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Unit 3: Particle Model of Matter
3.1 Density
3.1.2 Measuring Density
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Cards (38)
The formula for density is Density = Mass /
Volume
True
What are the common units for density?
kg/m³ and g/cm³
Denser materials have a higher
mass per unit volume
compared to less dense materials
True
What is density a measure of?
Mass in a given volume
Density is calculated using the formula: Density =
Mass
/ Volume
Match the material with its density in kg/m³:
Water ↔️ 1000
Aluminum ↔️ 2700
Steel ↔️ 7850
Gold ↔️ 19300
What tool is used to measure mass?
Balance or scale
Mass is a fundamental property of an object and is conserved
True
Density is measured in kilograms per cubic meter or grams per
cubic centimeter
.
True
Mass is conserved, meaning it cannot be created or
destroyed
.
Steps to measure the volume of a regular-shaped object
1️⃣ Measure the dimensions
2️⃣ Apply the correct formula
3️⃣ Calculate the volume
When measuring the volume of a rock, the
initial
volume of water is subtracted from the final volume with the rock.
True
An object with a mass of 50 grams and a volume of 20 cm³ has a density of 2.5 g/cm³.
True
Match the material with its density:
Water ↔️ 1000 kg/m³
Aluminum ↔️ 2700 kg/m³
Gold ↔️ 19300 kg/m³
What does it mean for mass to be conserved?
It cannot be created or destroyed
Mass is a measure of the amount of matter in an object and remains
constant
regardless of location.
True
What formula is used to calculate the volume of a cube?
V
=
V =
V
=
s
3
s^{3}
s
3
Steps to measure the volume of an irregular shape
1️⃣ Add known volume of liquid to a measuring cylinder
2️⃣ Place the object in the cylinder
3️⃣ Measure the new volume
4️⃣ Subtract the initial volume from the new volume
What is the density of an object with a mass of 50 g and a volume of 20 cm³?
2.5 g/cm³
To convert 1 kg/m³ to g/cm³, multiply by
0.001
What method is used to measure the density of a regular-shaped cube?
Measure side length with ruler
Systematic errors are consistent errors caused by instrument calibration issues or experiment
flaws
How can the impact of random errors be reduced?
Averaging multiple readings
The balance displays the mass in grams or
kilograms
What does density measure?
Mass per unit volume
Steps to measure the mass of an object
1️⃣ Place the object on a balance
2️⃣ Read the mass value
3️⃣ Note the units of measurement
4️⃣ Understand that mass is conserved
Volume
is the amount of space an object occupies.
True
For irregular shapes, the volume can be measured using a measuring
cylinder
.
What does volume measure?
Space an object occupies
Denser materials like gold have a higher mass per unit volume compared to less dense materials like
water
.
True
To measure the mass of an object, place it on one side of a balance or
scale
What is the mass of the apple in the example table?
150 grams
What is the formula to calculate the volume of a cylinder?
V
=
V =
V
=
π
r
2
h
\pi r^{2} h
π
r
2
h
The density formula is
D
e
n
s
i
t
y
=
Density =
De
n
s
i
t
y
=
M
a
s
s
V
o
l
u
m
e
\frac{Mass}{Volume}
V
o
l
u
m
e
M
a
ss
.
True
What are two common units for density?
kg/m³ and g/cm³
1 g/cm³ is equal to 1000 kg/m³.
True
What are two common types of measurement errors?
Systematic and random errors
Random errors occur predictably due to uncontrolled factors.
False