1. L.O: students will be able to explain what density is & how to calculate density of objects.
Do now (5 minutes): (take the notes!!!)
A metallic silver cube has a mass of: 38.0 g
And a volume of 5.0 cm3.
calculate its density? (hint: use ESRT page 1 )
identify the mineral? (hint: use ESRT page 16)

2. Do now: calculating the density of an unknown mineral
mass
38.0 g
7.6 g/cm3
Density = = =
5.0 cm3
volume
The mineral is: galena
Which mineral is it?
Hint: look on pg 16 of your ESRT

3. Density is like the “thickness” of a substance.
Density is The quantity of matter in a certain volume of space.
A property that combines mass and volume
Measures how tightly packed the particles are
Unit – g/cm³ (for solids) or g/mL (for liquids)

4. Which is more dense? A B

5. Which is denser (“thicker”) marshmallows or rocks?

6. Density = mass volume D=M V
Density Formula
Density = mass volume D=M V

7. Do you remember? What is mass?
Mass (the amount of matter an object is made of) is measured on a triple beam balance. In grams, kilograms..
What is Volume?
The amount of space an object takes up
Unit – cm³ (for solids) or mL (for liquids)
{note: 1cm³ = 1mL}

8. How do we find Volume of a cube?
volume of a cube: volume = L x W x H
How do we find Volume of a cube?

9. How would you find the mass of this rock?

10. Find the mass using a triple beam balance!!!!

11. water displacement is used to find the volume of irregular shaped objects.

12. What is this man’s volume?
His volume is 1.6 milliliters (1.6 cm3) because that’s how much water he displaced.

13. What is the water’s volume here?
5.6 ml
4.8 ml

14. the dinosaur’s volume: 5.6 ml- 4.8 ml = 0.8ml (0.8 cm3)

15. Density does not depend on the size and shape of the material.

16. ex: The density of Galena (lead) is always 7
ex: The density of Galena (lead) is always 7.6 g/cm3, no matter the shape!!!
7.6 g/cm3
7.6g/cm3
7.6 g/cm3
7.6 g/cm3
7.6
G/cm3
7.6 g/cm3

17. The density of a substance won’t change, even if we alter the size
7.6 g/cm3
7.6g/cm3
7.6 g/cm3
7.6 g/cm3

18. The density of a substance can be represented on a graph
Mass
(g) 80 60
What is the density of this substance? 40 20 10 30 20 40
Volume (cm3)

19. The denser the substance, the steeper the slope of the graph
Mass
(g) 80
4.0g/cm3
2.0g/cm3 60 40 20 10 30 20 40
Volume (cm3)

20. The density of a substances only changes if we change the phase of matter

21. What are the three phases of matter?
Solid, liquid and gas

22. solid is most dense phase. Liquids: is second . Gases: least dense
For most substances:
solid is most dense phase.
Liquids: is second .
Gases: least dense
Water is “weird”!!!!!

23. Liquid water is more dense than ice (“solid” water).
Water has its greatest density, when it is a liquid at 4 degrees celsius.

24. A substance’s density is why it floats (or sinks) in water
A substance’s density is why it floats (or sinks) in water. Ice floats in water because it is LESS dense than water.

25. The density of water: 1.0 g/ml

26. If density is less than 1. 0g/cm3 it floats. If density is more than 1
If density is less than 1.0g/cm3 it floats. If density is more than 1.0g/cm3 it sinks.
.60g/cm3
0.90g/cm3
.75g/cm3
1.0g/cm3
1.5 g/cm3

27. Factors affecting the density…
1. Pressure: as pressure increases, density increases.
(Direct relationship)

28. This is what makes a lava lamp work!
2. Temperature: as temperature increases, density decreases. (Inverse relationship)
This is what makes a lava lamp work!

29. When measuring, we are not always exact
When measuring, we are not always exact. To see how far off our measurements are we use the percent deviation formula found on the cover of our ESRTs.

30. X 100 Percent Deviation (Error) =
Difference between measured and accepted value
Accepted value
X 100

31. A student measured the density of an object to be 27
A student measured the density of an object to be 27.3 g/cm3 when its actual density is 28.1g/cm3. What is this student’s percent error?
Formula: Formula with numbers:
Solve