Transcript Density Lab _4 - Moanalua Middle School

Density Lab #4
April 2 – April 9
Lab Report must be in the correct format
•Title and headings
•Sections should be in the correct format and
complete
Title: Density Lab #4
Research Question: How can the density help us
identify the material something is made of?
Background information:
Density: The amount of matter in a given
amount of space (characteristic property)
Mass: The amount of matter in an object
Volume: The amount of space in an object
Density = Mass
Volume
Equations/Formulas:
• Density = M or g = balance
V
ml
graduated cylinder
• Volume of a cylinder = pi(r2) x h
• Volume of a rectangular prism = l x w x h
• Volume of a triangular prism = ½ (l x w x h)
Hypothesis:
• If ………then….. (use what you know from
research question and background info)
• Object #1
• Object #2
• Object #3
• Object #4
• Object #5
Materials
•
•
•
•
•
•
•
•
5 objects
Centimeter Ruler
Water
Triple Beam Balance
Overflow Can
Graduated Cylinder
Napkins
Calculator
Procedure
Part 1
1.
2.
3.
4.
5.
6.
7.
8.
9.
Find the mass using the balance
Find volume using water displacement
Find volume using ruler measurements and
calculate the volume using the appropriate formula
Calculate density m/v using the water
displacement value
Calculate density m/v using the calculated volume
Record data in chart
Determine what type of material each sample is
made of, based on the known densities of
materials
Wash hands, clean up
Type group data on the computer for the class data
set
Proper BALANCE use
–Calibrate balance to zero
–Never place wet objects on balance
–Rest the swing when not in use
–Move larger weights first
–Make sure that the weights are set in the
groove
–One person moving weights at a time
–Let the balance stop swinging on its own
Data Observations
Object
Trial
1
2
1
2
1
2
1
2
1
2
1
2
Mass (g)
Volume
(H20)
displacement
Volume
(cm3)
Density
m/v
(H20) displacement
Density
m/v
(Calculated
Volume)
Data Analysis:
• Analyzing class data chart –
– Determine which pieces of data could
possibly be outliers
– Find the average density for all remaining
data, for each object
Compare your averages to the known densities to figure out what your
metal cube is possibly made out of
H2O 1.00g/ml
Magnesium 1.74g/ml
Berilium 1.84 g/ml
Aluminum 2.70g/ml
Titanium 4.5g/ml
Zinc 7.13g/ml
Tin 7.31g/ml
Iron 7.87g/ml
Copper 8.96g/ml
Silver 10.49g/ml
Lead 11.36g/ml
Mercury 13.55g/ml
Gold 19.32g/ml
Platinum 21.46g/ml
Brass 7.3 - 8.4 g/ml
Steel 7.7 - 8.1g/ml
Sterling Silver 10.2-10.3g/ml
Compare your averages to the known densities to figure out what your
metal cube is possibly made out of
H2O 1.00g/ml
Magnesium 1.74g/ml
Berilium 1.84 g/ml
Aluminum 2.70g/ml
Titanium 4.5g/ml
Zinc 7.13g/ml
Tin 7.31g/ml
Iron 7.87g/ml
Copper 8.96g/ml
Silver 10.49g/ml
Lead 11.36g/ml
Mercury 13.55g/ml
Gold 19.32g/ml
Platinum 21.46g/ml
Brass 7.3 - 8.4 g/ml
Steel 7.7 - 8.1g/ml
Sterling Silver 10.2-10.3g/ml
Conclusion:
-Restate Problem
-Define a Characteristic Property
-Answer the research question
-Explain a real world example of density
-Restate the hypothesis
-Validate or Refute the hypothesis
-Explain how the evidence validates or refulte the
hypothesis
-Explain how the evidence answers the problem
-Error Analysis
-Improve Lab