ADEC
Science Department Grade 7
Name:…………………………..
Zayed Althani School
2014 / 2015
Class: …………
Date :……./ …….. / ………..
Density
Write the definition of mass: _________________________________________________________
What units of measurement are used for mass?
__________________________________________
What tool/instrument is used to find the mass of an object?
_________________________________
Write the definition of volume: ______________________________________________________
What unit of measurement is used for a liquid? ________________
What unit of measurement is used for a solid? _____________
What is the formula to calcualte density: ______________________________________________
Let’s find the density of the following together…
Finding the density of a regular shaped object:
A rectangular solid of unknown density is 5 meters long, 2 meters
high and 4 meters wide. The mass of this solid is 300 grams.
Given this information for this homogeneous (alike throughout)
material, calculate its density.
5m
Density = ______________________________________
Finding the density of an irregular shaped object:
A rock occupies a volume of 20 cm3 and has a mass of 54 grams. Calcualte the
density of this rock.
Science For My Students | www.abubakrshalaby.com
2m
4m
ADEC
Science Department Grade 7
Name:…………………………..
Zayed Althani School
2014 / 2015
Class: …………
Date :……./ …….. / ………..
Density = ______________________________________
As a lab group, find the density of following regular shaped object…
You have a Jenga block.
Use the ruler to find the length, width and height. (Don’t forget to use cm)
length _________________ width __________________ height __________________
To determine the volume multiply length x width x height. (unit of measurement is
cm3)
Volume of the Jenga block = ________________________
Use the balance to find the mass of the Jenga block. (Don’t forget to use g)
Mass = _______________________
Let’s see how well you used the balance. Take the Jenga block to the back of the
room and place it on the electric balance. Record this mass. Use this mass when
you calculate density!
Mass = _______________________
Now calculate the density of the Jenga block.
Density = _________________________
Science For My Students | www.abubakrshalaby.com
ADEC
Science Department Grade 7
Name:…………………………..
Zayed Althani School
2014 / 2015
Class: …………
Date :……./ …….. / ………..
As a lab group, find the density of following irregular shaped object…
You have a large, metal screw.
Use the graduated cylinder.
Fill the graduated cylinder about halfway with water.
At eye level, record the volume of the water.
(Make sure you read the bottom of the meniscus)
Volume of water = ____________________________ ml
Now carefully slide the screw into the graduated cylinder. Be careful not to let any
of the water splash out. Read and record the new volume of water and screw.
Volume of water and screw = _______________________ ml
Subtract the volume of water and screw from just the volume of the water to get
the volume of the screw.
Volume of just the screw = ________________________ cm3
(1 ml = 1 cm3)
Dry off the screw.
Use the balance to find the mass of the screw. (Don’t forget to use g)
Mass = _______________________
Let’s see how well you used the balance. Take the screw to the back of the room
and place it on the electric balance. Record this mass. Use this mass when you
calculate density!
Mass = _______________________
Now calculate the density of the screw.
Density = _________________________
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