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Activity 10 Follow-up
• Were there differences in your results from
one group to another?
• Why did we use the average to compare
to table 3 in activity 9?
Analysis:
1. Based on your density calculations and
the data on Student Sheet 10.1, what are
the two metallic solids from the unlabeled
mixture? Provide evidence from the
activity to support your answer.
• Aluminum and zinc
• This is because the density I calculated
for the light gray cylinder was __ and the
average from the group results was __
• Discuss the results for the dark gray
cylinder
3. Review your answer to Question 1 of
Activity 3, “A Plan to Separate the
Mixture.” How close was your prediction
about the number of substances in the
unlabeled mixture?
• Explain why you may have considered the
HDPE sample to be different substances
or why you counted the light and dark gray
cylinders as one substance
• Discuss your increase in confidence to
determine the amount of substances
based on the evidence gathered
4. Reflection: What are the three most
important things you learned in this unit
about identifying and studying materials
scientifically?
• Aware of safety precautions
Assume a substance is hazardous
Wear protective eyewear and gloves
Etc.
• Understand some methods used to identify
materials
 Corrosive, flammable, reactive, toxic
 Physical properties
Density of Water
Finding the Density of Water
• Do different amounts of water have the
same density?
• What two things do you need to know in
order to find the density of water?
• How can you measure a volume of water?
• How can you measure the mass of water?
Discussion
• Water molecules have the same mass and
size, are packed pretty close together, and
are spread evenly throughout.
• Since the water is the same throughout an
entire sample, the density is the same for
any amount of water.
• So, if a volume of water has a certain
mass, twice the volume will have twice the
mass, three times the volume has three
times the mass, etc. No matter what size
sample of water you measure, the
relationship between the mass and volume
will always be the same. Because D=m/v,
the density is the same for any amount of
water.
Density of Water
• The excepted value for the density of
water is 1 g/cm3
• Remember 1 cm3 = 1 mL
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