom Image
http//www.regentsprep.org/Regents/biology/units/l
aboratory/graphics/triplebeambalance.jpg
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BACKGROUND INFORMATION

• Graduated cylinders are used to measure the
  liquid volume when accuracy is important. The
  surface of a liquid in a container may be curved.
  

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MEASURING VOLUME
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MEASURING VOLUME
We will be using graduated cylinders to find the
volume of liquids and other objects.
Read the measurement based on the bottom of the
meniscus or curve. When using a real cylinder,
make sure you are eye-level with the level of the
water. What is the volume of water in the
cylinder? _____mL
Top Image http//www.tea.state.tx.us/student.asse
ssment/resources/online/2006/grade8/science/images
/20graphicaa.gifBottom Image http//morrisonlabs
.com/meniscus.htm
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MEASURING VOLUME
What is the volume of water in each cylinder?
Images created at http//www.standards.dfes.gov.uk
/primaryframework/downloads/SWF/measuring_cylinder
.swf
A
B
C
Pay attention to the scales for each cylinder.
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BACKGROUND INFORMATION

• The water displacement method is used to measure
  the volume of an irregularly shaped object.
• For example, to find the volume of a rock, simply
  fill a graduated cylinder with water to a
  specific level such as 50 mL.
• Adding the rock to the graduated cylinder causes
  the water level to rise to 65 mL. So, the rock
  displaces 15 mL of water. Since 1 mL 1 cm³,
  the volume of the rock is 15 cm³.

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Measuring Volume
We can measure the volume of regular object using
the formula length x width x height.
_____ X _____ X _____ _____
Click here for an online activity about volume.
Choose Lessons ? Volume Displacement
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• How can you calculate the density of an
  irregularly shaped object?

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Hypothesis
Write a hypothesis using an if then statement
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Density Lab

• Identify rock sample
• Measure the mass three times
• Measure the volume three times
• Calculate the density
• Average the densities
• Complete data tables
• Graph results
• Answer questions

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• DENSITY GIZMO

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Science Capacity Development Team
Cristian Carranza, Science Manager cristian.carran
za_at_palmbeach.k12.fl.us

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• Cristian is trekking through a desert, he
  stumbles across a substance (A) that resembles
  gold. Later in the day he stumbles across another
  substance that looks similar to the first,
  substance (B). Since he wants to cash in on his
  discoveries, how can he ensure that what he has
  is gold?
• Golds density 19.32 g/cm3
• Substance A m120g v 6.21 cm3
• Substance B m120g v 5.1cm3