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Lab Exercise (Density 1) – Answers
Objectives

a)

To determine the density of pebbles
...
[Formative]

Part A: To determine the density of pebbles (Density of sinking object)
Materials
Electronic balance, pebbles, measuring cylinder
Procedure
1

Record m, the mass of a sample of pebbles using the electronic balance
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Record this volume as V1
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Record the new volume
as V2
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5

Calculate the density of pebbles in g cm-3
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f
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p
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p
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p
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f
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f
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Pebbles should be lowered gently into the measuring cylinder to prevent water from
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splashing out of the measuring cylinder and affecting the accuracy of the results
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Apparatus
Measuring cylinder, thread, piece of stone, a piece of wooden cork, electronic mass balance
Procedure
1
Use the electronic balance to measure the mass of the wooden cork, m
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0 cm3 of water
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Record the volume of water now
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as V1
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5
Place the stone and the wooden cork into the measuring cylinder
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6
Calculate the volume of the wooden cork by using the formula: V = V1 – V2
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7
Calculate the density of the wooden cork by using the formula: Density = m / V
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Readings
Mass of wooden cork, m = __________ (2 d
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)
Volume of water and stone, V1 = __________ (1 d
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)
Volume of water, stone and cork, V2 = __________ (1 d
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)

2

Calculations
Volume of cork = V1 – V2
Volume of cork = V (1 d
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and most likely 2 s
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)
Density of cork = m / V
Density of cork=  (2 s
...
)

Conclusion
The density of the cork is 
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Describe how you would find the density of cooking oil
using the apparatus given in a laboratory
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3



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