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What is the density of water?
Does 1 mL of water really equal 1 cm3 ?
Submitted by: Deonna L.
Recommended Grade Level(s):
Appropriate for: Chemistry, Biology, Physics and introductory science
Time Requirements:
Prep Time: 10 minutes
Activity Time: 30 minutes
Teaching Topics & Concepts:
This activity discusses density. It also discusses how units relate to one another.
National Science Standards Alignment
5-PS1-3: Make observation and measurements to identify materials based on their properties
Materials:
• Water
• Pipettes
• 50 mL Beakers
• 10 mL Graduated cylinders
• 0.01 g Analytical balances
• Metric ruler
• 1 cm Graph paper
Background Information, Activity Setup:
In this lab, students will determine the density of water. Students will also make the connection that 1 mL of water is 1 cm3.
Students will practice taking accurate and precise measurements.
Expected Results:
Results will depend heavily on how well students can read laboratory instruments and create their 1 x 1 x 1 cm box. This lab is also a
lesson in significant figures. Students should find that 1 mL and 1 cm3 are indeed the same amount of water. Students should also
determine that the density of water is 1.0 g/cm3 or 1.0 g/mL.
Teaching Notes:
Depending on the abilities of your students, you may want to create your 1 x 1 x 1 cm boxes for your students. If they are not as square as
possible, it will hinder the results. To make the boxes print 1 cm graph paper. Cut out a "plus sign" and put tape all over the "plus sign" to
laminate it. This will prevent water from damaging the paper. Lastly fold the "plus sign" to make a cube and tape together.
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