Transcript Density Water Displacement/ Practice

Density Water Displacement/
Practice
 Objective:
 Today I will be able to:
 Analyze the relationship between mass and volume of matter
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Self-assess my performance on the data analysis and conclusion from lab
Visualize the molecular structures of substances with different densities
Apply the water displacement method to calculating density
Correctly solve density problems
 Informal Assessment – monitoring student questions and group interactions
during the lab
 Formal assessment – analyzing responses to the exit ticket, lab and practice
problems
 Common Core Connection
 Make sense of problems and persevere in solving them
 Attend to precision
 Use appropriate tools strategically
Lesson Sequence
 Evaluate: Warm-Up
 Explain: Methods for Calculating Density Notes
 Engage/ Explore: Water Displacement lab
 Elaborate: Density Practice Problems
 Evaluate: Exit Ticket
Warm - Up
 How did you use math to analyze the relationship between
mass and volume in lab yesterday?
 What did you notice about the densities of the three different
volumes of water?
 Take out your lab from yesterday
 Check off the lab self-assessment sheet to see how you did on
the lab
Objective
 Today I will be able to:
 Apply the water displacement method to calculating density
 Correctly solve density problems
Homework
 Study for a Metric System/Dimensional Analysis/Accuracy
and Precision Quiz Friday
 Finish Density Practice Problems
Check Aspen!!
See all the
grading I’ve been
helping with!
Agenda
 Warm-Up
 Lab Self-Assessment
 Revisit the exit ticket from yesterday
 Density and states of matter notes
 Methods for Calculating Density Notes
 Water Displacement activity
 Density Practice Problems
 Exit Ticket
Lab Self-Assessment
Review your lab from yesterday. Check off only the
bullets that you were successful in achieving
Lets do a quick warmup!
Q: Think about the densities of the
following substances. Use the density to
answer the following questions.
A. Lead
B. Feathers
Which has a greater mass, 6.00 g of lead
or 7.00 g of feathers?
A. Lead
B. Feathers
Which occupies a greater volume, 5.00
cm3 of lead or 5.00 cm3 of feathers?
A. Lead
B. Feathers
Which occupies a greater volume, 5.00 g
of lead or 5.00 g of feathers?
A. Lead
B. Feathers
Which occupies a greater volume, 9.00 g
of lead or 50.0 g of feathers?
A. Lead
B. Feathers
Which occupies a greater volume, 50.0 g
of lead or 9.00 g of feathers?
A. Lead
B. Feathers
What is density… more specifically
 Physical Property
 Density reveals how tightly the molecules composing the
matter are packed and how heavy the molecules are
 Compared to the liquid they are in, less dense materials float,
more dense sink
 Substances are often IDed by their density, as it is rare for
two substances to have the same density
Density and States of Matter
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Solids – composed
of tightly packed
molecules, low
kinetic energy, high
density (Iron)
Density and States of Matter
 Liquids – more
loosely packed than
solids, density less
than solids (water)
Density and States of Matter
 Gases – molecules
are all over the place,
density less than
solids and liquids
(air)
How are the molecules arranged
differently in the lead block and
feathers?
Methods for Calculating Density
Calculating Density
 Remember, Density = mass/volume
 Mass is determined using a scale
 Volume is calculated several different
ways
Finding Volume
 To find the volume of a
liquid, use a graduated
cylinder
 Make sure to read the bottom
of the meniscus
Finding Volume
 Length x Width x
Height
 Volume of a regular
object, such as a
wooden block
Finding Volume
Water Displacement Method
- Read the initial volume of water in a
graduated cylinder
- Place object into cylinder
- Read the final volume of water
- Final – Initial = Volume of the object
Density Water Activity
We will use the same groups as yesterday!
Lab Safety/ Clean Up
 No closed toe shoes or aprons are required
 If you spill, clean the water with a paper towel
 When you finish collecting data, return the lab area as you
found it
Density Practice
When you finish the lab activity begin working on
the Density practice problems. Whatever problems
you do not finish will become your homework.
Exit Ticket
 Which of the following would be more dense. An 18 gram
sample of water or an 18 gram sample of carbon dioxide.
Explain your answer.