1. Density Notes
EQ: What is density?

2. A. Mass Measured in grams (g) Mass vs weight
Depends on the attraction of gravity
matter in the object

4. B. Volume Measured in cm3, mL, L, …
Amount of space taken up by an object

5. Ways to Find Volume
Measuring distance and use an equation

6. Ways to Find Volume 2. Water Displacement
(Final volume – Initial volume)

7. Archimedes Principle https://www.youtube.com/watch?v=ijj58xD5fDI
After immersion
Fishing sinker
98.5 cm3
Thread
Vfinal = 98.5 cm3
- Vinitial = 44.5 cm3
Vfishing sinker = 54.0 cm3
Before immersion
Water
44.5 cm3
Archimedes Principle: water displacement method to find the volume of an irregularly shaped object.
The volume the water level increased is equal to the volume of the submerged object.
The most famous application of buoyancy is due to Archimedes of Syracuse around 250 BC. He was asked to determine whether the new crown that King Hiero II had commissioned contained all the gold that he had provided to the goldsmith for that purpose; apparently he suspected that the smith might have set aside some of the gold for himself and substituted less-valuable silver instead. According to legend, Archimedes devised the principle of the “hydrostatic balance” after he noticed his own apparent loss in weight while sitting in his bath. The story goes that he was so enthused with his discovery that he jumped out of his bath and ran through the town, shouting "eureka" to the bemused people.

8. You Try
Initial
Final
68.0 mL
64.0 mL

9. You Try
4.0 mL
Final – Initial = _______
68.0 mL mL
4.0 mL

10. C. Density
Mathematical Definition: amount of mass in a given volume

11. C. Density
Particle Definition: A measure of how tightly spaced matter is

12. C. Density
Density is a physical property that can be used to identify a substance
Substance
Density (g/mL)
Aluminum
2.70
Titanium
4.54
Zinc
7.13
Tin
7.31
Iron
7.87
Nickel
8.90
Copper
8.96
Silver
10.50
Lead
11.35
Mercury
13.55
Gold
19.30

13. D. Density Practice
A piece of metal with a mass of 1.58 grams was placed into a graduated cylinder filled with ml of water and the water level rose to ml.

14. Problem solving in Chemistry
GUESS
G- Givens
U- Unknowns
E- Equation
S- Substitute
S – Solve
Don’t forget to round your answer to the correct number of significant Figures

15. D. Density Practice D = m V D =
A piece of metal with a mass of 1.58 grams was placed into a graduated cylinder filled with ml of water and the water level rose to ml. Calculate the density and identify the metal.
Givens Work
m = 1.58 g
D = m
V =
25.87 mL V mL
D =
1.58 g
0.22 mL
= g/mL
0.22 mL
D = ?
= 7.2 g/mL
identity?

16. D. Density Practice D = m V D = Substance Density (g/mL) Aluminum 2.70
Titanium
4.54
Zinc
7.13
Tin
7.31
Iron
7.87
Nickel
8.90
Copper
8.96
Silver
10.50
Lead
11.35
Mercury
13.55
Gold
19.30
Givens Work
m = 1.58 g
D = m
V =
25.87 mL V mL
D =
1.58 g
0.22 mL
= g/mL
0.22 mL
D = ?
= 7.2 g/mL
identity?
Zinc

17. D. Density Practice D = m D V = m 1 V 1 m =
A substance has a density of 4.50 g/cm3. What is the mass of 6.00 cm3 of this substance?
Givens Work
D = 4.50 g/cm3
D = m
D V = m 1
V = 6.00cm3 V 1
m = ?
m =
4.50 g/cm3
6.00cm3 x
= 27 g
= 27.0 g

18. Density Practice D = m V = ? ___ 1 v V = m D D V = m ___ D ___ D
A substance has a density of 5.38 g/cm3. What is its volume if the total mass of the sample is 2.33 g? Rearrange the equation to solve this problem.
D = m
V = ?
___ 1 v
V = m D
D V = m
___ D
___ D

19. Density Practice D= m= V= D = m V = m D 1 V 1 D V =
A substance has a density of 5.38 g/cm3. What is its volume if the total mass of the sample is 2.33 g?
Givens Work D= m= V=
D = m
V = m D 1
5.38 g/cm3 V 1 D
2.33 g
= cm3
2.33 g
V =
5.38 g/cm3
=0.433cm3 ?