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2.4 Density _ 2
Planning
Homework
Revision previous lessons
Explanation 2.4
Let's work
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Slide 1:
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Natuurkunde / Scheikunde
Middelbare school
havo
Leerjaar 2
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Planning
Homework
Revision previous lessons
Explanation 2.4
Let's work
Slide 1 - Diapositive
Homework
Any questions?
Slide 2 - Diapositive
You determine the mass with a ...
A
ruler
B
protractor
C
scale
D
measuring cilinder
Slide 3 - Quiz
149.56 g = ... kg
A
149.256 kg
B
1.49256 kg
C
142.56 kg
D
0.149256 kg
Slide 4 - Quiz
How do you determine the Volume of an object?
Slide 5 - Question ouverte
The formula for calculating the volume of a cylindrical object is:
A
V
=
π
⋅
2
r
⋅
h
B
V
=
π
⋅
d
2
⋅
h
C
V
=
π
⋅
r
2
⋅
h
D
V
=
π
⋅
(
r
⋅
r
)
⋅
h
Slide 6 - Quiz
Here you see the immersion method, where the volume of a stone is determined.
What is the Volume of this stone?
A
2
4
c
m
3
B
1
5
c
m
3
C
9
c
m
3
D
3
9
c
m
3
Slide 7 - Quiz
45 dm³ = ... L
A
4.5L
B
45L
C
450L
D
45000L
Slide 8 - Quiz
Explanation
Density
= property ...
= is a physical and chemical quantity (variable) that expresses how much mass of that substance is present in a given volume.
The mass (in grams) of 1 cm
3
of a substance.
Every substance with a volume of 1
cm
3
has a different mass...
Slide 9 - Diapositive
Slide 10 - Diapositive
Explanation
Aluminum
Density of 2,70 g/cm
3
You pronounce this as: 2.70 grams per cubic centimeter.
If you take 1
cm
3
aluminum and place it on a scale, the scale will indicate 2.70 grams
Slide 11 - Diapositive
Explanation
Caltculate the Density:
Slide 12 - Diapositive
Explanation
Caltculate the Density:
Slide 13 - Diapositive
Explanation
Caltculate the Density:
ρ
=
V
m
Slide 14 - Diapositive
Explanation
Caltculate the Density:
ρ
=
V
m
Variable
Symb.
Unit
Symb.
Density
(rho)
gram per cubic centimeter
g/
Mass
m
gram
g
Volume
V
cubic centimeter
ρ
c
m
3
c
m
3
Slide 15 - Diapositive
What will happen when you put a brick into water?
A
It sinks
B
It hovers
C
It floats
Slide 16 - Quiz
What will happen when you put 'normal' wood into water?
A
It sinks
B
It hovers
C
It floats
Slide 17 - Quiz
Why does a brick sink and wood float?
Slide 18 - Question ouverte
Explanation
Sinking / Hovering / Floating:
Sinking: The substance that sinks has a bigger density
Hovers: The density of the substances are equal.
Floating: The substance that floats has a smaller density
Slide 19 - Diapositive
Explanation
Density of water = 1 g/cm
3
If density > 1 g/cm3 -->
It sinks
If density = 1 g/cm3 -->
It hovers
If density < 1 g/cm3 -->
It floats
Slide 20 - Diapositive
Describe in your own
words what density means
timer
0:45
Slide 21 - Question ouverte
Does the mass of an object affects if it sinks, hovers and floats?
A
No
B
Yes
Slide 22 - Quiz
Which liquid has the ...
lowest density
highest density
Slide 23 - Question de remorquage
Let's work
Now:
- Read §2.4
- Make §2.4 - exercise.: 36, 37, 39, 40, 45
Slide 24 - Diapositive
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