1. Density Notes Test – Thursday, 11/7 Textbook & Online Resources:
Chapter 8 – Lesson 1: Measuring Matter

2. Mass
The amount of matter in an object.

3. Mass Mass is measured in grams or kilograms.
The tools that you use for measuring mass are a triple-beam balance or a scale.

4. Weight
The force of gravity pulling down on an object.

5. On planet earth, an object’s weight is the same as its mass.
Weight = 6,000 kg
Mass = 6,000 kg

6. Ex: weight would change in space or on another planet
Earth = Weight = 6,000 Kg
However, an object’s weight can change, depending on the amount of gravity.
Ex: weight would change in space or on another planet
*Empty Space*
Weight = 2,262 Kg
Weight = 14,184 Kg
Weight = 0 Kg

7. Volume
The amount of space that is taken up by an object.

8. Volume
Volume is measured in cubic centimeters (cm3) or cubic meters (m3)
Volume of liquids is measured in milliliters (ml) or Liters (L)

9. Volume of a box Length X width X height = volume
4 cm
3 cm
8 cm
8cm X 3cm X 4cm = 96 cubic centimeters

10. Water Displacement
Used to find the volume of an irregular solid….like this toy dinosaur

11. Measure the water level with and without the dinosaur
***Difference in volumes = volume of the object!

12. water level with object – water level without object = volume of object

13. 77 – 47 = 30 cm3 Graduated Cylinder with out marbles10 20 30 40 50 60 70 80 90
100 10 20 30 40 50 60 70 80 90
100
Graduated Cylinder with out marbles
Cylinder with marbles
77 – 47 = 30 cm3

14. Density
The formula for density is D=m/v
OR Density = mass
volume

15. Don’t forget the formula for density, or you will break Mrs
Don’t forget the formula for density, or you will break Mrs. Szerdy’s heart! M V

16. If the object has a mass of 74 grams, and a volume of 8 cm3 What is the density?
74g/8 cm3 = 9.25 g/cm3

17. 2. If the object has a mass of 10 grams, and a volume of 20 cm3 What is the density?
10g/20 cm3 = 0.5 g/cm3

18. The Density Formula
Density
Volume
Mass X

19. If the object has a mass of 40 grams, and a volume of 5 cm3 What is the density?
40g/5 cm3 = 8 g/ cm3
M = 40
D = ????
V = 5 X

20. If the object has a density of 8 g/cm3 and a volume of 5 cm3, What is the mass???
8g/cm3 X 5 cm3 = 40 g
M = ????
D = 8 X
V = 5

21. If the object has a mass of 40 g and a density of 8 g/cm3, what’s the volume?
40g g/cm3
= 5 cm3
M = 40
D = 8
V= ???? X

22. 3. If the object has a density of 2 g/cm3 and a volume of 10 cm3, What is the mass?
2 g/cm3 x 10 cm3 = 20 g

23. 4. If the object has a density of 0
4. If the object has a density of 0.5 g/cm3 and a volume of 25 cm3, What is the mass?
0.5 g/cm3 x 25 cm3 = 12.5 g

24. 5. If the object has a mass of 60 g and a density of 3 g/cm3, what’s the volume?
60g / 3 g/cm3 = 20 cm3

25. 6. If the object has a mass of 150 g and a density of 5 g/cm3, what’s the volume?
150g / 5g/cm3 = 30 cm3

26. Density is measured in grams per cubic centimeter = g/cm3
If something has a density of 10 g/cm3, that means that 1 cm3 of the substance would weigh 10 grams.

27. Density is how heavy something is in relationship to its size.

28. Density Gizmo – predict float or sink

29. A small object can have high density.
Ex: a coin is heavy for its size and will sink in water.

30. A small object can have low density.
Ex: a balloon is light for its size and will float in water or air.

31. A large object can have high density.
Ex: a boulder is very heavy for its size and will sink in water.

32. A large object can have low density.
Ex: an elephant is less heavy for its size and will float in water.

33. ***The density of water = 1***
Objects with a density of less than 1 float in water
***The density of water = 1***
Objects with a density of more than 1 sink in water

34. Will it float?
Mass = 52 g
Volume = 35 cm3
52g / 35 cm3 = 1.48 g/cm3

35. Will it float? Mass = 270 g Volume = 317 cm3
270g / 317 cm3 = 0.85 g/cm3

36. Will it float?
Mass = 4 g
Volume = 10 cm3
4g / 10 cm3 = 0.4 g/cm3

37. A material’s density can be used to identify it.
The density of gold is 19.3 g/cm3
Which of the following substances is gold?
Rock A
Mass = 108 g
Volume = 12 cm3
Rock B
Mass = 126 g
Volume = 15 cm3
Rock C
Mass = 386 g
Volume = 20 cm3
108g / 12 cm3
= 9 g/cm3
126g / 15 cm3
= 8.4 g/cm3
386g / 20 cm3
= 19.3 g/cm3

38. Find the density of these 3 pieces of gold
Small Piece of Gold
Mass = 386 g
Volume = 20 cm3
Medium Piece of Gold
Mass = 1158 g
Volume = 60 cm3
Large Piece of Gold
Mass = 5018 g
Volume = 260 cm3
386g / 20 cm3
= 19.3 g/cm3
1158g / 60 cm3
= 19.3 g/cm3
5018g / 260 cm3
= 19.3 g/cm3

39. A material’s density is always the same
A material’s density is always the same! It does NOT change with its size.
All samples of gold have the same density!!! It does not matter how large the piece is.